1905.] NATURAL SCIENCES OF PHILADELPHIA. 671 



This is not more plentiful than T. cylindrica locally, and has not been 

 found by the writer in numbers sufficient for proper study. There is 

 room for doubt whether this is the organism described and figured by 

 Ehrenberg. Neither the lorica as observed nor Stein's figure resem- 

 bles Ehrenberg's figure xxiv, Taf. II, Infusionsthieren. Assuming, 

 however, for the present, an identity, T. lagenella Stein becomes T. 

 uchlora in accordance with known rules. 



Traohelomonas uroeolata Stokes. 



Trachelomonas urceolata Stokes. 1887. Proc. Amer. Philos. Soc. 



"Lorica vasiform, smooth, about twice as long as broad, the lateral 

 margins slightly flattened, produced anteriorly in a short, subcylin- 

 drical neck, the borders somewhat everted, truncate, not obhque; 

 posterior extremity not inflated, produced in an acuminate, tail-like 

 prolongation; endoplasm enclosing numerous, probably amylaceous, 

 corpuscles." 



Dr. Stokes gives the length of lorica in this remarkable species at 

 the equivalent of about 44/^, and the "habitat, pond-water." It has 

 been observed by the writer in some abundance in living condition in a 

 gathering from Riverton, New Jersey. It was accompanied by T. 

 volvocina, arniata and piscatoris. It differs remarkably from 

 familiar species of the genus in the proportionately wide aperture, and 

 in the thin, easily distorted, parchment-like lorica. The surface of the 

 lorica in these specimens was not smooth, but profusely tuberculate, 

 and the caudal process showed in some cases two or three appressed 

 setse. The material containing this form was made available through 

 the kindness of Mr. Edward Potts. 



Traohelomonas eurystoma Stein. 



Tradielomona^ eurystoma Stein. 1S7S. Infusion.sthiere, III. 



Lorica brown, broadly ovoid, obtusely pointed posteriorly, surface 

 entirely smooth. Aperture surrounded by a short, wide rim with 

 crenulated edge. Length 30 //.. 



Apparently rare in Delaware Valley. It has been observed, in num- 

 bers too small for proper study, in gatherings made in Tinicum. The 

 crenulation of the wide, shallow rim around the aperture is not always 

 evident. 



Trachelomonas torta Keilicott. 



Trachelomonas torta Keilicott. 1885. Proc. Amer. Soc. Micros. 

 "Egg-shaped colorless, ornamented by oblique rugosities, giving 

 the appearance of having been twisted; aperture situated in a short 

 oblique groove ; flagellum very long ; animalcule green, with red eye- 

 spot." 



