OF THE COASTS OF SOUTH AMERICA. 3) | 
spines, but furnished with three subimbricated processes, directed forwards. Branchial 
regions with about four small spines, of which two are placed near the lateral margin on 
each side; the rest of the body with small scattered tubercles. Rostrum with rather long, 
diverging, acute teeth. The orbits with a very short tooth over the inner canthus. 
Exterior antenne with the tooth of the basilar joint very long, acute, slender, and 
directed forwards and a little outwards. The pedipalps offer no peculiarity. 
The penultimate joint of the abdomen in the male has a small tooth on each side. 
Anterior legs of moderate size and length, the fingers but little curved ; the arm with 
a few short, obtuse, and compressed spines : the remaining feet hairy and spinous above, 
the nails curved and very acute. 
Colour fuscous. 
Length 8 lines ; breadth 7 lines. 
Taken by Mr. Cuming on sandy mud at the Gallapagos Islands, at the depth of seven 
fathoms. 
This and the preceding species belong to the third section of the genus, according to 
Dr. Edwards’s arrangement, with Pisa Sty«, Latr. They are characterized by the greater 
length of the basilary tooth of the antenne, compared with that of the orbit. 
Genus Mirurax, Leach. 
MirTHRAX ROSTRATUS. 
Tabu Xx. Migs1. 
Mithr. testa spinosd, rostro elongato, bidentato, dentibus divaricatis, ad apicem incurvis, 
terminatd ; pedibus spinosis ; manibus levibus. 
Hab. 
3. Mus. Bell.— 2%. Mus. Soc. Zool. 
Carapax rounded, anteriorly produced, moderately elevated, the regions distinct ; 
surface granulated, tuberculous, and with the margins and outer part of the branchial 
regions spinous. Rostrum much longer than broad, consisting of two strong diverging 
teeth, the apices of which are a little inclined. Orbit nearly circular, surrounded with 
warty tubercles. Eyes globular, smaller than the base of the peduncles. 
Interior antenne lodged in a fossa, which is divided only at the anterior half by a 
projecting tooth-like process. Exterior antenne rather longer than the rostrum ; the 
basilar joint with a small tuberculated tooth at the outer edge ; second and third joints 
rather broad, and furnished with long hairs on each side ; fourth joint cylindrical and 
elongated. Pedipalps as in most other species of the genus. 
Abdomen of the male slightly and obtusely carinated ; of the female nearly orbicular. 
Anterior feet of the male moderately robust, of the female rather slender ; the move- 
able finger in the former sex with a tubercle near the base; hand smooth, the other 
joints spinous and tuberculated. Remaining feet spinous and tuberculated, excepting 
on the last two joints, which, like the others, are hairy. ‘The nails in the male are fur- 
H 2 
