500 Dr. L. Cognetti Je Mavtiis on the 



septum to the male pore, wliich is placed just behind the 

 circle of setse (PI. XIII. fig. G). Peiiial sette are wanting. 



Tiieie are two pairs of spermathecae in segments viii. and 

 ix. The main pouch is club-shaped; the diverticulum is 

 finger-shaped and opens into the distal part of tiie duct of 

 the main pouch. Ihe length of the diverticulum is nearly 

 equal to a third of the main pouch (PI. XIII. fig. 7). 



JJnb. (yoorloon {Mr. Shu7igara Narayana, 23. vi. 1910). 



An impoitant character of this new spec'iea of Megascolex 

 is the presence of large paired meganephridia in the anterior 

 segments. Similar nepliridia liave been found by Prof. 

 Benham in Mega&colex Laingii, Benh.*, but perhaps in the 

 cephalic region only, where they " probably " perform the 

 office of peptonephridia. 



Mega&colex ratus, sp. n. (PI. XIII. figs. 8-10.) 



Four mature specimens in the collection, but only three 

 of these are complete. 



External characters.— Length : A 230, B 2G0, C 315 mm. ; 

 greatest thickness, on x. segment: A 7, B 9, C 10mm. 

 Number of segments : A 162, B 168, C 218. 



Colour dorsally violet-brown or dark violet, ventrally grey ; 

 grey lin^s are present corresponding to the circles of seta;. 



H«ad tanylobous. The prostomium is short, broad, and 

 provided dorsally with longitudinal furrows, prolonged on 

 to the first segment; this segment is provided with several 

 longitudinal furrows, which do not reach the posterior 

 margin. Segments x.-xiii. are biannulated. 



Setae more crowded in the ventral than in the dorsal region, 

 particularly towards the clitellum, where the circles of setse 

 are interrupted in the middle ventral line {aa — 2 ab, 

 ah = bc-=cd ....}, but the interstice is wanting at the 

 dorsal region [zz=^yz^=xy ....). Somewhat behind tiie 

 clitellum the circles of setai are provided with two middle 

 interstices (aa = 3 or 4 ah, zz='6 or 4 yz). 



There is no great difference in the dimensions of the setse 

 of a circle. At the x. segment there are about 180 setaj, and 

 in the middle region of the body about 135 setai on each 

 segment. 



Clitellum saddle-shaped, occupying segments xiv.-xviii., 

 unprovided with intersegmental lurrows. On the xiv. 

 and XV. segments it is a little more extended than on the 

 following segments (PI. XIII. fig. 8). 



* See (i) pp. 273, 274. " The worm is micronepbridic, anteriorly is 

 B large glandular body, which is probably a peptonephridiiini." As 

 iegiuds ihe term " peptouephridium," consult my uute ol lUOS (s). 



