350 



MASTIGOPHORA AND PROTOMONADINA 



These species may be differentiated as follows :— 



A. Characters known to us 



I. Size large ; 20-25 microns in length : — - 



Flagella easily seen in cysts which resemble C mesnili 

 cysts in size and appearance — ■(!) Caulleryi. 



II. Size medium ; 11-18 microns in length : — 



[a) Cytostome long; cysts about 7x5-6 microns- in 



which the anterior flagella are difftcult to see- — ■ 

 (2) Mesnili. 



{b) Cytostome very short; cysts large, about 8x6 

 microns, in which the anterior flagella are very 

 distinct— (3) Bittencourti . 



III. Size small ; 7-12 microns in length : — 



{a) Nucleus with a central karyosome connected to the 

 blepharoplast by a rhizoplast; size 9-12 microns 

 in length — -(4) Caprce. 



(b) Nucleus without a central karyosome and without 



a rhizoplast; size 7-9 microns in length — 

 (5) Cuniculi. 



B. Characters unknown to its : — 



Found in species of Motella — (6) Motellce, 



Chilomastix mesnili Wenyon, 1910. 

 Synonyms. — {a) Cercomonas hominis Davaine, 1869, pro parte ■ 

 {b) Monocercomonas hominis Epstein, 1893, nec Grassi, 1879; (c) Tri- 

 chomonas intestinalis Roos, 1893, pro parte nec Leuckart, 1879; 



{d) Macrostoma mesnili Wenyon, 1910; {e) 

 Fanapepea intestinalis Prowazek, 191 1; (/) 

 Tetramitus mesnili Brumpt, 1912 ; (g) Difdmus 

 tunensis Gabel, 1914; [h) Cyathomastix hominis 

 Prowazek and Werner, 1914; (i) Tetramitus 

 bocis Brumpt, 1912 ; (k) Chilomastix intestinalis 

 Kuczynski, 1914. 



Definition. — Chilomastix of medium size, 

 with long cytostome and with cysts about 

 7x5-6 microns, in which the anterior flagella 

 are difficult to see. 



Historical. — ^This flagellate appears to have 

 been first noted by Davaine in i860, being 

 called Form A of Cercomonas hominis. After 

 this it was noted by Roos in 1893, and by 

 Epstein in the same year. It was rediscovered 

 and properly described by Wenyon in 1910, 

 and later noted by Prowazek in 191 1, Nattan- 

 Larrier in 1912, Brumpt in 1912, Gaebel in 

 1914, Chatterjee in 1915, Wenyon in 1915, Da Fonseca in 1915 and 

 1916, Fantham and Porter in 1915, Archibald, Hadfield Logan, and 

 Campbell in 1916, Wenyon and O'Connor in 1917, Castellani in 1917, 

 and Chalmers and Pekkola in 19 18. 



Fig. 77. — Chilomastix 

 mesnili Wenyon 

 1910. 



Note the membrane 

 raised by the cyto- 

 stomic flagellum. 



