PARALOMIS. 45 
species is congeneric with Echinocerus cibarius White.* He therefore proposes 
to treat Paralomis as a synonym of Echinocerus in a paper soon to be published. 
The two “Challenger” species referred to Paralomis by Professor Hender- 
son ¢ are, as Mr. Benedict points out, generically distinct from P. granulosa. 
In the latter the ambulatory appendages are comparatively short (not very 
much longer than the chelipeds) and are tucked in underneath the body 
during repose, while in Henderson’s species the ambulatory legs are very 
long (much longer than the chelipeds) and are not capable of folding com- 
pactly beneath the body. 
After a careful examination of Paralomis granulosa 1 am disposed to 
recognize the genus Paralomis as distinct from Lchinocerus, and furthermore 
to assign Lehinocerus diomedee of my preliminary report to Paralomis. In 
Echinocerus as exemplified either in the type species, £. ebarius, or in L. 
Joraminatus Stimps., the ambulatory legs are about the same length as the 
chelipeds and fall below the lateral dimension of the carapace; not only do 
all the legs fold under the body but their segments are so modified that in an 
attitude of repose all of the opposed surfaces and edges are fitted together 
with admirable nicety, and the animal is boxed up as effectually as a tortoise 
in its shell. The dactyle of the left cheliped shuts over the dactyle of the 
right as in Calappa and, as in that genus, the immobile fingers are shortened 
and bent down so that their cutting edges are nearly at right angles with 
the long axis of the chelx ; the outer edge of the left dactyle fits throughout 
its whole length exactly against a tuberculous ridge along the anterior bor- 
der of the right hand. The antero-inferior angle of the merus is bevelled off 
for the reception of the chela when flexed, so that the exposed face of the 
chela is then on a level with the Hat expanse formed by the sternal plastron 
and the bases of the ambulatory legs. Furthermore, a special process devel- 
oped on the anterior border of the basal segment of the chelipeds locks the 
tips of the chelipeds to the sternum when those appendages are folded in. 
In order that the ambulatory legs when flexed may not project below the 
level of the sternal plastron, their meral segments are set at an angle with 
the ischia, whose inferior distal borders are raised into prominent ridges. 
The propodites and dactyli, when folded, impinge on these ridges, but hardly 
project beyond them. 
* Proc. Zodlog. Soc. London, XVI. 48, 1848. 
$ Paralomis aculeata Hend., Rep. Challenger Anomura, p. 45, Pl. V. Fig. 1, and P. formosa Hend., 
op. cit. p. 46, Pl. V. Fig. 2. The two species assigned to Para/omis in my preliminary report, P. aspera and 
P. longipes (Bull. Mus. Comp. Zodl., XXIV. 164, 165) belong to the aculeata group, which Mr. Benedict 
proposes to call Leptolithodes. 
