464 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The alimentary canal forms a small but moderately wide open loop. 
The stomach walls have longitudinal folds. These are usually few in 
number (often only about eight or ten) near the esophageal end, but 
most of them fork, or incomplete folds arise between them, so that 
at the pyloric end they are more numerous and more irregular. A liver 
appears to be wanting. The gland surrounding the intestine is well 
developed and covers the outer surface of the intestine for some dis- 
tance on the inside of the bend of the loop. It consists of a complex 
network of crossing and anastomosing tubules whose small branches 
bear minute bulbs. These bulbs lie close against if not partly buried 
in the intestinal walls while the tubules bearing them are more super- 
ficial. The margin of the anus is smooth. 
The kidney is a rather small transparent bean-shaped sac in the 
right posterior part of the body, attached to the mantle. It generally 
contains two or three large dark colored concretions. 
The reproductive organs are situated on the left side of the body 
only, and lie in the bend of the intestine. There is a large, central, 
somewhat flask-shaped ovary, about the border of which (and fol- 
lowing the curve of the intestine) the male organ is situated, the 
latter consisting of numerous small glands which are themselves cleft 
into from two to five or six or more lobes. 
As already stated the writer cannot di\ade this genus into satis- 
factorily distinguishable species. The type of the genus Bostricho- 
branchus, B. manhattensis Traustedt, 1883, from Cape Cod, and a 
species subsequently described by ]Metcalf (1900) from Buzzards Bay, 
9 fathoms, named Herdmania bostrichobranchus (which name he 
changed to Bostrichobranchus molguloides in the latter part of the 
same article) were both described from preserved specimens, and do 
not seem to have any important features distinguishing them from 
Eugyra pilularis Verrill (1871a) or from each other. It is possible, 
however, that Molgida pellucid a Verrill (1872b), which pro\es upon 
examination of Professor Verrill 's specimens also to belong to this 
genus, should eventually receive recognition as a subspecies. Mol- 
gida pelhicida is described by Verrill as follows (1872b, p. 289): 
"Body subglobular with a smooth, thin, pellucid test. Tubes 
terminal, contiguous, much swollen at base, long, divergent, tapering, 
reticulated within by longitudinal and circular white lines (muscular 
fibers). Branchial aperture with six small papillae. Intestine 
conspicuously visible through the test; stomach covered by deep 
