117 
spine, representing the posterior or outer angle of tlic orbit ; 
the preceding one I have called the intermediate spine of the 
upper orbital margin. In I'drdinifli rd.r, Schizo'phrys, etc., 
these parts are well shown, but liav^e become, as it were, 
squeezed together to form a more complete orbit ; but in the 
species of T/alimriM under consideration the spines are dis- 
tant, the posterior portion of the orbit being a widely open 
space. 
Within the genus itself the arrangement of these parts 
is useful for classification, the anterior arcuate portion being 
spiniform, dentiform, tuberculate, or merely rounded at the 
anterior or posterior end, and the two succeeding spines in 
different degrees of development, and relationship. 
If (111 or modes roppinr/e?'!, Haswell, be examined, these 
parts will be seen to be much exaggerated in shape. 
Also, in the interocular space on each side, near the orbital 
margin above, there is in these species of Tlnlimv^ a tubercle 
with a more or less distinct ridge extending from it on to the 
rostral horn ; these elevations are supplied plentifully with 
the curled corneous bristles so much in evidence amongst 
these crabs. In the same species of Chloinnodes mentioned 
above this ridge is very distinct : it is also shown in Para- 
mithracc and others. 
Again, in the species of Halimus under consideration a 
more or less papilliform tubercle is situated on the sub- 
hepatic region : in B . t run rati pes this is somewhat anvil- 
shaped and very distinctive. 
In the cardiac region of HaJimits are usually seen a pair 
of tubercles showing a tendency to coalesce, represented in 
the species of GhJorinodes again by a lamellar, bifid struc- 
ture which is very prominent. 
Lastly, in these allied species, the chelipeds of the males 
are subject to great variation as to size, their enlargement 
apparently taking place well on in the life of the animal, as 
in some specimens they scarcely exceed those of the female. I 
would instance the case of Lepiom%thra:r sj)midosus, Haswell, 
where certain males — doubtless adults* on account of size 
and being covered by much of the usual foreign matter — 
have the chelipeds little if at all exceeding in size and shape 
those of the female, while in others they are massive, with 
the fingers very unsymmetrical. In Schizophri/s a. ^ pern some- 
what similar conditions obtain. 
In these four species of Bnlinuis the normal chelipeds 
scarcely differ : in all, the hands become slightly narrower 
distally in the vertical direction, and are more or less pro- 
vided with scattered punctations, from which fasciculi of 
hairs arise. 
