ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



63 



tractile vacuoles, as Biitschli observed in P. putrinum ; on Holophrya 

 indica sp. n., which has a main posterior contractile vacuole, and a 

 variable number (up to seven) of subsidiary vacuoles feeding it ; on 

 Lacrymaria vermicularis (Ehrbg.), with a single circlet of reflexed cilia 

 anteriorly, a single oval macronucleus, and a single contractile vacuole ; 



N 



<x^. 



5?7--c.v 



Lachrymaria vermicularis (Ehrbg.). 



2, fully extended ; 2a, moderately extended ; 26, fully contracted. 

 Full length 104 /x. N, macronucleus ; c.v., contractile vacuole. 



on a new subspecies of Loxophyllum fasciola^ with contractile vacuole 

 in two longitudinal rows ; and on other forms. J. A. T. 



Ingestion of Erythrocytes by a Monad associated with Dysentery. 

 — F. G. Haughwout and W. De Leon {Philippine Journ. Sci., 1919, 

 14, 207-19, 1 pi). The Trichomonads found in the intestines of a 

 man include members of three genera — Trichomonas, Tetratrichomonas, 

 and Petitatrichomonas, with three, four, and five anterior flagella re- 

 spectively. All are equiped with an axostyle and an undulating 

 membrane bearing a marginal flagellum, which is continued beyond 

 the posterior end of the body as a free lash. On the basis of present 

 knowledge, the species of the first two genera seem to be lumen-dwelling 

 forms subsisting solely on bacteria. But the authors have shown that 

 Pentatrichomonas is adapted to the rather specialized diet of erythro- 

 cytes, and gives no evidence of being a bacteria eater. The actual 

 process of the ingestion of an erythrocyte was observed; many in- 

 dividuals contained an erythrocyte ; in no case was expulsion seen. The 

 inclusion of a red blood corpuscle in a Pentatrichomonas was reported by 

 Chatterjee in 1915. J. A. T. 



Fission in Trichomonads. — Charles A. Kofoid and Olive 

 SwEZY {Proc. Amer. Acad. Arts and Sciences, 1915, 61, 289-364, 8 pis., 

 7 figs.). Mitosis and multiple fission occur during periods of great 

 amoeboid activity of the Trichomonads in the mucus of the intestinal 

 epithelium. Mitosis is premitotic with the nuclear membrane intact 



