NEW SPECIES OF OCNERODRILUS. 23I 



one pair, are in somite xix. The ovipore, one pair, 

 in xiv. The male pores are in somite xvii. The 

 nephridio-pores open in front of all the ventral setaj. 

 Seen from the exterior the posterior nephridia appear 

 like heavy white masses, entirely filling the somites. The 

 setce resemble those of the other species of the genus, 

 are not sculptured or bifid. They are present in all the 

 somites except the first. In the inner couple of somite 

 xvii the inner seta is wanting, there being only one seta 

 in the immediate vicinity of the male pore. All the 

 setae are of equal size and form and distance from each 

 other in each couple. The prostomium is well developed 

 and narrower than in O. occidentalism but of similar form 

 as in most of the other species. 



Sefta. The septa separating the somites begin be- 

 tween somites iv and v, and continue from there on to 

 the posterior end of the body. In the segments of the 

 clitellum they are much reduced. The septum between 

 iv and v is very thin, the following four septa separating 

 somites v-ix are much thickened, and thicker than those 

 in any of the posterior somites. They increase in 

 size posteriorly in such a way that the septum between 

 somites viii and ix is the thickest of the four, although 

 this septum supports only a very small septal gland. The 

 succeeding four septa are much thinner and about equal 

 to the one between somites iv and v, but thicker than 

 those situated behind the clitellum. The septa be- 

 tween somites v-viii posteriorly, are sparsely covered 

 with small glandulous cells, especially in the region of 

 the oesophagus. A quantity of perigastric cells are seen 

 floating around in all the somites. These cells are round, 

 with granulated contents (fig. 9). 



Septal glands (fig. i, s. gl., 45). Somites v-viii con- 

 tain septal glands, which in the first four somites (v- 



2d See., Vol. III. ( 18 ) January 19, 1893. 



