204 Memoirs of the Indian Museum. [Vol. VII, 



Three pairs of seminal vesicles are present. The largest are those in xii, of 

 moderate size and lobulated ; in segment ix is a second pair, rather smaller and also 

 lobulated; the third pair, in x, are smaller still, and attached to septum io/ii. 



The prostates are tubular, and consist of a number of thick, adpressed opaque 

 coils which extend through several segments. The duct is relatively short, proceeds 

 almost straight inwards, and is narrow but broadens slightly towards its ectal end. 



Ovaries and funnels have the usual situation. 



The spermathecae are one pair. The ampulla is a large irregular sac, with much 

 crenulated margins (fig. 6) ; the duct is about as long as the ampulla, of moderate 

 thickness and approximately the same diameter throughout. There is a single diver- 

 ticulum, originating at the ental end of the duct, lobulated, about half as long as the 

 duct, to the side of which it is adherent. 



There are no penial setae. 



Genus Perionyx.' 



Perionyx sansibaricus, Mchlsn. 



Plate IX, fig. 7. 



Maninad. Bombay Pres 28-vi-1917. B. Prashad. Numerous specimens. 



Igatpuri, Bombay Pres. 29-vi-1917. B. Prashad. Two specimens. 



Khandwa, Central Provinces. 23-vi-l917. B. Prashad. Numerous specimens 



KalaKhund, between Khandwa and Indore, Central India. 23-vi-1917. B. Prashad. Three 

 specimens. 



Baroda, W. India, on the banks of the river Vishvamitri. 9-vii-1917. B. Prashad. A single 

 specimen. 



Wathur, near Mahableshwar, W. India. 6-vii-1917. B. Prashad. Nine specimens. 



Londa, ten miles from Castle Rock. Bombay Pres. 6-vii-1917. B. Prashad. Eleven speci- 

 mens. 



This interesting species has been previously recorded from Kodaikanal in the 

 Palni Hills (Michaelsen, 3). From the present records it appears to be common in 

 Western India. One of its distinguishing characters is the alternation in situation of 

 the terminal bladders and external openings of the nephridia ; these are placed at 

 about one-third of the half circumference from the mid-dorsal line, and a similar dis- 

 tance from the mid-ventral line, in successive segments ; as the end bladders are easily 

 seen on opening the animal (unlike most species, where they are small or absent), 

 the peculiarity is obvious in any dissection. The alternation is however, according 

 to my dissections, approximate, not exact ; two successive nephridia not uncommonly 

 end at the same level on the body- wall, and once a series of four were seen to 

 do so. 



I append a few notes on the numerous specimens with which I have had to deal. 



External Characters : — The purple colour of the dorsal surface extends partly 

 on to the ventral side of the animal in the most anterior segments. I found this 

 character of help in separating worms of this species from others when several 

 species were mixed together in a single catch. 



The dorsal pores, which Michaelsen found to begin in groove 9/10 or 8/9 in his 



