COE: NEMEKTEANS OF WEST AND NORTHWEST COASTS. 273 



body in the region of the appendix of the caecum shows four dis- 

 tinct portions of tlie aUmentary canal. In the ventral median line 

 is the narrow appendix {((pp), directly above it the esophageal 

 caecum (ec) , above and lateral to the caecum are several sections of 

 the diverticula of the intestinal caecum (*'c'), and finally in the 

 median line directly beneath the proboscis sheath is the narrow 

 stomach (st) . In the specimen which has no such appendix as that 

 described there are, of course, but three divisions of the digestive 

 tract in a similar region. 



An approach to tliis condition is met with in A. bimaculatus 

 (p. 243), where a conspicuous esophageal caecum also occurs beneath 

 the stomach, but is much less complicated than in the present spe- 

 cies. A. rubellus is a third form possessing such an esophageal 

 caecum, which in this case, however, does not extend back so far as 

 the anterior end of intestinal caeca. 



The stomach after originating from the dorsal wall of the esopha- 

 gus immediately sends off a short and liroad cardiac caecum (PL 20, 

 fig. 121, cac) du-ectly forwards toward the brain. The extent and 

 form of this cardiac caecum depend largely on the state of contrac- 

 tion of the parts of the body adjacent. When the body is well 

 extended this caecum probably disapjiears for the most part, and is 

 directly continuous with the stomach. The posterior portions of the 

 stomach are continued into a long and slender pylorus, which does 

 not open into dorsal wall of intestine until far behind the most ante- 

 rior sexual glands. In these two specimens, which are much con- 

 tracted, the opening of the pylorus into intestine is actually farther 

 posteiior to the anterior sexual glands than are these from the tip 

 of snout. I know of no other species of the genus where the 

 pylorus is so extensive as in the present form. 



Correlated with the great length of pylorus occurs a very exten- 

 sive intestinal caecum (fig. 121, ic), which extends forward beneath 

 the pylorus and stomach as usual, sending off' numerous branching, 

 and sometimes anastomosing, 'diverticula beside and above the 

 stomach. These diverticula extend forward to within a short dis- 

 tance of tlie opening of esophagus into stomach and well in front 

 of anterior sexual glands. They are very irregularly branched and 

 narrow anteriorly, but are reduced to short lobes near the posterior- 

 portions of the pylorus, where the median, broad, branched caecum 

 is situated. The unbranched caecum sends forward the two long 



