Stokes.] oO [April 18, 



must, willi the latter, be denied admission into the genus Litonotus, and 

 perhaps into the family Litonotidae. The forms differ from the typical 

 Litonotus in the absence of the neck -like prolongation, in the absence of 

 the rounded and often conspicuously elevated dorsum, and especially in 

 the position of the oral aperture, which in Litonotus is ventrally situated 

 near the base of the neck, while in Homalozoon it is exactly apical and 

 terminal. The Infusorian therefore formerly described by the writer under 

 the name of Litonotus vermicularis is here transferred to the generic group 

 now proposed for the reception of the two allied forms. 



Homalozoon vermiculare, Stokes. — Litonotus vermicularis, Stokes, Ann. 

 and Mag. Nat. Hist., Aug., 1887 ; Journ. Trenton Nat. Hist. Soc, Jan., 1838. 



Homalozoon flexile, sp. nov. — Body elongate, from twelve to fifteen 

 times as long as broad, widest centrally, tapering to the obtusely pointed 

 posterior extremity, and to a slight anterior constriction beneath the thick- 

 ened and obliquely rounded frontal border ; cilia short and fine, 

 arranged in longitudinal lines on the flattened ventral surface ; dorsal 

 aspect bearing numerous, minute, hispid seta? ; trichocysts within the fron- 

 tal extremity abundant and conspicuous, a few scattered throughout the 

 anterior region ; contractile vesicles from twelve to fifteen, arranged in a 

 series near one lateral border ; nucleus long, narrow, band-like, variously 

 curved; endoplasm usually granular. Length of body tis t0 xio inch. 

 Hab. — Pond water, with aquatic plants. 



This resembles Homalozoon vermiculare in contour, but differs in size, 

 in the number of contractile vesicles, and especially in the form of the 

 nucleus and the absence of a keel-like ridge traversing the dorsal aspect. 



EXPLANATION OF THE PLATE. 



Fig. 1 to 5. Various forms assumed by Mastigamceba reptans. 

 " 6. Heteromita fusiformis. 



"7. " with amoeboid protrusions. 



" 8. Heteromita triangularis. 

 " l) and 10. Two forms of Macromastix lapsa. 

 "11. Trachelomonas cervicula. An empty lorica. 

 " 12. Trachelomonas similis. 

 " 13. Trachelomonas obovata. 

 " 14. Trachelomonas spinosa. 

 "15. Epipyxis eurystoma. An empty lorica. 

 " 16. Epipyxis socialis. An empty lorica. 

 " 17. Cryptoglena alata. 

 "18. Furcilla lobosa. 

 "19. " " lateral view. 



" 20. " " a variety. 



"21. " " transverse optic section ; diagram. 



" 22. Lagenophrys bipartita. 

 " 23. Podophrya pusilla. 

 " 24. Solenophrya oblonga. 

 " 25. Solenophrya alata. 



