632 On some neio Forms of American Rotifera. 



pit ; lateral antennae small, on tlie ventral aspect of the lateral 

 inangulation, and almost concealed within the sulcus; frontal 

 and lateral borders of the iiead bearing a hyaline, flexible, 

 collar-like membrane or hood, folded together and withdrawn 

 into the lorica during the retraction of the animal ; brain 

 large, obscurely three-lobed posteriorly ; eye single, red, sub- 

 centrally placed on the nerve-ganglion ; gastric glands retort- 

 shaped ; stomach bearing internally an undulating membrani- 

 form appendage, which is in reality a tubular prolongation 

 similar to that of Floscidaria, Apsilus, and others ; foot 

 short, single-jointed, about as broad as long ; toes rod-like, 

 about as long as the greatest width of the lorica, each one- 

 shouldered and with a minute seta on the shoulder ; claws 

 acuminate, about one sixth the length of the toe. 



Total length, including toe, 0*015 inch ; width of lorica 

 and length of toes without foot 0"006 inch. 



Cathy pna glandulosa, ap. n. (PI. XIV, figs. 8-10.) 



Rotiferon large and robust ; lorica finely punctate ; frontal 

 borders almost even, the pectoral somewhat excavate between 

 the lateral pointed apices ; prolonged posteriorly as a broad, 

 rounded, evenly convex region ; toes long, rod-like, irregu- 

 larly constricted in front of the rectangular shoulder, each of 

 which bears a minute seta; claws about one third the length 

 of the toes, tapering to an acute point ; brain large, not lobed 

 posteriorly ; eye single, red, ])laced on the lower surface of 

 the nerve-ganglion, so that the light must pass to it from 

 above through the entire thickness of the ganglionic mass ; 

 gastric glands long, retort-shaped ; stomach bearing internally 

 an undulating apparently membraniform appendage, in 

 reality a long broad tube continuous with the oesopliagus ; 

 stomach and intestine usually in constant movement ; ovary 

 small when not functionally active, placed ventrad to the 

 intestine and on the left-hand side ; contractile vesicle large, 

 transversely placed in the median line near the posterior 

 border, the lateral canals plaiidy connected with it on each 

 side; tlamc-cells tlabelliform ; foot-glands six, geminate, the 

 three groups varying greatly in size and form ; lateral 

 antennaj not observed ; dorsal antenna single, apparently a 

 circular depression furnished with long setaj ana placed at 

 the gap of a central obconical incision in the hyaline hood, 

 which covers it during retraction. 



Length of lorica 7^*-, width j ,',,, inch; length of toes j ^g inch. 



The Rotiferon is remarkable for its large size and robust 

 character, but chiefly for the apparently superabundance of 



