Stokes.] O [April 18, 



The species differs from all other known forms by the presence of the 

 internal tubular prolongation. It was collected in some abundance from 

 a sheltered pond in the early part of February, 1890. It is, therefore, 

 probably a vernal Infusorian. 



Trachelomonas similis, sp. nov. Fig. 12. Lorica oval or subelliptical, 

 nearly twice as long as broad, the extremities subequally rounded, the 

 surface irregularly and finely punctate, the aperture produced as an 

 obliquely directed neck-like prolongation, the margin oblique and irreg- 

 ularly denticulate ; color chestnut brown. Length of lorica inch. 

 Hab. Standing pond water, with aquatic plants. 



This approaches most nearly the T. lagenella (Ehr.) Stein, which is 

 described as colorless and entirely smooth, neither of which conditions 

 are observable in the present form. 



Trachelomonas obovata, sp. nov. Fig. 13. Lorica obovate, less than 

 twice as long as broad, the anterior border convexly truncate, the poster- 

 ior obtusely pointed ; surface minutely hispid, aperture slightly project- 

 ing, its margin rather more coarsely hispid ; color deep chestnut brown ; 

 flagella twice or more as long as the lorica. Length of lorica yr 1 ^ inch. 

 Hab. Standing water from the pools of early spring. 



Trachelomonas spinosa, sp. nov. Fig. 14. Lorica oval, about one and 

 one-third times as long as broad, both extremities equally and evenly 

 rounded, the entire surface clothed with slightly recurved spines, which 

 are largest at the posterior border ; the anterior aperture produced as a 

 short, smooth, truncate extension ; color brown f Length, exclusive of 

 the spinous processes, ^^ inch. Hab. Pond water, with aquatic plants. 



Epipyxis socialis, sp. nov. Fig. 15. Lorica elongate subcylindrical, 

 from eight to ten times as long as broad, often variously curved and bent, 

 the lateral borders nearly parallel, tapering posteriorly to the subacute 

 point of attachment, the anterior border truncate, usually not everted, 

 sometimes slightly flaring. Length of lorica 7 to 7 i 7 inch. Hab. 

 Pond water in early spring ; attached to Confervas. Social, occasionally 

 forming radiating, rosette-like clusters composed of fifty or more thecse, 

 or in irregular fascicles produced by the attachment of from eight to ten 

 loricae to a single supporting theca. 



The colonies formed by the attachment of one or more loricae to a single 

 theca as a basis of support, would seem to foreshadow the polythecium or 

 compound branching colony of Dinobryon, to which Epipyxis is closely 

 allied. Groups not rarely occur formed of from eight to ten thecae basal ly 

 attached to one and the same supporting lorica. 



Epipyxis eurystoma, sp. nov. Fig. 16. Lorica elongate-vasiform, about 

 three times as long as broad, widest at the anterior aperture, that orifice 

 flaring, constricted near the anterior border, widening subcentrally and 

 thence tapering to the subacute posterior point of attachment. Length of 

 lorica from -^ to rsW inch. Pond water, attached to various aquatic 

 plants. 



Cryptoglena alata, sp. nov. Fig. 17. Lorica obovate, colorless, less 

 than twice as long as broad, the anterior region widest, the frontal border 



