THELOHANELLUS . 



343 



reduction nuclear chromatin particles lying free in the 

 cytoplasm of the mother-cell. The pansporoblast ultimately 

 divides into two daughter-cells or sporoblasts, each with five 

 nuclei ; two of these unite later to form the nucleus of the 

 sporoplasm, one forms the nucleus of the polar capsule and 

 the other two are for the spore -membrane. A fully formed 

 spore is an elongated pear-shaped body, rounded posteriorly 

 and acutely pointed anteriorly. The spore-wall consists of 



B 



Fig. 169. — Thelohanellus rohitse (Southwell & Prashad). A, gill with 

 cysts ; B, young spore ; C, mature spore. (After Southwell 

 and Prashad.) 



two valves ; the suture is a distinctly thickened ridge lying 

 parallel to the long axis of the spore. There is only one 

 polar capsule in each spore, with a long and much-coiled 

 polar filament. An iodinophilous vacuole is present. 



Dimensions. — Cysts 3"l-3'8 mm. by 0'8-r2 mm. ; spores 

 30-32 fjL by 7-8 ju, ; polar capsule 22-23 /x in length. 



Habitat. — Gills of Labeo rohita (Ham.-Buch.), from Turag 

 Biver : Bbngal, Mirpur, Dacca. 



