152 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Genus Coleps Ehrenberg. 



Body persistent in form, more or less barrel-shaped, but not always 

 symmetrical. Surface covered by an armor of plates arranged around 

 the body in zones with cilia located in the intervening furrows. Mouth 

 terminal, surrounded by a row of cilia larger than those of the general 

 surface. Anal aperture posterior, subterminal. 



Coleps hirtus Ehrenberg. 



Body barrel-shaped, about twice as long as broad, truncated anteriorly, 

 rounded posteriorly. The mouth is surrounded by tooth-like processes, 

 and there are three spinous processes at the posterior end. Macronucleus 

 spherical, central or subcentral. Contractile vesicle single and posterior. 

 It divides along one of the softer transverse furrows and one half of each 

 new animal lacks, for a time, the armature, as shown in fig. 5, plate I. 



This is a very common form found in great abundance in pond water 

 arid old infusions, where it appears after most of the other forms of 

 Protozoa have disappeared. 



Size varies from 50 to 65 microns. Type specimen, 65 microns. (Figs. 

 5 and 9, plates XXXIII and XXXIV.) 



Genus Enchelydon C. & L. 



Body ovate or pyriform, elastic, and changeable in form. Anterior 

 end narrower but not prolonged into a neck-like process. Mouth terminal, 

 followed by a longitudinally striated membranous pharynx. Anus postevo- 

 terminal. 



Enchelydon farctus C. & L. 



Body ovate, about twice as long as broad, narrowed anteriorly and 

 usually slightly curved. Pharynx long, narrow and conspicuous. Mouth 

 terminal and projecting slightly beyond the surface of the body. Con- 

 tractile vesicle single, posterior. Macronucleus band-like, curved. Cilia 

 fine and short. 



This species was found in pond water which had been standing in the 

 laboratory for some time. 



Size usually given, about 200 microns. Size of type specimen, 180 

 microns. (Fig. 1, plate XXXIII.) 



Genus Prorodon Ehr. 



Body ovate, cylindrical, rounded at the extremities. Mouth terminal 

 or but slightly subterminal. Pharynx often reenforced by rod-like teeth. 

 Macronucleus spherical or elongated. Contractile vacuole single and pos- 

 terior. Ciliation complete. A longer tuft of cilia frequently present at 

 the posterior end. 



Prorodon teres Ehr. 



Body ovate, cylindrical, rounded at the extremities, about twice as 

 long as broad. Mouth terminal. Pharynx provided with rod-like teeth. 

 Macronucleus spherical or elongated. Contractile vacuole single and 

 posterior. 



This species is quite common in pond water after long standing. 



Length usually given, 150-200 microns. Length of type specimens, 

 115 microns. (Fig. 3, plate XXXIII.) 



