10 
T. Y. HODGSON. 
single joint and about one-third the length of the entire appendage is present. Its 
apex is provided with a few long setse. The epignath is very small and ovoid. 
The appendages of the mesosome show a transition between the subchelate first 
and the more locomotive posterior ones. The first of these appendages (fig. le) is 
stoutly built, the basis is a little longer than the ischium. The merus is a peculiar 
joint and is short, very much expanded dorsally to embrace the base of the propodus ; 
it bears several long setse ventral!y and two or three at the dorsal extremity. 
The carpus is a small joint, on the inner side of the appendage, apparently 
wedged in between the merus and the propodus. Internally it forms a thin, roughly 
rectangular plate, rather than a joint, which carries a few setse and a couple of spines. 
The propodus is large, rather flask-shaped, with its inner margin expanded as a thin 
plate ; this expansion has a thumb-like process at the inner extremity, and is armed 
near its anterior border with a row of small but highly specialised spines. The 
joint is attached near its middle to the carpus, the rounded base being adapted to 
the crescentic enlargement of the preceding joint. 
The specialised spines are about a dozen in number and are set in distinct sockets, 
and a long seta is associated with each. The structure of the spine is difficult to make 
out, but appears to consist of a stout shaft with a group of stout teeth on one side. In 
some cases one or two teeth are to be seen on the other side of the shaft, but much 
nearer its base. I have not deemed it desirable to injure the appendage in order to 
examine these spines more minutely. The dactylus is long and curved, set at the 
external angle of the propodus, and it carries on its inner margin a small number of 
widely separated setse. 
The second appendage (fig. if) is similar to the first in general structure, the basis 
is, however, proportionately longer and more slender, the merus and other joints are 
also smaller, and the expansion of the propodus which bears the specialised spines is not 
so great and its margin is much more nearly parallel to the axis of the joint. The 
spines themselves are rather longer, the lower portion cylindrical and the upper two- 
thirds tapering to a blunt point. On the posterior side of the shaft about its middle 
there is a series of small teeth, graduating in size from below upwards, i.e., from large 
to small. On the opposite side of the shaft, where the tapering begins, there are one 
or two minute teeth. 
The third appendage closely resembles the previous one, the basis and ischium are 
subequal in length, the latter being more expanded, the remainder of the limb is 
similar but on a smaller scale, and the specialised spines are more uniformly digitiform 
with fewer accessory teeth. In the last appendage (fig. fg) the ischium is very little 
shorter than the basis and is dilated dorsally, the merus is about half its length and 
attains its greatest diameter distally. The propodus is approximately cylindrical, and 
the few spines that it carries only show the minimum of specialisation. 
The metasome in its entirety is a little shorter than the two posterior segments 
of the mesosome. 
