60 MR. T. BELL ON THE CRUSTACEA 
consisting of two flattened, rather obtuse, diverging horns, which are nearly as far apart 
at the apew as the distance between the eyes. 
The abdomen in the male consists of seven segments, each elevated in the centre into 
a tubercle, forming a sort of interrupted obtuse carina: in that of the female the seg- 
ments, which are also seven, have each three elevations, producing a kind of tessellated 
appearance of the whole. 
The feet are covered with extremely short hair. The anterior pair in the male is 
rather larger than the others, though less so than in Per. heptacantha. The fingers meet 
only at the extremities, though they approximate throughout their length more nearly 
than in some other species. The nails of the other feet are robust and somewhat curved. 
The colour of the male is a brown red, the latter colour predominating on the outer 
surface: that of the female is a darker brown without any admixture of red. 
Length 1 inch 7 lines ; breadth the same, including the Jateral spines, each of which 
measures 3 lines. 
Three specimens, an adult male, and an adult and an immature female, were obtained 
by Mr. Cuming in the bay of Guayaquil, on sandy mud, at the depth of eleven fathoms. 
PERICERA OVATA. 
Tab. XII. Fig. 5. 
Per. testd elongato-ovatd, spinis viginti ad viginti quatuor armatd; dente superorbitali dente 
articuli basilaris antenne externe longiore. 
Hab. ad Insulas Gallapagos dictas. 
? Mus. Soc. Zool., Bell. 
The carapax of this species is oval, longer in proportion to its breadth than in many 
others, considerably elevated, at least in the female, the only sex as yet observed, 
sparingly covered with short close hair, and furnished with numerous spines, of various 
length and size, of which there are four small ones on the median line of the gastric 
region, three on the cardiac and genital, of which the middle one is the largest, one on 
the intestinal, a very small one on each hepatic, three on the branchial, and four or five 
on each lateral margin. The orbit is formed nearly as in the other species, the upper and 
anterior spine extending much beyond that of the basilar joint of the external antenne. 
Between this spine and the outer one is a fissure, and below a considerable hiatus 
bounded by the basilar joint of the antenne. The eyes are rather larger than their 
peduncles, and extend beyond the margin of the orbit. The rostrum is formed of two 
diverging horns, and has a depression at their base. 
The basilar joint of the external antenna is very broad ; its outer spine is short and 
triangular, and there is a very small tooth beneath the insertion of the second joint. 
The moveable portion is as long as the rostrum, and beset with a double series of bristles. 
The second joint of the internal footstalk of the outer pedipalps is triangular, the ante- 
rior margin rounded, and scarcely notched. 
