1920.] J. Stephenson: Oligochaeta from India and E. Persia. 217 



The last heart is in segment xii. 



The arrangement of the anterior male organs was not quite clear. There are 

 seminal vesicles in segments xi and xii, — large square masses filling out the segment, 

 attached to the anterior septum of the segment, those of xi perhaps partly fused 

 together in the middle line, those in xii contiguous only. In x there is a similar 

 structure ; in the specimen first dissected it was definitely noted to be a sac, not 

 merely a compact mass of coagulum ; the funnels appeared to be contained within 

 them, so that they would be testis sacs. In auother specimen (in which however, 

 as noted below, the male organs had an abnormal position) there were no sacs in the 

 corresponding segment, — only a cleanly detachable mass of coagulum ; and the fun- 

 nels were free in this and the next segment. 



The prostates are compact cubical masses in segment xviii, the septa of which 

 are not bulged backwards or forwards. The short and moderately stout duct passes 

 transversely inwards from the hilus. 



The ampullae of the spermathecae have a peculiar shape ; the anterior border 

 is deeply indented, so as to form two or three rounded lobules (fig. 20), the lowest 

 of which may simulate a diverticulum. The duct is thick, short, and not definitely 

 marked off from the ampulla. What I take to be the real diverticula are a few small 

 rounded knobs at the ental end of the duct, which apparently are not always present. 



The penial setae (fig. 21) are -5 mm. long, and ii/< thick at the middle. The 

 shaft is straight with a slight curvature at the distal end, and tapers rather rapidly. 

 The tip however is cut off squarely, and carries five or six fine spines. There are also 

 six circles of fine spines on the curved distal portion of the shaft, just above the tip. 



The abnormal specimen mentioned above had the genital organs two segments 

 further forwards than the normal. Thus the male pores were on xvi, the posterior 

 seminal vesicles in x (extending back however as far as xii), the anterior vesicles in 

 ix, the spermathecae in vi and vii. The male funnels were free in segments viii 

 and ix. 



Remarks : — The nearest relative of the present species is P. parvulus (Stephen- 

 son, 12), from near Ghoom in the E. Himalayas; but the penial setae and form of 

 the spermathecae prevent the union of the two. These two, with P. excavatus, P. 

 fulvus, and perhaps P. bainii, seem to form a closely allied natural group. 



Perionyx pullus, sp. no v. 

 Plate X, fig. 22. 



Belgaum, Bombay Pres 4-vi-1917. T. R Bell. A single specimen, the posterior end broken 

 off. 



External Characters : — Length of the fragment 62 mm. ; diameter max. 3*5 mm. 

 Colour dark grey on both surfaces, scarcely any difference between dorsal and ventral. 

 Segments present 165. Ventral surface concave except at anterior end, thus present- 

 ing a longitudinal groove bordered by prominent ventro-lateral ridges. 



Prostomium epilobous f , the tongue being triangular ; from its backwardly 

 directed point a groove is continued in the middle line back to the clitellum. 



