Il8 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



into a special chamber, as in the last mentioned species ; but 

 probably all open into the clitellar region outside of the zone. 

 There is an abundance of capillaries in the zone, and I 

 have no doubt but that the zone is of sexual importance. 

 Its structure reminds us in some respects of tubercula 

 pubertatis, though there is an absence of true tubercula 

 pubertatis glands. I could not find any regular sense-cells, 

 though these occur in bunches in the epidermis of other 

 somites. 



Septal Glands. — There are four pairs of septal glands in 

 somites V, VI, VII and VIII, the dorsal parts of which 

 gradually diminish in size posteriorly. The dorsal part of 

 each gland is much the largest, being broad and square in 

 longitudinal section, while the ventral part is narrow and 

 elongated. The glands in V, VI and VII are developed 

 dorsally and ventrally, but the one in VIII is developed only 

 on the ventral side of the intestine. These glands are only 

 about one-fourth as large as the corresponding part of any 

 of the anterior glands. The ventral parts of the anterior 

 glands are of about equal size. 



The fharynx is sac-like and in the form of a single dorsal 

 pocket. 



The oesophagus !■& narrow and straight and enters directly 

 into the tubular intestine, which is also straight and only 

 slightly widens between the septa. The diverticles of the 

 intestine originate in the posterior part of IX. They are 

 swollen and the part connecting with the intestine is very 

 broad. The widest part of each diverticle is wider than the 

 intestine in that somite. The folds in the walls of the 

 diverticles are quite simple and resemble those of the intes- 

 tine. Each diverticle has but one cavity, there being no 

 separate chambers as in Ocnerodrilus Beddardi and in O. 

 taste. 



Septa. — Beginning with septum V/VI the ventral parts 

 of the septa are a trifle thicker than the dorsal parts. 

 The first considerably thickened septum is VII/VIII; X/XI 

 is the thickest. None of the septa are thickened close to 

 the body-wall or near the intestine. 



