1020] J. Stephenson: Ol igochaeta from India and E. Persia. 237 



Dichogaster, and Trigaster ; I do not however suggest at present that any of these 

 genera are derived from this species, or indeed from the genus Octochaetus at all. 



There are no calciferous glands. The intestine begins in xvi. 



The last heart is in segment xii. 



The excretory system is micronephridial. In the postclitellar segments the organs 

 are few in each segment and of moderately large size ; they are placed in a transverse 

 row in each segment, about seven on each side, and in each row they increase in size 

 from the ventral end of the row as far as the fifth nephridium, but the two most 

 dorsal are smaller again. This was the condition in the anterior part of the animal, — 

 in that part usually opened for dissection ; on opening the posterior part of the 

 specimen the difference in size was found to disappear towards the hinder end. 



A curious modification of the nephridia, which I have not seen before, was found 

 in segments xi and xii. In each of these segments a ventrally situated pair of 

 structures attracted my attention ; these appeared at first to be flattened bags, rather 

 oval in shape, taking up approximately the whole length of the segment from one 

 septum to the other, and attached by a stalk at their inner ends to the body-wall 

 near the middle line. They could be detached from the body-wall except where they 

 were attached by the stalk ; there was nothing to correspond externally. They were 

 present in the same segments and the same position in the second worm from 

 Panchgani. Microscopically they were found to be masses of micronephridial tubules, 

 arranged in a compact series of parallel loops, the loops running transversely to the 

 long axis of the oval mass. 



Testes and funnels were free in segments x and xi, along with much flocculent 

 matter. 



There are two pairs of seminal vesicles, in ix and xii. Both pairs are of moder- 

 ate size ; those in xii are racemose, those in ix have almost smooth borders. 



The prostates are two pairs ; they are tubular, of moderate size, the glandular 

 part consisting of a series of apposed loops. The duct is very narrow at its begin- 

 ning, but soon widens ; it makes a complete bend, and then passes inwards and 

 slightly forwards ; it is of some length, straight after the initial bend, stout and 

 shining. 



The ovaries are in segment xiii ; ovisacs are present in xiv. 



The spermathecal ampulla is elongated, narrower towards its blind end, swollen 

 near its base, of moderate size ; the duct is quite short, and appears dilated, so as to 

 be subglobular. The diverticulum is single, stalked, rounded, about equal in size to 

 the duct, to the side of which it is attached ; the diverticulum shines with contained 

 spermatozoa, but is not chambered (fig. 41). 



The penial setae (fig. 42) are 79 mm. long, and 7 to 8/. thick at the middle. 

 The shaft is slightly bowed, and tapers gradually towards the tip ; the point is fairly 

 sharp, and there is no ornamentation, but the distal end of the seta has a curious 

 wavy outline. 



Remarks : — The present form appears to be related both to the last (smooth 

 penial setae), and also to the anomalous and somewhat problematical O. bishambari 



