258 CALIFORNIA ACADEMY OF SCIENCES. 



cola, the spermatheca? of the two species being of the 

 same general form, but much larger in O. agricola. The 

 clitellum in the latter species is also the smallest. 



Ocnerodrilus Rosae, ;;. sf. Figs. 23, 24, 25, 26, 36, 48, 

 79- 



This is a small species, in size a little longer but not 

 any wider than Ocnerodrilus occidentalis or about i 

 inch by )4^ Hne. The body-wall is peculiarly thin, es- 

 pecially in somite xii, and more transparent and less 

 tough than in O. occidentalis. Clitellum commences at 

 the anterior ^ or ^ of somite xiii and extends to xviii. 

 There is no ventral zone surrounding the male pore as in 

 O. agricola which this species otherwise comes near. 



The set(£ are as usual, and the inner couple in somite 

 xvii is wanting. 



Sperniathecal pore in xix. 



Ovifore as usual in xiv and Sferniiducal or male 

 papillcp (one pair) in xvii. 



This species appears to form a group with O. contractus 

 and agricola. 



The upper part of the peristomium is longer than the 

 second somite, but the prostomium appears smaller than 

 in other species. The buccal region extends to the pos- 

 terior part of somite ii when the worm is contracted. 



PJiarynx occupies somites iii, iv and v and is as usual 

 verv muscular and glandular, but the salivar}^ glands on 

 the upper side are much larger than in an}' other species, 

 projecting backwards and encroaching on somite v in 

 such a way that the septal gland in this somite is pushed 

 backwards into somite vi. 



The four septal glands in somites v-viii are smaller 

 than in other species and crowded together in the space 

 below three segments. In other words, the salivary 



