ENCHYTR^ID-^ 97 



and no indication of any secretion. Moreover, a part of their mass 

 lies wholly in the septal gland and resembles greatly the structure 

 which Michaelsen (3) has described as ganglionic in the septal glands 

 of Mesenchytrceus setosus. In B. udei these ganglia are oblong or 

 pear-shaped and lie close together on the dorsal median line just be- 

 hind the pharynx. Posteriorly they extend into the septal glands, 

 while anteriorly they continue forward into two fibrillar bands, 

 which I take to stand in connection with the main nervous system. 

 These structures do not resemble the peptonephridia of the other 

 genera. 



Br am very different from that of B. ehlerst. The posterior margin 

 is emarginated and the brain is slightly longer than broad. 



Dorsal vessel^ just as in B. ehlersi, rises in somite XII from 

 a fold in the intestine, and does not in any way connect with the 

 intestinal diverticles. There is a heavy blood sinus in the gut in 

 somite V. 



Intestine. — The most interesting part of the intestine is the four 

 diverticles situated in VII. In Ude's original paper ('93) the diver- 

 ticles of the species are described by him as being situated in VII, but 

 in a later ('95) and more elaborate paper this is corrected to VI. In my 

 specimens of B. udei it is not easy to decide upon the somite contain- 

 ing the diverticles, as the tender septa are somewhat ruffled on account 

 of sand in the intestine, but I am certain that they cannot be referred to 

 VI. They are either in VII or in VIII, more probably in VIII. The 

 diverticles are larger than in Ude's species and differ also from it in 

 originating in the posterior part of the somite near the posterior sep- 

 tum. They project forward, being parallel with the intestine and are 

 grown together with the gut in VI, but do not open into it. The 

 diverticles are wider than the intestine between them and of the same 

 structure. They are an-anged latero-dorsally and latero-ventrally. 

 Their inner epithelium is in places much thicker, and is everywhere 

 ciliated. 



Lymphocytes. — These are large, flat, circular or slightly oval, and 

 about one-third as wide as the nephridia. 



Ncphridia. — There are two forms, one with a kind of posterior fold 

 almost separated from the rest, and one with only one rectangular fold. 

 The duct is long, while the anteseptal is very short, consisting merely 

 of the nephrostome. Postseptal duct projects from posterior end. 



Habits. — The label contains no notes as regards the habits of this 

 worm, but the intestine contained fragments of moss and much sand, 

 and there is every reason to suppose that the habits are terrestrial. 



