378 Records of the Indian Museum. [Vor,. XIII, 



kempi, pincerna, inornatus, and sikkimensis ; the Inst mentioned has 

 also thickened septa and characteristic penial setae. 



Pcrionyx graveiyi, sp. nov. 

 (PI. xvi, figs. 7, 8). 



W. 79/1. Pashok, Darjiling- Dist., "E. Himalayas; alt. 5500 ft. 26-v to 

 i4-vi-i9i6. F. H. Gravel}'. A single specimen. 



External characters : — Length 48 mm. ; maximum breadth 2 mm. 

 Colour dorsally a light purple, more marked at the anterior end, 

 with a darker middorsal stripe, pale ventrally. Segments 89. 



Prostomium epilobous f , tongue broad, cut off behind. 



Dorsal pores begin at furrow 6/7. 



The setae are in rings, which are almost closed dorsally and ven- 

 trally ; the middorsal and midventral intervals are perhaps equal 

 to i^yz and n^ah respectively in front of the genital region, and to 

 i\zy and i\ah behind it There are no noteworthy differences 

 between the intersetal intervals. The following numbers were 

 counted: 34/ v, 40/ix, 40/xii, 32/xix, and 32 in the middle of the 

 body. 



The clitellum is very indistinct ; it includes perhaps xiii or 

 -|xiii-xvi = 3i or 4 ; setae and dorsal pores are present. 



The male apertures are on segment xviii, in the form of slit-Hke 

 transverse cracks just behind the level of the setae and between 

 setae a and h on each side (fig. 7), Seta a is particularly black ; h 

 is slightly further out than the h of other segments, and c of seg- 

 ment xviii corresponds to d of other segments in position. The 

 apertures and setae a and h are situated on papillae which meet and 

 fuse in the middle line ; there is a transverse groove in front of and 

 behind the conjoined papillae, so that a strip of segment xviii is 

 left unmodified at the anterior and posterior borders of the 

 segment. 



The female aperture was not visible. 



The spermathecal apertures are in furrows 6/7 and yj^, between 

 the lines of setae a and b. They are thus, like the male pores, very 

 near the midventral line. 



Internal anatomy. — Septa 7/8, 8/9, and 9/10 are slightly 

 strengthened ; there is perhaps some slight thickening of the septa 

 as far back as the prostatic region. 



The gizzard is small, cylindrical, and moderately firm, in seg- 

 ment V. The oesophagus is somewhat swollen in xiv and xv, — in 

 the latter segment transverse vascular channels are visible on the 

 dorsal wall. The intestine begins by a gradual widening in seg- 

 ments xvii to xix ; there is no typhlosole in the anterior portion. 



The last heart is in segment xii. 



Testes and funnels are free in segment x ; funnels were seen in 

 xi but testes were not identified. The vesicula seminalis of segment 

 xi is large and single, extending across the middle line and down on 

 each side of the oesophagus, taking up the whole length and breadth 



