190 MEGASCOLEX HASSELTI. 



in the 26th segment tlie intestine is provided with two 

 caeca. The large copulatory pouches are placed in the 

 7th and 8th segment; they consist of two different parts: 

 a large , oblong vesicle with a short efferent duct , and 

 a small round pouch , connected with the former by a long 

 screwlike wound tube. The small pouch contains an 

 orange-coloured substance , which highly magnified appears 

 to be a mass of densely crowded, slender, undulated 

 threads, thickened at one end and which decidedly con- 

 stitute the spermatozoa. In the 11th and 12th segment 

 are placed the male genital organs , their vasa deferentia 

 both are provided with a single funnel-shaped mouth, 

 situated in the 11th ring, not free in the perivisceral 

 cavity, but inclosed within the seminal vesicle. The 

 prostatic glands are strongly developed, lobated , extending 

 from the 17th to the 22th segment. The efferent duct of 

 each gland is a short , thick-walled , S-like bended canal , 

 that joins near its origine the vas deferens , and opens out- 

 wards on a cushion-like thickening of the bodywall. 



Length 70 m.m.; number of segments 94. 



Hab. Sumatra (Lebong). 



Megascolex Rasselti n s. 



This species differs from all i¥«^asro/eA'-species hitherto 

 known by the characteristic arrangement of its bristles. 



The cephalic lobe extends nearly over the whole length 

 of the buccal segment. 



Each ring bears 70 to 75 bristles ; however they are 

 not all placed on equal distances', as in other Megusrolex- 

 species , but on the ventral side about forty of them stand 

 densely crowded together in two symmetrical groups, 

 separated by a small interspace iii the median ventral line. 

 By this characteristic arrangement of the bristles M. IJat<~ 

 selti contrasts very reraarquably with P. Inzonica Perr. 

 and P. biserialis Perr. '), in which the bristles just are 



1) Oompt. Kend T. LXXXI. 



Notes from the Leyden IMiiweum , "Vol. V. 



