Oligochcefa of Travancore. 499 



Number of setse iipaily constant in each segment, about 24, 

 both at the anterior and at the middle and posterior regions. 

 The circles of seise are regularly but not broadly interrupted 

 ventrally {aa = 2 ah) ; dorsally the setae are a little more 

 distant. 



Clitellum developed all round the body and occupying 

 segments xiv.-xvii. 



First dorsal pore on intersegmental furrow viii.-ix. 



On intersegmental furrows (?ii.-iii.) iii.-iv. — viii.-ix. is 

 found a pair of little nephridial pores, in the lines of setaj e. 



In the middle ventral region of the xviii. segment there 

 are a iew large, but well-mark(d triangular papillae, which 

 enclose a little triangular area (PI. XIII. fig, 5). One of the 

 angles of the papilla is directed forwards and extended on 

 the posterior margin of the xvii. segment. Other angles are 

 lateral, and near them are found the male pores, in tlie lines 

 of setae h. 



Spermathecal pores two pairs, on intersegmental furrows 

 vii.-viii. and viii.-ix., in the lines of setse h. 



Internal anatomy. — Septa vi.-vii. — ix.-x. moderately 

 thickened. 



A gizzard in the v. segment. The oesophagus is irregu- 

 larly swollen in segments xv.-xx., but is not provided with 

 calciferous glands. The wide intestine suddenly begins in 

 the xxi. segment. Last hearts in the xiii. segment. 



On segments iii.-ix. is found respectively a pair of large 

 nephridia. These organs consist of a proximal portion, from 

 which originates a thin-walled ribbon-like duct, which in- 

 creases in length from the first to the seventh pair of 

 nephridia and passes through the body-wall at the extreme 

 anterior margin of each segment. The proximal portion of 

 these meganejjhridia is conspicuous, and consists of a tuft of 

 very thin whitish filaments, each of which contains a long 

 strip of nephridial tubule. 



From the x. segment the nephridia are diffused and very 

 small, but on the xiv. and xv. segments, on each side of the 

 oesophagus, is found a pair of meganephridia (besides the 

 small micronephridia) which are similar to those of segments 

 iii.-ix. 



Testes and sperm-duct-funnels free in the x. and xi. seg- 

 ments. Two pairs of grape-like sperm-sacs lie in segments xi. 

 and xii., depending from the anterior septum. 



The glandular part of the prostates is much lobed and 

 extended into segments xvii.-xx. The muscular duct of 

 each prostate lies in the xviii. segment, in which it describes 

 a curve towards the middle ventral line, from the anterior 



no 



