DESCRIPTIONS OF GENERA AND SPECIES 515 



of the spermiducal gland pores ; there seems to be no muscular sac into which these 

 open. There are papillae, one pair in front of and to the outside of the male pores, 

 the second pair in a corresponding position behind the male pores. The sperm-ducts 

 open independently of the spermiducal glands a little to the outside of them. 



(13) Ocnerodrilus afflnis (MICHAELSEN). 

 Pygmaeodrilus affinis, MICHAELSEN, loc. cit., p. 6. 



Definition. Length, 60 mm. ; diameter, 1-5 mm.; number of segments, 106. Clitellum, 

 XIII XVIII, complete. No gizzard. Spermathecae single and median, with four 

 diverticula. Hab. Victoria Nyanza, near Bukoba. 



The genitalia of this species appear to be like the last with the exception of the 

 points mentioned in the above diagnosis, but they were not in a good state of 

 preservation. The thick muscular duct of the spermathecae shows signs of a division 

 into parts. There are four papillae, one pair in front and one behind male pore, 

 on level with ventral setae. 



(14) Ocnerodrilus lacuum (BEDDARD). 

 Pygmaeodrilus lacuum, BEDDARD, Q. J. M. S., xxxiv, 1893, p. 259. 



Definition. Length, about imm.; numlier of segments, about 120. Dorsal pores present. 



Clitellum,, XIII XXVI, saddle -shaped. Ventral setae of segment XVII absent. Sepia, 



V/X, thickened; septal glands well developed. Gizzards, two in VI, VII; intestine 



begins in XII. Nephridla commence in segment VI. Testes, one pair in XI ; sperm-sacs 



in XII. Sperm-ducts open in common with spermiducal gland, uniting just at pores. 



Spermathecae in IX, without diverticula. Hab. Lagos, West Africa. 



This species appears to possess no papillae. The above description will show that 



there is no danger of confusing this species with the others. The living worm was 



very slender and largely of a chalky-white colour, caused by numerous coelomic 



corpuscles. The spermiducal glands (at any rate of one example) were very long, 



and folded extending through six or seven segments. The ventral setae of segment 



xviii are absent. 



Genus NANNODBILUS, BEDDARD. 



DEFINITION. Small worms with paired setae. Nephridia paired. Gizzard rudi- 

 mentary. Caleiferous gland in IX. Spermiducal glands lined by a single layer 

 of cells ; posterior of two pairs open on each side into a taursa copulatrix, which 



3 u 2 



