OF THE COASTS OF SOUTH AMERICA. 61 
The abdomen of the female is oval, seven-jointed, and has an obtuse interrupted carina 
running its whole length, formed by a tubercle on the centre of each joint: the first 
joint has a small tooth. 
The legs are without spines, but covered with close hair ; the first pair in the female 
is not larger than the others, and shorter than the second and third, which are the 
longest of the whole. The hand is simple, naked, and slender ; the claw small and fur- 
nished with extremely minute teeth. 
The colour is a rich, rather light, reddish brown. 
Length 1 inch ; breadth 6 lines. 
Two specimens, both females, were dredged by Mr. Cuming at the Gallapagos Islands 
on coral sand at the depth of six fathoms. 
PERICERA HEPTACANTHA. 
Tab. XII. Fig. 6. 
Per. testd pyriformi, dorso quinque-spinoso, ordine 1—3—1, lateribus utrinque unispinosis ; 
rostri cornibus parvis, acutis. 
Hab. ad Americe Centralis oras. (Puerto Portrero.) 
g Mus. Soc. Zool.— 9 Bell. 
The carapax of this species is broader in proportion to its length than in most others 
of the genus, contracted forwards, and considerably elevated. It is moderately covered 
with close short hair, longer towards the fore part, and has seven large spines, of which 
one is placed on the genital region, one on the cardiac, one on the intestinal, one on 
each branchial, and one on each side beneath the latter; they thus form a cross, of 
which that on the cardiac region forms the point of intersection. The two branchial 
and the intestinal spines are a little recurved. The orbit, as in all the species of this 
section, is furnished above with a long tooth, which is recurved. The eyes project but 
little beyond the orbit. The rostrum is small, occupying not much more than one third 
of the distance between the external margins of the orbits ; the cornua are as long as 
the breadth of the rostrum, acute, styliform, and divergent. 
The external antenne have the basilar joint moderately broad, with the external tooth 
shorter than that above the orbit ; there is a small tooth beneath the former, and the 
tooth which goes to form part of the inferior margin of the orbit is long, acute, and la- 
minated. The moveable portion of the untenne is setaceous, as long as the rostrum, and 
furnished with a few hairs. 
The second joint of the inner footstalk of the external pedipalps is quadrate and 
emarginate at the anterior and inner angle. 
The abdomen of the male is rather prominent ; the second joint has.a small central 
tubercle, the third three slight elevations, the sixth, which is the longest, has a central 
tubercle, and on each side a minute projection ; the seventh is rounded anteriorly. The 
abdomen of the female is broad, rounded, and has a broad obtuse carina. 
