ENCHYTR^ID^ IO5 



californica the setce are of a more uniform size. The figures of the 

 setce of the two species are not drawn to the same scale, as their re- 

 spective size is not particuUirly characteristic. The most ventral setae 

 in the ventral fascicles are more blunt than the other setae. 



Peptonephridia. — The specimen which was sectioned showed the 

 typical arrangement of the peptonephridia, that is, the glands were 

 closely adhering to the intestine. In somite III the glands show sev- 

 eral short lobes projecting free out into the coelom. In somite IV the 

 gland is thin and shows no free lobes. But in V short lobes begin to 

 appear, and in VI they are more numerous, their free projections 

 being about as long as the intestine is wide. In the specimen that was 

 dissected the two salivary glands (pi. xv, figs. 2, 3) were folded on 

 themselves, projecting forward and not in any way adhering to the 

 intestine. Their shape, however, so far as can be judged from a com- 

 parison with the sectioned glands, resembles the latter in all particulars 

 except location. 



Intestiiie. — The tubular part is furnished in VIII with a pair of 

 diverticles which not only fill the largest part of VIII but also project 

 into VII. The inner lobes of the diverticles are much coarser than in 

 H. californica^ the villi being less numerous and more of the nature 

 of those of the diverticles of Benhaniia. At the posterior end of the 

 diverticles there is a large valve opening into the sacculated intestine. 

 The epithelium of the tubular intestine is twice as thick as that of the 

 sacculated intestine. 



The sperm-ftin7iels are short and ovoid. The sperm-ducts are nar- 

 row and apparently confined to the clitellar somites. 



Penial papilla. — There are four kinds of glandular cells. Two 

 kinds open into the sperm-duct, while two open into a small pore im- 

 mediately in front of the spermiducal pore but on the same papilla. 

 There are, however, only three very distinct kinds of glands, as the 

 large glands of the sperm-duct and the large glands of the anterior 

 pore resemble each other so much that they can hardly be distin- 

 guished one from the other. The smaller cells of the sperm-duct have 

 oval nuclei. These glands open immediately above the pore, while 

 the larger glands open at the pore but still into the sperm-duct. The 

 small glandular cells of the anterior pore stain darkly and appear to be 

 of a very distinct nature from the others (p1. xv, fig. 6). 



Genus Fridericia Michaelsen. 

 Definition. — Setae straight; each fascicle contains setae of different 

 sizes, the larger ones situated outside of the smaller ones. Head-pore 



