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IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
*CoIpoda cucullus Ehr. 51, figure 56. 
Shape reniform, compressed laterally. Mouth ventral in a 
deep depression, the animal, however, ■ frequently swimming on 
its side with the mouth on the right margin. Pharynx dilated 
at the lower end into a globular pit. Surface deeply grooved, 
the lines following the curved outline of the body until they 
reach the anterior end where they form crenulations on the 
right lateral margin anterior to the mouth. Nucleus central, 
beside the dilated end of the pharynx. Vacuole posterior. En- 
doplasm packed with dense granules. Common in ponds. Length 
60 microns. 
*Strombidmm species. 52 and 53, figure 56. 
This genus is described as like II alter la but without the jump- 
ing bristles, and having the anterior portion protrusible. A 
large culture w T as obtained from pond water in which the form 
figured in 53 was common. There were, however, one or two 
specimens found which had a circlet bf long weak hairs, occu- 
pying the position of the jumping bristles of Ilalteria. How- 
ever, the much greater size, the plastic body, protrusible ante- 
rior portion, swollen lateral vacuole, and absence of springing 
motion, seem sufficient for taking both these forms from the 
genus Ilalteria. They were found associated with Stent or but 
did not long survive laboratory conditions. Size 60 to 80 mi- 
crons. 
Subclass SUCTORIA. 
*Podophrya maupasii Butschli. 54 and 55, figure 57. 
Pedicel cylindrical, rather thick, slightly curved, enlarging 
at the summit. Body subspherical or club shaped, concave at 
the base for insertion of stalk. About twelve heavy tentacles 
slightly longer than the body, not conspicuously capitate. (Fun- 
nel shaped and not exceeding the diameter of the body, accord- 
ing to the Monographiquh sur le groupe des Inf usoires Tenia- 
culiferes of Sand. ) Cytoplasm bluish gray, nucleus central ; 
vacuoles two. Length 42 microns. Found in goldfish tank in 
winter. 
*Podophrya libera Perty. 56, figure 57. 
Only the characteristic annulated cyst of this species was 
found in some pond water, and as it did not revive there is a 
question involved in the identification. My opinion is that it is 
