Marine Protozoa from Woods Hole | Page 4

the freshwater forms. If I am
correct, however, in placing an Actinophrys-like form found at Woods
Hole in this species, the description will have to be somewhat modified.
In this form (fig. 5) there is no distinction between ectoplasm and
endoplasm, and there is an entire absence of vacuoles. The nucleus is
central, and axial filaments were not seen. The single specimen that I
found looked much like a Suctorian of the genus Sphærophrya, 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 40µ; length of pseudopodia 120 to 140µ.
[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 80µ; 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 10µ). 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 Pènard '90, in
the case of Acanthocystis. Diameter of entire globe 35µ; of the body
without the jelly 18µ. The extremely fine granular pseudopodia are 8 to
35µ long. Common among algæ.
This form was probably meant by Peck '95, when be figured "a
heliozoön."

[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 Stöhr)
KEY TO THE FAMILIES OF MONADIDA.
No mouth; 1 or 2 flagella: amoeboid Family Rhizomastigidæ with
lobose or ray-like pseudopodia
Mouth at base of single flagellum; Family Cercomonadidæ plastic; no
pseudopodia
One flagellum; inclosed in gelatinous Family Codonoecidæ or
membranous cups
One flagellum; tentacle like process Family Bikoecidæ at base of
flagellum; inclosed in cup

One main flagellum and 1 or 2 Family Heteromonadidæ accessory
flagella
KEY TO MARINE GENERA OF MONADIDA.*
Family Rhizomastigidæ:
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 Codonoecidæ:
1. Goblet-shaped cups adherent Genus *Codonoeca by stalk
Family Heteromonadidæ:
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 Bodonidæ
One main and 2 accessory flagella Family Trimastigidæ
Family Bodonidæ:
1. Body very plastic, Genus *Bodo almost amoeboid
Body not plastic; with large Genus *Oxyrrhis anterior cavity, holding
flagella
Family Trimastigidæ:
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;