290 CALIFORNIA ACADEMY OF SCIENCES. 



Septa (figs. I a., 2 s.). The septa exhibit the same 

 general features as those in Ocnerodrilus and Gordio- 

 drilus. The first anterior septum is found between 

 somites iv and v and is thin and imperfect. The 

 posterior parts of the pharynx and buccal region rest 

 against this septum, only when the body is contracted, 

 otherwise there is a short oesophageal part in this somite, 

 which in an extended worm intervenes between the 

 pharynx and the septum. 



The four septa posterior to this one, that is those be- 

 tween somites iv, v, vi, vii, viii, are much thickened, but 

 not to the same degree. The septum between v and vi, 

 is thinner than the other three, about twice as thick as 

 the septum between iv and v. The other three septa are 

 of almost the same thickness and about three times as 

 thick as the one between iv and v. 



As usual the septa are thickest in the center, thinning 

 out towards the junction with the body-wall. The septa 

 following these are of the usual thinness, those anterior of 

 the clitellum being thicker than those in the clitellum or 

 posterior to it. 



Alimentary canal (figs, i, 2, 18 and 19). The alimen- 

 tary system resembles that of Ocnerodrilus with few 

 less important exceptions. As usual we can distinguish 

 the following distinct regions: buccal cavity, pharynx, 

 oesophagus, diverticula, tubular intestine and sacculated 

 intestine. 



The buccal cavity extends almost to the posterior part 

 of somite iv, and is eversible. Its walls are much thicker 

 than in any species of Ocnerodrilus which has come to 

 my notice, especially so in the posterior ventral side of 

 somite iv. 



The pharnyx occupies somites ii, iii and part of iv, and 

 is developed only on the upper side. It is much smaller 



