NEW SPECIES OF OCNERODRILUS. 265 



Ocnerodrilus agricola, n. sp. Figs. 34, 41, 44, 46, 54, 

 81. 



Clitelluni is very small, occupying only four somites, 

 from xiv to xvii, inclusive, sometimes transgressing on the 

 adjoining somites xiii and xviii. But the shortness of the 

 clitellum is not its only characteristic. It does not extend 

 to the region nearest the ventral ganghon, as in the 

 other species, but immediately around the male pore in 

 somite xvii it shows a half-moon like margin, leaving a 

 round disk-like zone surrounding the male pore. But 

 this zone is much thickened, of a somewhat different 

 structure from the clitellum. The specimens having be- 

 come much macerated, I could not fully make out this 

 structure, but it occupies the whole width of somite xvii 

 and part of xvi, on which latter it curves with a concave 

 sweep towards the anterior part of that somite. 



Spej'mathecal pore in somite ix, close to the septum and 

 in the inter-segmental groove. 



Sperniiducal fapiihe, one pair in somite xvii. 



Ovipore in somite xiv. 



The anterior septal gland in somite v is longer and 

 broader than the one in somite vi. The septal gland in 

 somite viii is very low, and is the smallest one of the four 

 glands. The anterior gland is less lobed than in O. 

 Beddardi, or in O. guateinalcp. 



The septa in the gland bearing somites are, as usual, 

 thicker than the other septa. 



Spermatheccv, one pair, are found in somite ix. In 

 shape the spermatheca differs from those of the other 

 species, in being almost globular without an}- diverticula, 

 and of a size at least twice as large as the spermatheca of 

 Ocnerodrilus Beddardi. In general shape it agrees with 

 the same organ in O. Eiseni, as described and figured by 

 Beddard, but it is larger and more globular, apparently but 



