RHYNCHOCYSTIS. 67 



Dimensions. — Maximum length. 400^ ; maximum width, 

 in shorter and thicker individuals, 50 jU,. 



Remarks. — This appears to be a rare parasite of its host, 

 being found only in a few specimens and in extremely small 

 numbers. The form of the trophozoite varies considerably ; 

 some are short and thick, while others are long and vermiform. 

 An epimerite is not found in all individuals, but, when present, 

 it is a distinct club-shaped structure, dilated at its distal 

 extremity and narrower at its base. The ectocyte is thin. 

 The entocyte is finely granular. The nucleus Hes more often 

 in the middle, though in some cases it is found to be situated 

 near the anterior end. It is oval in form, with its long axis 

 lying along the length of the parasite. The nucleus usually 

 measures 17-5 ^u. in its longer and 10-5^ in its shorter diameter, 

 and contains a single large eccentrically placed karyosome. 

 Some individuals show end to end syzygy ; sometimes the 

 satellite retains its epimerite and is fixed by it to the posterior 

 end of the primite. 



Habitat. — Seminal vesicles oi Pheretima elongata (E. Perr.) : 

 Bombay, Bombay. 



12. Rhynchocystis cognettii Bhatia & Chatterjee. (Fig. 14). 



'fJRhynchocystis cognettii, Bhatia & Chatterjee, 1925, pp. 190—3, pi. vii, 



figs. 1-10 ; pi. ix, figs. 22, 23. 

 Rhynchocystis cognettii, Bhatia, 1929, p. 125. 



Trophozoite with an epimerite. Shape of the body variable, 

 pear-shaped, spherical or gregariniform, and the anterior end 

 provided with a mucron surrounded by a crown of sarcocyte. 

 Hairs found only in the region of the mucron and sometimes 

 at the posterior end also. Nucleus generally spherical, with 

 a single spherical karyosome placed eccentrically and surrounded 

 by a clear white halo. The nucleus varies in its position, but 

 is never situated in the epimeritic region. Gametocytes are 

 nearly equal in size. 



Dimensions. — ^Maximum size of the trophozoite 129 ja by 

 46 jU. ; gametocysts are more or less ovoid and measure 

 up to 129 ju. by 81 |u,. 



Habitat. — Seminal vesicles of Allolobophora caliginosa 

 (Savig.) : Punjab, Kasauli. 



13. Rhynchocystis mamillata Bhatia & Setna. (Fig. 15.) 



^Rhynchocystis mamillata, Bhatia & Setna, 1926, pp. 370—1, pi. xii, 



figs. 21, 22 ; pi. xiv, figs. 32, 33. 

 Rhynchocystis mamillata, Bhatia, 1929, p. 125. 



Trophozoite with an elongate pear-shaped body, the 

 anterior end broader and provided with an epimerite consisting 

 of a nipple-shaped mucron surrounded at its base by a ring 



f2 



