DESCRIPTIONS OF GENERA AND SPECIES 619 



the presence of a series of papillae, instead of a penis, in the large spermatheca, which is 

 but little enclosed by the sacs containing the ovaries, &c. ; the position of the testes also 

 distinguishes the two genera. 



The male generative organs, so far as concerns the funnels and the sperm-ducts, 

 agree entirely with those of the last species ; the testes, however, are placed, as 

 occasionally in the genus OctocJiaetus and Acunthodrilus, on the posterior face of 

 the segment in which they lie ; each testis is enclosed in a small sac which also 

 surrounds the dilated part of the sperm-duct ; these sacs may or may not have any 

 connexion with the sperm-sacs which lie in the following segments ; I observed none. 



The female reproductive organs are in several ways remarkable. In the first 

 place the spermathecae, instead of being a small sac as it is in Hyper iodrilus, is 

 very large; it reaches from its opening on to the exterior (on the eleventh segment) 

 back as far as the thirteenth segment. In this segment it has become much wider 

 and is bent round to one side ; the extreme tip is enclosed by a sac, which lies within 

 a large sac connected with the general egg-conducting apparatus. Both these sacs 

 are coelomic pouches ; but it is curious to find two, one within the other. The 

 outer sac narrows into a tube which communicates with the ovarian sac of its side 

 of the body (the right); from the latter sac which, of course, contains the ovary, 

 arises another tube which runs forward to the egg-sac; the same is the case with 

 the ovarian sac of the opposite side of the body. The two ovarian sacs are connected 

 as in Hyperiodrilus by a narrow tube which lies above the spermathecae, here 

 a very narrow tube. There is one species — 



Heliodrilus lagosensis, Beddaed. 



H. lagosensis, Bebdaed, Q. J. M. S., vol. xxxii, 1891, p. 2,S3. 



Definition. Length, about 100 mm. A series of median papillae upon, segments X-XV, 

 more or less asymmetrical in position. Septa V/XTII. thickened. Hearts in XI-XITI. 

 Spermiducal gland indistinctly divided into a glandular and muscular region. Hah. — 

 Lagos, W. Africa. 



Genus Alvania, Beddaed. 



Definition. Setae paired, ventral setae further apart than dorsal. Clitellum, 

 XV-XVII. Male pore between XVII/XVIII, connected by a groove with 

 two penes upon XIV or XV. Spermatheeal pore on X. Caleiferous glands 



4 K 2 



