Protozoa and Rotifera at Havana, III. 375 



Distyla Eckstein. 



Lorica of the form of a long ellipse, open and membranous 

 before, closed behind, depressed, higher before than behind ; 

 lateral inangulation feeble ; toes two ; selvage-like thicken- 

 ings of the lorica around the foot. 



62. D. gissensis Eckstein. 



Found but once, in a towing from Phelps Lake in July. 



63. D. ohioensis Herrick ('85). 



Excepting a rare occurrence in April, this species was 

 present only from July to November. It was found in Quiver 

 and Dogfish lakes. 



64. D. stokesii Pell ('90). 



Cathypna stokesii Pell * 

 This little species was found four times in towings from 

 Quiver Lake ; once in July, again in September and in Octo- 

 ber, and again in March. The entire surface of the lorica is 

 finely stippled. 



65. D. hornemanni Ehrbg. 



Occurred only in towings from Thompson's Lake, during 

 September. 



MONOSTYLA Ehrbg. 

 Like Cathypna, but with only a single toe. 



66. M. lunaris Ehrbg. 



This form was found in January and April, but principally 

 from June to November. It occurred upon vegetation and 

 in towings from the Illinois River, and from all the lakes 

 studied except Phelps Lake. 



67. M. cornuta Ehrbg. 



Taken in limited number among plants and in towings in 

 the Illinois River and in Quiver Lake, from July to October. 



Individuals have been observed nibbling and eating bits of 

 algfe, like the species of Euchlanis. 



68. M. bulba Gosse. 



This species was as abundant among the vegetation as in 

 the open water, and was found in all the bodies of water 



♦Jennings ('94) has pointed out that this species belongs to Distyla rather than 

 to Cathypna. 



