686 OLIGOCHAETA 



and has no cuticle, we may look upon this region of the gut as comparable to the 

 posteriorly situated gizzards of Bilimba,, &c. The intestine has no typhlosole. 



None of the interseginental septa are greatly thickened ; the first seven or eight 

 are rather stouter than those found elsewhere. 



The sperm-sacs extend from segments ix to xiii. The oviducts do not, as 

 I erroneously stated in my paper upon this worm, lie in a single segment ; but 

 their pores are strictly intersegmental (xiii/xiv) in position. 



(3) Siphonogaster stuhlmanni, MICHAELSEN. 

 S. Stuhlmanni, MICHAELSEN, JB. Hamb. wiss. Anst., ix, 2, 1892, p. 10. 



Definition. Length (apparently) less than in other species. Penial setae not spatulate in 

 form, but like the ordinary setae of the body, though much smaller. Two pairs only, 

 one to each penial process. Setae not ornamented. Hob. Victoria Nyanza. 



This species is only known from two fragments, and its dimensions, therefore, 

 cannot be stated. The extraordinary difference in size between the penial and the 

 ordinary setae is illustrated by MICHAELSEN ; the actual measurements are : penial 

 seta, "172; ordinary seta, -5. The limited number of the genital setae (one pair to 

 each penis) and their shape (much like the ordinary) serves to distinguish the species. 

 A few notes are given by MICHAELSEN upon the internal anatomy, which does not 

 appear to differ from that of 8. mittsoni. 



Genus BILIMBA, ROSA. 



DEFINITION. Setae paired, further apart anteriorly, not ornamented. Gizzards 

 numerous. Spermathecae wanting (?). 



As there is only a single individual belonging to this genus in existence, it is 

 impossible to differentiate generic from specific characters ; and as that specimen was 

 immature it is impossible to give a full definition. The spermathecao may not, of 

 course, be really absent. As, however, the sperm-sacs (in ix-xii), the funnels, the 

 ovaries, the egg-sacs, and the oviducts were all formed, the absence of spermathecae 

 may be a generic (or specific) character. On segments xviii-xxiv is a raised band 

 on either side, as in Annvulrilus a structure which naturally recalls the tubercula 

 pubertatis of many Lumbricids. A marked feature of Bilimba impiUuta is one 



