216 Memoirs of the Indian Museum. [Vol. VII, 



thick as the ampulla. The diverticula are rather inconspicuous ; they are small flattish 

 swellings on the duct at about the middle of its length, two in number, sessile, and 

 lobulated (fig. 18). 



The penial setae (fig. 19) are very little modified. In length they are -45 mm., 

 in thickness 18^ ; their shape is that of an ordinary seta, with the usual double curve. 

 The tip is fairly sharply pointed, and there is no nodulus. The margin shows a few 

 small indentations near the tip. 



Perionyx turaensis, sp. nov. 

 Plate X, figs. 20, 21. 

 Above Tura, Garo Hills, Assam ; 3,500-3,900 ft. ; under bark. July-August 1917. S. Kemp. 

 Five specimens and two fragments. 



External Characters: — Length variable, but the differences are probably due to 

 fragmentation. The animal seems to break up easily ; one specimen shows a regene- 

 rated zone at the hinder end. The longest specimen, apparently complete, measured 

 74 mm.; diameter 2 mm. Colour dark brownish purple dorsally, with still darker 

 median stripe ; ventral surface unpigmen ted. Segments 132. The ventral surface is 

 somewhat flattened. 



Prostomium epilobous h or rather more, with squarish posterior tongue, which 

 may or may not be demarcated behind. 



Dorsal pores from groove 4/5 or 5/6. 



The setal rings are almost closed ventrally ; on the dorsal side zz may be twice 

 yz in front of the clitellum, but is less behind. The setae are closer set ventrally, 

 and the ventral setae appear smaller than those on the dorsal side. The numbers are 

 difficult to count, and there are intervals where some seem to have dropped out, 

 so that the following are estimates only: — v/48, ix/56, xii/54, xix/44, and in the 

 middle of the body 55. 



The clitellum is rather narrowed ; it includes two-thirds of segment xiii and 

 extends back to the hinder border of xvii (=4§). The intersegmental furrows are 

 not obliterated. 



The male pores are on xviii, close together near the middle line, on small round 

 papillae. The papillae touch each other or almost so, and are situated in a slight 

 common depression, rectangular or transversely oval in shape, which does not take 

 up the whole length of the segment. 



The female pore is single, and appears as a simple depression or as a transverse 

 slit in front of the setal zone of segment xiv. 



The spermathecal apertures are two pairs, in grooves 7/8 and 8/9, close together 

 near the middle line. 



Internal Anatomy: — No septa are specially thickened, though 8/9 and in an even 

 less degree 7/8 are slightly so. 



The gizzard, in segment vi, is rudimentary. 



A pair of calcareous glands are present in segment xiii as well-defined ovoid 

 swellings in which the vascular channels run longitudinally. The intestine begins 

 in xviii, 



