192 



Memoirs of the Indian Museum. 



[Vol.. I, 



Ä 



St 



interrupted in the dorsal median line {zz about equal to f or f yz) . Number of setae : 

 28-v, 50-ix, 58-xiii, 72-xix, 70-xxvi. 



Dorsal pores inconspicuous, distinct only in the clitellar region. First dorsal 

 pore in the intersegmental furrow 12-13 (?). 



Clitellum ring-shaped, occupying segments 14 — 16 (=3). 



Male pores about one quarter of the circumference of the body apart, on the 

 1 8th segment in the zone of setae, on moderately large transversely oval papillae, the 

 tops of which form special small papillae with the pores. There are about eighteen 

 setae between the male pores. 



Female pores apparently at the lateral ends of a small micdian ventral trans- 

 verse furrow on the 14th segment just before (nearly in) the zone of setae, apparently 

 paired, but very near each other. 



Spermathecal pores three pairs in the intersegmental furrows 6-7 — 8-9, 

 ventro-lateral, those of one pair about f of the circumference of the body distant one 

 from the other. 



Copulatory organs: Broad transversely oval or rounded-rectangular median 

 ventral cushions, occupying the hinder two- thirds or three-quarters of 

 their respective segments, which are ventrally widened out somewhat 

 by these cushions. The cushions are about twice as broad as long, 

 extending laterally nearly as far as the lines of the spermathecal pores 

 and occupying about one quarter of the circumference of the body. 

 The surface of these copulatory cushions bears a great number (more 

 than 200) of densely crowded very fine circular depressions or stigmata — 

 the pores of small glands, as may be seen on dissection. The number 

 and position of these cushions is somewhat variable. In six speci- 

 mens there is only one cushion, situated on the 8th (one specimen) or 

 loth segment (five specimens). In three specimens there are two 

 cushions, situated on the 12th and 13th segments. In one of these 

 latter specimens the hinder cushion of the 13th segment is distinctly 

 smaller than the anterior cushion of the 12th segment. 



Internal Anatomy. — Septa 6-7 moderately strong, 7-8 very 

 strong, 8-9 and 9-10 missing, lo-ii— 12-13 very strong, 13-14 rather strong, the fol- 

 lowing ones delicate. ! 



Alimentary tract : A big, thickly pear-shaped anteriorly thickened gizzard 

 between the thickened septa 7-8 and lo-ii. Intestine in the 26th (?) segment 

 with a pair of moderately large, plain and slender cone-shaped caeca, which do not 

 stretch forward as is the rule with Pheretima, but upward. Behind the zone of 

 the caeca the intestine bears internally a simple, membranous typhlosole, externally 

 a pair of much lobed blood-glands in each segment. 



Circulatory system : I^ast hearts in the 13th segment. - i 



Nephridial system micronephric. 



Anterior male organs: Two pairs of nearly globular seminal vesicles 

 in segments 10 and 11. The two seminal vesicles of one segment are imited in the 

 median line, but there is no communication between the two seminal vesicles of 



F 



23 



A 



Fig. 18. 



Pheretima 

 osmastoni. 



