1916. | J. StePHENSON : Indian Oligochaeta. 319 
Perionyx pincerna, sp. nov. 
(Plate sexx, fies. 12,513). 
Near Ghoom, 7000 ft., E. Himalayas, 16-iv-1911 (NV. Annandale). A 
single specimen. 
External Characters.—Length 45 mm.; breadth 3mm. Colour 
a light brownish grey. Body cylindrical, not flattened ; posterior 
end blunt and squarish, so much so as to give the idea of mutila- 
tion without time for subsequent repair. Segments 88. 
The prostomium is epilobous }, the short tongue being broad 
and delimited by a groove behind. 
The first dorsal pore is in furrow 4/5. 
The setae are in rings; the dorsal break is small and irregu- 
lar —on the average less than 2yz. In front of the clitellum the 
ventral break is absent, or small and irregular; behind the clitellum 
it is small and variable. ‘The setae are set closer together ventral- 
ly than dorsally, but there is no apparent difference in the size otf 
the ventral and dorsal setae, nor any marked difference in different 
parts of the body. The numbers counted were: 47/v, 57/ix, 60/xii, 
50/Xx. : 
No clitellum was distinguishable. 
On segment xviii is a transversely elongated oval ventral depres- 
sion, the margin of which being more sunk than the centre consti- 
tutes a moat around the central area; surrounding the whole is a 
very thick whitish lip, which, though not much raised above the 
general surface, extends as far as to embrace the posterior half of 
xvii and the anterior half of xix. The actual apertures are scarce- 
ly visible, but may be in line with setae c or d. A few penial setae 
are visible as blackened points in the neighbourhood of the male 
pores (fig. 12). 
The female aperture is not visible. 
The spermathecal apertures are small slits near the middle 
line, about one-tenth of the circumference apart, in furrows 6/7 
and 7/8. 
Internal Anatomy.—Septa 5/6 to 9/to are slightly thickened. 
The gizzard, in segment v, is in some degree rudimentary ,; it 
is of moderate size, but its walls are quite soft and thin. The 
intestine begins in xviii. 
The last heart is in segment xii. 
The meganephridia show no alternation in the position of their 
pores. 
Testes and funnels are free in segments x and xi. 
The vesiculae seminales, in xi and xii, are single in each seg- 
ment, situated in the middle line, semicircular in shape, and arch- 
ing over the dorsal vessel and intestine. They are attached to the 
anterior septum of the respective segments. 
The prostates are small lobed masses confined to segment xviii. 
The duct is narrow, of the same diameter throughout, not shining 
nor resistant, and passes, with a slight wavy course, almost directly 
inwards. 
