At MR. T. BELL ON THE CRUSTACEA 
points, and are furnished with rounded tubercles. In the present genus the anterior 
legs are shorter than the posterior, and very slender ; in Herbstia they are much longer 
than the others and very robust. One species only is known of the genus, of which 
but a single specimen exists in the collection formed by Mr. Cuming. 
Ra#opDIA PYRIFORMIS. 
Tab. IX. Fig. 1. 
Hab. ad Insulas Gallapagos dictas. 
3. Mus. Soc. Zool. 
Carapax pyriform, somewhat depressed, the regions slightly and evenly elevated « 
rostrum about as broad as it is long, small, consisting of two pointed teeth: lateral 
margin with four distant, minute teeth : posterior margin produced. Orbits large, with 
a triangular hiatus above, and a tooth at the outer and inner canthus. Eyes large, 
globose, fixed on very short peduncles, which are small at their junction with the eyes, 
but larger at their insertion into the orbit. 
Internal antenne lying in deep, circumscribed, longitudinal, somewhat lunulate ca- 
vities. External antenne twice as long as the rostrum, the basilar joint broad, biden- 
tate, the outer tooth being the shortest, and placed further back, at the inner canthus 
of the orbit. The pedipalps were so much injured in the specimen as not to admit of 
description. 
Abdomen of the male seven-jointed, decreasing in breadth from the third joint to the 
last. 
The anterior pair of feet rather thicker but shorter than the others ; the arm and 
wrist hairy and beset with small spines; the hand hairy above, but without spines.: 
the fingers are slender, and are in contact throughout their whole length, and the mar- 
gin is very minutely serrated. The remaining feet are longer than the carapax, the 
second pair by nearly one third ; the remainder diminishing gradually to the fifth. They 
are nearly cylindrical, hairy but without spines or tubercles, and terminate in a small, 
slightly curved claw. 
_ The colour of the only specimen known is pink, the hairs brown ; the legs are whitish 
with pink annuli or bands ; but as the specimen is considerably bleached and injured, 
it is impossible to judge of the natural colour. 
Length of the carapax 8 lines ; breadth 6 lines. 
A single male specimen only, probably immature, was procured by Mr. Cuming, at 
the depth of six fathoms, on coral sand. It had evidently been long dead. 
Genus Petia. 
Testa pyriformis, rotundata, anticé rostro elongato, apice bifido, terminata. 
Orbita supra fornicata, externé unifissa, infra emarginata. 
