72eio Forms of American Botifera. 629 



thread of Oscillatoria bj the Rotiferon's deliberate forward 

 movement thrust through the mastax, the oesophagus, and 

 the rest of the alimentary canal, until it impinged upon the 

 posterior intestinal wall, where the resisting pressure turned 

 the alga upon itself, when the upper free end slipped into the 

 stomach. 



This Rotiferon is, in my opinion, not a Notommata, but I 

 place it in that genus for present convenience ; neither do I 

 think that Taphrocampa clavigera^ mihi*, is a member of 

 that genus, in which I have placed it for the same reason. 

 When our American Rotifera are monographed in the future, 

 a new genus will probably be needed to receive both these 

 forms, with Taphrocampa clavigera as the type. There are 

 others in our American waters closely allied to these, antl 

 sufficiently distinct to merit specific rank, but agreeing 

 neither with Taphrocampa nor with Notommata as at present 

 diagnosed, yet resembling both in some features, as do the 

 two forms here mentioned. 



Proales hyalina, sp. n. (PI. XIV. fig. 4.) 



Irregularly obconical, entirely transparent ; dorsum arched, 

 the ventrum somewhat flattened, the pectoral region beneath 

 the mastax forming a conspicuous rounded projection; corona 

 obliquely transverse and prone ; coronal cilia of two kinds, 

 those of the pectoral region large, long, vigorous, and appa- 

 rently limited to a single series, the others shorter, fine, and 

 delicate ; dorsal antenna single, with but few long stout 

 setae ; lateral antenna conspicuous, each with one or two 

 long stout setie and several smaller radiating hairs ; foot 

 long, stout, tapering to the two short acute conical toes ; 

 brain irregular, not large, apparent!}'- suspended by several 

 anterior nervous prolongations, and by the large nerves to the 

 antennae ; eye single, red ; mastax large, surrounded ante- 

 riorly by a collection of small subspherical bodies, apparently 

 forming a glandular mass ; two or more small pyriform 

 salivary glands attached posteriorly to the mastax near the 

 origin of the long strongly ciliated oesophagus ; gastric glands 

 subspherical, at the frontal shoulder of the stomach, which, 

 with the intestine, is lobulated, especially when empty ; anal 

 orifice in a conspicuous dorsal projection ; ovary ventrad to 

 the stomach and the intestine; contractile vesicle small, 

 ventrad to the intestine ; lateral canals and the flame-cells 

 chiefly limited to tlie ventral region, only a single flame-cell 

 having been observed elsewhere, this being above the mastax ; 



* Ann. & Map:. Nat- Hist., July 1896. 



