394 Records of the Indian Museum. [Voi,. VIII, 



Pcrionyx dcpressus, sp. nov, 

 (PI. xxvii, fig. 14.) 



Rotung, alt. 1300 ft. ; from wet earth at base of plantain leaves ten feet 



from the ground ; 28-xii-igii. Three specimens. 

 Same place and date ; from dry earth at base of screw pine leaves 16 feet 



from the ground. Six specimens, some quite small and immature. 

 Same place ; from base of leaves of screw pine 15 feet from the ground ; 



i-i-igi2. Three mature specimens, two small and immature, and a 



few fragments. 

 Same place ; in bamboo ; Jan., 1912. A single specimen. 

 ■ Upper Rotung, alt. ca. 2000 feet ; at base of plantain leaves 20 feet from 



the ground ; 5-i-i9i2. Two complete specimens and six fragments. 



Length, average 3-4 inches, max. 4^-5 inches ; diameter 3 

 mm. Colour a uniform dusky purple dorsally, rather lighter ven- 

 trally ; clitellum rather lighter than the rest, and of a pink tinge. 

 Segments 156. 



The bod}^ is flattened dorso-ventrally. The ventral surface 

 is hollowed so as to present the appearance of a shallow groove 

 along the whole or the greater part of its length. A mid-dorsal 

 groove is also present but variable ; it may be narrow and 

 visible throughout the length of the animal, or narrow on the 

 prostomium and segment i, shallow and ill-defined for some dis- 

 tance behind this, and absent posteriorly. 



Prostomium epilobous I. 



First dorsal pore in furrow f, in the specimem first examined; 

 in another, the first pore, smaller than the rest, was in furrow I. 



The setae are arranged in rings with a regular small niiddor- 

 sal interval (2:2:^= a little more than 2y2;), but unbroken ventrally. 

 They are set rather closer together ventrally than dorsally : in 

 number (counted in segments ix and xiii) they are about 70 per 

 segment. 



The clitellum extends over i xii-i xviii =-- 6 nearly (estimated 

 by the pink colouration). The body is slightly swollen in this 

 region. The setae are present, the dorsal pores doubtfully so; 

 the slight ridge on which the setae are placed is less obvious or 

 absent here. 



The male apertures are on segment xviii, distant apart 

 about i of the circumference. Each is situated in a depression 

 which occupies the whole length of the segment antero-posteriorly , 

 and which is about equal in transverse extent to the non- 

 depressed area between the two (fig. 14). The depressions and 

 intervening area are pale in colour. The male aperture at the 

 bottom of the depression is accompanied by a couple of narrow 

 grooves, one in front and one behind it, which extend trans- 

 versely across the whole breadth of the depression. The 

 aperture, represented in the figure as a rounded pore, has in 

 some specimens rather the form of a slit. There are no setae in 

 or between the depressions. 



The female aperture is minute, in the centre of a small 

 slightly darkened area near the anterior border of segment xiv. 



