1887.] -"51 [Stokes. 



Thuricolo^piis innixa. Fig. 16. 



Thuricola innixa Stokes. Am. Monthly Micros. Journ., Oct., 1882. 



Lorica subcylindrical, sessile, from four to five times as long as broad, 

 somewhat attenuate posteriorly, the base of attachment truncate ; the 

 frontal border even, sometimes slightly everted ; bearing internally, at 

 some distance from the orifice, a valve-like appendage as in Thuricola 

 vaUata, and an opposite, rigidly attached but distally flexible membranous, 

 setiform organ projecting arcuately inwards, and acting as a support to 

 the descended valve, the wall of the lorica being inflated immediately be- 

 hind this bristle-like valve-rest ; enclosed animalcule pedicellate, project- 

 ing, when extended, one-third of its entire length beyond the lorica aper- 

 ture. Length of lorica, jJ-y inch. Hub. — Pond water ; attached to 

 various aquatic plants. 



Thuricolopsis KelUcottiana, sp. nov. Fig. 17. 



Lorica subcylindrical, sessile, less than four times as long as broad, the 

 posterior region tapering, attenuate, subcylindrical and forming about one- 

 eighth of the entire length ; frontal border slightly everted ; posterior ex- 

 tremity truncate; valve and bristle like support essentially as in Th. 

 innixa, the lorica wall not inflated behind the valve- rest ; enclosed ani- 

 malcule, when extended, long and attenuate, about one-fourth of its length 

 projecting beyond the lorica aperture ; pedicle filiform, from one sixth to 

 one-seventh as long as the lorica ; cuticular surface smooth ; two zooids 

 frequently occupying the same sheath ; nucleus extremely long, narrow 

 and undulate ; endoplasm granular ; contracted body elongate obovate. 

 Length of lorica, yj-j- inch. Hab. — Pond water ; attached to various 

 aquatic plants. 



This form was first observed by Prof. D. S. Kellicott attached to aquatic 

 plants, at Corunna, Mich. {Pi^oc. Amer. Soc. Micros., JSS4), and by him 

 referred to as a variety of T/i. innixa. It occurs sparingly in the writer's 

 locality in New Jersey, and seems sufficiently distinct to merit a specific 

 title and place. 



Platycola calochila, sp. nov. Fig. 18. 



Lorica broadly ovate, becoming brown with age, less than three times 

 as long as broad, dorsal surface convex ; posterior extremity rounded, the 

 anterior obliquely rounded or truncate, produced as a very short, vertical, 

 neck-like prolongation, the margins slightly everted, the aperture trans- 

 versely oval or subelliptical, laterally prolonged toward the ventral aspect, 

 presenting, in lateral view, the appearance of a deep, rounded excavation ; 

 zooid, when extended, protruding for a considerable distance beyond the 

 aperture ; nucleus long, narrow, band-like. Length of lorica, ^\^ inch. 

 JIab. — Pond water; attached to the rootlets of Lemna. 



