STOMATOPHORA. 71 



Dimensions. — Maximum size of trophozoite ISO/a by ISO^u,, 

 average 80 ju, by 60 |U, ; gametocysts measure 60-70 ^ by 

 50-60 IX ; sporocysts 9-11 ^u by 5-6 jx and 7-7-5 ju. by 3 ft. 



Remarks. — The organism exhibits active though by no means 

 rapid movements of the body, thus causing alterations in 

 form from moment to moment. The body is generally 

 expanded at the anterior end so as to look like a top or a flower- 

 vase. It may then show a constriction round the middle of 

 the body and assume an hour-glass-like shape, and later a more 

 regular outline again. In 1924 I studied the structure of the 

 sucker and the crown of petals, and amended the diagnosis 

 of the species as given by Hesse (1909). 



There is generally a smaU difference in size between the 

 gametocytes enclosed in a cyst, but the gametes do not show 

 anisogamy. 



Habitat. — Seminal vesicles of Pheretima barbadensis (Bed- 

 dard) : Punjab, Lahore. 



16. Stomatophora diadema Hesse. (Fig. 18.) 



Stomatophora diadema, Hesse, 1909, pp. 187—9, pi. ii, figs. 66-8. 

 f Stomatophora diadema, Bhatia, 1924, pp. 503-7, pi. xxiii, figs. 26—31. 



Stomatophora diademxi, Cognetti, 1925, p. 233 ; Bhatia, 1929, p. 125. 

 "f Stomatophora sp., Ray & Chatterjee, 1936, p. 345. 



Trophozoite with the form of a sphere flattened and com- 

 pressed between its two poles, so as to resemble a plate or 

 disc marked by furrows and divided into a number of irregular 

 lobes, some of which are considerably larger than others. 

 The sucker is a shallow-like cup depression in the centre of 

 the body, and shows a central conical projection or mucron. 

 Nucleus generally rounded, sometimes oval, eccentric in posi- 

 tion, with a large karyosome. Gametocysts usually spherical. 

 Sporocysts navicular, with extremities rather drawn out and 

 truncated at the ends. 



Dimensions. — ^Maximum size of trophozoite 105 fx ; gameto- 

 cysts 125-170 jjL in diameter ; sporocysts 8-12 /x by 3-4 jx. 



RemarJcs. — In 1924 I discussed the morphology of the 

 sucker in S. simplex, S. coronata, and S. diadema, and came 

 to the conclusion that, unlike the epimerite of the Polycystid 

 Gregarines, the sucker is not present in the earlier stages of 

 development in any of the species of Stomatophora, and that 

 during the growth of the trophozoite a simple cup-hke sucker 

 is formed by a flattening and inpushing of the anterior end of 

 the body, the median projection or mucron being thus carried 

 to the bottom of the cup-like depression. This process would 

 seem to cause the epicytal striations to appear first on the 

 surface of the sucker and extending from the central mucron 

 to certain definite points on the circular border of the aperture ; 



