Marine Protozoa from Woods Hole | Page 4

were not seen. The single specimen that I found looked much like a Suctorian of the genus Sph?rophrya, but the absence of a firm cuticle and the presence of food-taking pseudopodia with granule-streaming makes it a very questionable Suctorian, and 1 place it here until further study throws more light upon it.
Diameter of body 40��; length of pseudopodia 120 to 140��.
[Illustration: Fig. 5.--Actinophrys sol.]

Genus HETEROPHRYS Archer.
The body is globular with but slight differentiation into ectoplasm and endoplasm; one nucleus in the latter; contractile vacuoles one or many; pseudopodia on all sides, thin, and with peripheral granule-streaming; surrounded by a globular, rather thick coat of jelly, which is hyaline inside and granular on the periphery. Fresh and salt water.
Heterophrys myriapoda Archer. Fig. 6.
Synonym: H. marina Hert. & Less. '74.
Diameter 25 to 80��; pseudopodia twice as long as the body diameter; the plasm often contains chlorophyll bodies (Zoochlorella). The granular part of the gelatinous layer is thick (up to 10��). The spine-like processes are very thin and short. (Schaudinn '95.) The marine form found at Woods Hole probably belongs to this species, as described by Schaudinn. The short pseudopodia which give to the periphery a fringed appearance are quite regularly placed in connection with the pseudopodia. The latter are not so long as twice the body diameter, the longest being not more than equal to the diameter of the sphere. The body inside of the gelatinous covering is thickly coated with bright yellow cells similar to those on Radiolaria. The animal moves slowly along with a rolling motion similar to that described by P��nard '90, in the case of Acanthocystis. Diameter of entire globe 35��; of the body without the jelly 18��. The extremely fine granular pseudopodia are 8 to 35�� long. Common among alg?.
This form was probably meant by Peck '95, when be figured "a heliozo?n."
[Illustration: Fig. 6.--Heterophrys myriapoda.]
KEY TO ORDERS OF FLAGELLIDIA.
Small, body usually amoeboid; 1 or more Order MONADIDA. flagella; no mouth
Small; plasmic collar around the Order CHOANOFLAGELLIDA. flagellum
With 2 or more flagella; one trails Order HETEROMASTIGIDA. behind
With 3 or more flagella, none of which Order POLYMASTIGIDA. trails
Large; firm body wall; 1 or 2 flagella; Order EUGLENIDA. mouth or pharynx, or both
Medium size; with chlorophyll, Order PHYTOFLAGELLIDA. no mouth, usually colonial
Small; silicious skeleton; parasitic Order SILICOFLAGELLIDA. on Radiolaria or free (One genus, Distephanus St?hr)
KEY TO THE FAMILIES OF MONADIDA.
No mouth; 1 or 2 flagella: amoeboid Family Rhizomastigid? with lobose or ray-like pseudopodia
Mouth at base of single flagellum; Family Cercomonadid? plastic; no pseudopodia
One flagellum; inclosed in gelatinous Family Codonoecid? or membranous cups
One flagellum; tentacle like process Family Bikoecid? at base of flagellum; inclosed in cup
One main flagellum and 1 or 2 Family Heteromonadid? accessory flagella
KEY TO MARINE GENERA OF MONADIDA.*
Family Rhizomastigid?:
1. Flagellum repeatedly thrown off Genus *Mastigamoeba and reassumed in part
2. Flagellum never thrown off 3
3. a. Pseudopodia lobose Genus Mastigamoeba
b. Pseudopodia ray-like Genus Mastigophrys
Family Codonoecid?:
1. Goblet-shaped cups adherent Genus *Codonoeca by stalk
Family Heteromonadid?:
1. The long flagellum vibratory Genus *Monas
2. The long flagellum rigid; Genus Sterromonas shorter one vibrates
* Presence at Woods Hole indicated by asterisk.
KEY TO MARINE QENERA OF CHOANOFLAGELLIDA.
1. Without gelatinous 3 or membranous test
2. With gelatinous 4 or membranous test
3. a. Attached forms:
1. Without a stalk, or with Genus *Monosiga a very short one
2. With a long, simple, stalk Genus *Codonosiga
3. With a long, branched, stalk Genus Codonocladium
b. Free-swimming Genus Desmarella
4. Colonial, and with a gelatinous Genus Proterospongia covering
* Presence at Woods Hole indicated by asterisk.
KEY TO FAMILIES AND MARINE GENERA OF HETEROMASTIGIDA.
1. Two flagella nearly equal in size Family Bodonid?
One main and 2 accessory flagella Family Trimastigid?
Family Bodonid?:
1. Body very plastic, Genus *Bodo almost amoeboid
Body not plastic; with large Genus *Oxyrrhis anterior cavity, holding flagella
Family Trimastigid?:
1. With an undulatory membrane Genus Trimastix between accessory flagella
Without such membrane; flagella Genus Costia contained in a ventral groove while at rest
* Presence at Woods Hole indicated by asterisk.
KEY TO MARINE GENERA OF POLYMASTIGIDA.
1. Body flattened; ends rounded; Genus Trepomonas sides hollowed; often with wing-like processes; cross section S-shaped
2. Body pyriform; one large Genus Tetramitus asymmetrical groove; 4 flagella
3. Body spherical; many flagella Genus Multicilia equally distributed
KEY TO FAMILIES AND MARINE GENERA OF EUGLENIDA.
1. With deeply-insunk pharynx; 2 no mouth
With pharynx and distinct mouth Family Peranemid?
2. Body plastic; usually with Family Euglenid? chromatophores and eye-spot
Body plastic; no chromatophores; Family Astastid? no eye-spot
Family Euglenid?:
Body Euglena-like, inclosed Genus Trachelomonas in shell with round opening for exit of flagellum
Family Astastid?:
Body with one flagellum Genus *Astasia
Family Peranemid?:
1. Body striped; plastic; Genus Heteronema two diverse flagella
2. Body striped; not plastic; Genus *Anisonema posterior flagellum longer than the other
3. Body striped; not plastic; Genus Entosiphon with rod-like organ in pharynx
* Presence at Woods Hole indicated by asterisk.
Genus MASTIGAMOEBA F. E. Schultze '75.
(Kent '81; B��tschli '86; Klebs '92; Senn 1900.)
In general the form is oval and either regular in outline or irregular through the presence of many