54 



Mr. 0. R. Narajan Rao on some 



l>art of tlic body M'liicli is quadrilateral in cross-section 

 hoars dorsal and ventral wide and lateral, sometimes deep 

 canals. Total number of segments 270-385. The pre- 

 clitellar segments, nearly twice the size of the postclitcllar 

 ones, bear a number of prominent secondary annular ridges 

 and grooves. The clitellar segments witii the latero-ventral 

 Avings are the ])roadest and soft, bearing ventrally irregular 

 grooves and ridges. The number of segments surrounding 

 the anus can hardly be counted, owing to extreme shortness. 

 Anus a large longitudinal slit, dorsal in position, borne 

 on a swollen cone or on the unmodified posterior region. 

 Prostomium pro- or zygo-lobous. 



Fig. 1. 



A seta (i) from the middle of body of GhjphidnlnsJluviatiUs, x 75. 



Dorsal pores absent. 



In the preclitellar region the seta-distance is aa, equal to 

 or slightly less than Z>c or rfrf; bc = dd ; ab = cd. In the post- 

 clitcllar region aa : ab : be : cd : dd-=2 : i : 1 : ^ : 1| or 2. A 

 seta from the preclitellar region measures nearly 0'75 mm. 

 long and 0"12 broad. The skin is raised in a tent-like 

 fashion over the seta in the middle and hinder ])art of body. 

 The projecting part of the sette is ornamented by delicate 

 annulations, and the stem emljcdded in the follicle bears a 

 few irregularly-disposed spines, and the whole structure is 

 marked by fine 'striations, the distance between any two 

 striie being 1150 /x. The first segment is free. 



