628 Dr. A. C. Stokes on some 



LXVII. — Some new Forms of American Rotifera. — II. 

 Bv Dr. Alfred C. Stokes. 



[Plate XIV.] 



The followinir presumably undescribed Kotifera were all 

 taken from a sliallow clear-water pool in a rocky wood near 

 Trenton, New Jersey, U.S.A. 



Notommata vorax, sp. n. (PI. XIV. figs. 1-3.) 



Elongate, subcylindrical, exceedingly soft, flexible, and 

 changeable ; ventral sui-face flattened ; integument often 

 thrown into numerous irregularly longitudinal folds ; front 

 rounded, but exhibiting in side view a short curved proboscis 

 similar to that of Taphrocampay and visible in dorsal or in 

 ventral aspect as a narrowly semicircular appendage ; body 

 somewhat tapering posteriorly ; tail represented by a short 

 inconspicuous semicircular projection ; foot short, oblong, 

 changeable ; toes short, robust, conical, excentrically acumi- 

 nate ; cilia entirely prone ; auricles conspicuous, subcylin- 

 drical, surrounded by a hyaline subspherical membrane 

 bearing the long cilia ; dorsal antenna a single minute seti- 

 gerous fossa; lateral antennse not observed; brain large, 

 extending to or beyond the raastax, the posterior extremity 

 opaque, a single red eye placed at the front of the granular 

 mass; tropin forcipate, protrusible ; oesophagus long, con- 

 spicuous, irregularly annulate, or sometimes apparently twisted 

 and cord-like ; gastric glands present, multinucleate ; stomach 

 and intestine not difi'erentiated from each other; ovary ventrad 

 to the intestine; contractile vesicle subspherical, near the 

 posterior extremity ; foot-glands two, but apparently accom- 

 panied by two or more smaller glands ; movements vermicular, 

 except when swimming by the aid of the auricles, wiien the 

 motion is often rotary on the longitudinal axis ; posterior 

 body-region imperfectly retractile, the toes not being with- 

 drawn entirely into the body. 



Length about -f^,,^ inch. 



Habitat as mentioned at the head of this j)aper, as is that 

 of all the following forms. 



This seems to be a delicate creature, but its voracious 

 a])petite is amusing. I have noted several specimens with 

 the intestinal canal distended by a long unbroken filament of 

 alga [Oscillntoria) bent upon itself and in the process of 

 digestion. In a single instance 1 have observed a similar 



