64 SPOROZOA. 



as to produce constrictions and bulgings, giving it the same 

 appearance as N. magna and N. plurikaryosomata. The 

 opacity of the granular cytoplasm is so great that the nucleus 

 is only faintly indicated. 



In the stained preparations the cytoplasm exhibits the usual 

 structure. The nucleus is generally situated about the middle 

 of the body, but is often found nearer one or the other extremity ; 

 this is due to the movements of the endoplasm. Its elongated 

 axis generally Hes parallel to the long axis of the body. The 

 shape and structure of the nucleus are very characteristic. 

 The nucleus is of an elongate, regularly elUpsoid form, and 

 consists of (i) a well-defined nuclear membrane, (ii) a broad 

 zone of peripheral achromatin, in which the network is not 

 distinguishable, and over which fine chromatin grains are 

 dispersed, and (iii) a large central, spherical or oval karyosome, 

 which is like an entire nucleus in structure and appears very 

 much like a nucleus within a nucleus. The nucleus thus 

 appears to consist of two concentric rings and a deeply 

 staining homogeneous mass in the centre. The inner ring 

 and the central homogeneous mass together constitute the 

 karyosome. 



Development is on the usual fines, and different stages have 

 been described by Bhatia and Setna (1926). 



Habitat. — Seminal vesicles of Eutyphoeus incommodus (Bed- 

 dard) : Punjab, Kasauh. 



10. Nematocystis vermicularis Hesse. (Fig. 12.) 



Nematocystis vermicularis, Hesse, 1909, pp. 155-8, figs. Ixvii-lxx 

 Berlin, 1924, pp. 68, 74. 

 "fNematocystis vermicularis, Bliatia & Chatterjee, 1925, p. 197. 

 Nematocystis vermicularis, Bhatia, 1929, p. 124. 



Trophozoite with a fusiform, rather thick body, rounded at 

 both extremities. The anterior pole ornamented with a cap 

 formed of smaU cylindrical prolongations placed side by side, 

 posterior pole covered by fine hairs directed backwards. 

 Ectoplasm thin, cuticular ornamentations not visible. Endo- 

 plasm rather rich in chromatoid granulations. Nucleus 

 eUipsoidal, situated near one of the extremities of the body, 

 and containing a single karyosome. 



Dimensions. — Scarcely 1 mm. in length and 100 /x in thickness. 



Remarks. — The single specimen obtained by Bhatia and 

 Chatterjee from the seminal vesicles of Pheretima barbadensis 

 (Beddard) closely resembled Hesse's fig. Ixviii a of the species 

 as descrilDed from Helodrilus longus Ude. The size of the 

 specimen was, however, much less, being only 446 /x in length 

 by 69jLt in thickness. The nucleus was situated more towards 



