488 Howard Edwin Eiulers. 



the eleventh segment in the anterior region through the twelfth and 

 thirteenth segments as large parallel cylinders. The dilated green 

 intestine rests upon their dorsal side. 



The thirteenth segment (second of the mid-region) includes all 

 that portion of the animal between the twelfth segment and the first 

 palette. When fully extended it may be as long as the whole anterior 

 region. In the middle of its ventral side is found the adhesive disc 

 mentioned and described above, as setting like a small saddle over 

 {i. e., beneath) the ventral longitudinal muscles. It communicates 

 laterally by two yellow strands of tissue, continuations of the body 

 cavity, with Laffuie's "dorsal cupule" in such a manner as to sug- 

 gest a "two-collet ring" about the worm. I shall, provisionally, 

 name the "dorsal cupule" the accessory feeding organ of the second 

 mid-segment. On the anterior half of the dorsal side is the greatly 

 dilated light green portion of the intestine. During life it is marked 

 here and there by purse-like swellings which are in constant rhythmic 

 motion from before backwards. The posterior half of the dorsal 

 side consists of the convoluted portion of the conspicuous green intes- 

 tine, whose w^hole surface is traversed by peristaltic waves. 



Upon the dorsal side and about the middle of the segment is 

 situated the hollow muscular accessory feeding organ which was 

 mentioned above. It has the form of a cowl or hood which opens 

 dorsally (Figs. 2, 3, 5 and 7). Its smaller open end is joined by a 

 narrow pedicel to the two diverging, tubular portions of the body- 

 cavity which unite to the ventral adhesive disc and thus give to the 

 whole the general aspect of a "two-collet ring." From the pedicel 

 of this structure a solid strand of muscle extends anteriorly over the 

 dorsal surface of the intestine to the base of the twelfth segment. 

 Cosmovici's view that this was a continuation of the ciliated groove 

 of the anterior region was plainly shown to be erroneous. When the 

 ventral muscles contract the dorsal strand also contracts and causes 

 the accessory feeding organ to be raised vertically or tilted forwards 

 (Figs. 3 and 4) so that it takes a position somewhat wathin or imme- 

 diately back of the arch which is formed by the joined aliform noto- 

 podia of the twelfth segment. The accessory feeding organ bears 

 gland cells scattered over its o\iter surface, but the inner surface 

 bears a ciliated epithelium. 



