94 Brcmchipus, 
pers grooved on inner side near the tip, and terminally tridentate 
rather than bifid, there being a third process which is situated on 
the anterior edge of the tip of the clasper ; this process rounded in- 
stead of pointed. Female characterized by a structure that could hard- 
ly have been overlooked had it been present in B. hundyi. This con- 
sists of two prominent processes of a conical form that grow out 
from the dorso-lateral surface of the tenth thoracic segment, one 
on each side, and project backward, across the eleventh segment 
and for a short distance on the segment that contains the genital 
organs. The posterior ends of these processes stand out free 
from the body. The ninth segment with a similar but much small- 
er process on each side, which overlaps the one on the tenth seg- 
ment. Ovisac about as broad as long and with a prominent medi- 
The function of these dorsal outgrowths is not known to us. 
It may be suggested that they furnish means for the male to retain 
firm hold of the female. The claspers of this species are far less 
powerful than are those of B. vernalis and may not be alone equal 
to the task imposed on them. Possibly the rounded tubercle 
found at the base of the second joint of the claspers is applied to 
the processes on the back of the female and hold retained by 
means of the minute suckers on the tubercles. 
In order to ascertain the nature of the outgrowths found on the 
females, consecutive series of sections were cut from hardened and 
stained specimens. The organ in question is, of course, bounded 
outwardly by a chitinous wall ; but it is also, at most points, dis- 
tinctly separated from the rest of the body by another wall of chit- 
in. This is, however, incomplete, so that the cavity of the process 
is in communication with the cavity of the body. From the interior 
wall there radiate outward to the external wall a great number of 
bands or trabeculae also apparently of chitin. These bands,as they 
pass outward, divide and anastomose so that the interior of the 
process is divided into communicating cells. Where the process 
frees itself from the body these bands soon cease to be seen. For 
some little distance behind the points where the processes leave 
the body there is found, along the middle of the back, the double- 
wall arrangement, with chitinous bands running from the inner 
wall to the outer. In the meshwork of chitinous bands, especially 
of the processes, there are found numerous small nucleated cells or 
corpuscles. The extremities of the processes are filled with these. 
