stokes.] *^*'-' [Nov. 2, 



Although Trachelomonas is probably not au infusorian, the following 

 descriptions are here included for convenience 



Trachelomonas fasiformis, sp. nov. (Pig. 4). — Lorica fusiform, three 

 times as long as broad, punctate with minute, scattered, conical ele- 

 vations which are larger and more conspicuous near the margin of the 

 posterior prolongation ; anterior region narrowed, neck-like, the frontal 

 border slightly everted, the margin minutely denticulate ; color brown. 

 Length of lorica, ^^- inch. Hah. — Pond water, near Trenton, N. J. ; 

 movements tremulous and rotary on the longitudinal axis. 



Trachelomonas sphcerica, sp. nov. (Fig. 5). — Lorica subspherical, 

 somewhat depressed, the anterior aperture produced into a short, 

 cylindrical, neck-like region, its frontal margin with four or more 

 obtuse denticulations ; entire surface of the lorica armed by long, con- 

 spicuous, obtuse spinous processes, the largest of which are subequal in 

 length to the length of the neck-like portion of the sheath ; color reddish 

 brown ; flagellum in length equaling or exceeding the circumference of 

 the lorica. Diameter, including the length of the spinous processes, ^^^ 

 inch. Hab. — Pond water, with Lemna, near Trenton, N. J. Movements 

 rapidly rotary. 



Trachelomonas acanthophora, sp. nov. (Fig. 6).— Lorica fusiform, 

 about twice as long as broad, the posterior region somewhat suddenly 

 contracted into a short, naked, punctate or smooth, prolongation, 

 terminated by three diverging spines ; anterior region produced as a neck- 

 like portion, naked and punctate or smooth, the anterior border truncate, 

 the margin bearing four or more radiating spines ; central or body-region 

 armed by numerous, conical, spine-like prolongations ; flagellum equaling 

 or exceeding the lorica in length ; endoplasm green. Length of lorica, 

 including spines, j^g inch ; width, without spines, about y^oo inch. Hah. 

 — Pond water, with Lemna, near Trenton, N. J. Movements rotary on 

 the longitudinal axis, 



Vaginicola longipes, sp. nov. (Figs. 7, 8). — Lorica trumpet-shaped, 

 much compressed, rather more than four times as long as broad, widest 

 and inflated near the middle third, thence tapering posteriorly to a 

 narrow, irregularly subcylindrical region forming from one-third to one-half 

 of the e«lire length of the lorica ; anterior border slightly everted, the 

 lateral margin somewhat constricted beneath the frontal region ; lorica 

 often irregularly constricted, the posterior, pedicle-like portion frequently 

 curved, and variously contorted, bent or irregularly inflated, the whole 

 becoming chestnut-brown with age ; enclosed animalcule adherent pos- 

 teriorly to a long, narrow pedicle apparently attached to the posterior 

 extremity of the lorica, but often there becoming indistinct, and at times 

 seemingly adherent to one lateral margin ; body soft and flexible, finely 

 striate transversely, extending slowly and irregularly, often undulate or 

 vermicular in form, the contracted anterior region bending posteriorly, 

 the flexure thus produced advancing towards the anterior aperture of the 

 lorica, the unexpanded peristomal region apparently wedged against the 

 lateral borders of the sheath, the animalcule thus remaining until another 



I 



