72 SPOBOZOA. 



later they extend beyond over smaller or larger portions of 

 the body. In S. simplex these striae do not extend beyond the 

 region of the sucker ; in S. coronata they extend over a small 

 area of the body immediately surrounding the sucker, thus 

 forming a crown of petals ; and lastly, in S. diadema they 

 extend not only over the whole of the body, but some of them 

 deepen and involve the deeper layers of the ectoplasm, 

 causing the body to be cleft into lobes. Ray and Chatter jee 

 (1936) have also studied the structure of the suckers of Stomato- 

 phora, but their detailed observations have not yet been 

 published. 



Habitat. — Seminal vesicles of Pheretima barbadensis (Bed- 

 dard) : Punjab, Lahore ; seminal vesicles of Pheretima 

 posthuma (L. Vaill.) : Bengal, Calcutta. 



4. Family ZYGOCYSTID^ Bhatia, 1930. 



Adult trophozoites always associated in pairs or groups of 

 three. Sporocysts biconical, octozoic. 



Genus EXTREMOCYSTIS Setna, 1931. 

 Extremocystis, Setna, 1931, pp. 206-9, pi. vi, figs. 2-6. 



Adult trophozoites elongate, resembling Nematocystis ; 

 always associated in pairs, attachment being end to end. 



17. Extremocystis dendrostomi Setna. (Fig. 19.) 



■\Extremocystis dendrostomi, Setna, 1931, pp. 206-9, pi. vi, figs. 2-6 ; 

 p. 325. 



The only known species in the genus. 



Adult trophozoites have the characters given above ; 

 attachment is brought about by one end of an individual 



Fig. 19. — Extremocystis dendrostomi Setna. (After Setna.) 



fitting into a concave depression of the other. Nucleus 

 ellipsoidal, greatly elongated, generally lying near that end 

 of the trophozoite which joins with the other trophozoite. 



