1916. } J. STEPHENSON : Indian Oligochaeta. 317 
The prostate, situated posterior to the nephridium in xviii, is 
extraordinarily small. It appears as a small white mass frayed 
out into a number of finger-like processes laterally; it is almost 
sessile on the bodywall, and no separate duct is visible. 
Ovaries and funnels are present in the usual situation. A curved 
ridge on each side on the posterior face of 13/14, embracing with 
its fellow the alimentary tube, may possibly represent an ovisac. 
No trace of spermathecae was visible internally. 
Remarks.—There is a possibility that the specimen is imma- 
ture. The absence of spermathecae (though there is an indication 
of their apertures), small size of prostate, and absence of clitellum 
seem to point to this; the rest of the sexual apparatus however is 
well developed, and small size or absence of prostate is not very 
infrequent (¢g. the common Pheretima heterochaeta, Michlsn.). 
The condition of the nephridia however decided me to describe the 
specimen; one might say that the meganephridia are here caught 
in the act of dividing up. The mixed mega- and micronephridial 
condition which results is certainly not that of the known species of 
Lampito however, and the systematic position of the specimen is a 
little puzzling. 
Gen. Perionyx. 
toate ae excavatus, E. Perrier. 
Almora, 5500 ft., Kumaon, 16-ix-1911 (C. Paiva). Several specimens. 
Under sone or mud by tank, Mesa compound, Calcutta, 8-iv-1g10 
(Ff. H. Gravely). Three specimens. 
In leaves of water plants, Sahasar Dhara, near Dehra Dun, 6-iv-1914 
(Prof. S. R. Kashyap). A single specimen. 
Painsur, above Lohba, 8000 ft., 23-iv-1914 (Col. Tytler). Several speci- 
mens. (Doubtful, immature). 
Perionyx pulvinatus, sp. nov. 
(Plate xsexi= figs 10:11). 
Near Ghoom, 7ooo ft., E. Himalayas, 16-iv-1g11 (N. Annandale). Six 
specimens. 
External Characters.—Length 57 mm., maximum breadth 3°5 
mm. Dorsally the colour is in general a deep brown with darker 
median stripe, but is lighter over and in front of the genital region; 
ventral surface pale. Body dorso-ventrally compressed, except the 
most anterior segments; ventral surface flat, indeed rather concave; 
posterior end tapering. Segments 126. 
Prostomium well-marked, epilobous 3, tongue delimited by a 
groove behind; prostomium and first two segments marked by a 
median dorsal groove. 
Dorsal pores exist from furrow 5/6. 
The setal ring shows a small and irregular dorsal break ; 
zz== 2-3yz. The neighbouring intersetal distances are also irregular. 
The ring is unbroken ventrally; and the setae are much closer 
ventrally than dorsally. All the setae are small and difficult to 
count. The following numbers were met with: 56/vi, 54/ix, 50/xii, 
