80 
CRUSTACEA. 
Genus OCYPODE, Fair. 
4. Ocypode URVILLII. Guerin, Zoologie de la Coquille, Allas, Crusiaces, 
pi. 1 . fig. 1 . 
The descriptions of the Crustacea in the Zoology of M. Duperrey’s voyage being still unpub- 
lished, I subjoin the following account of this species. 
The carapace is ten lines in length, and twelve in breadth, convex, granulate, with a canalicu- 
late margin. The rostrum is narrow, inclined, and rounded anteriorly; on each side ofit are two incisures 
in the front of the carapace, lodging the eyes and their peduncles ; the iatter project slightly beyond the 
eyes, which are very large. The cubiti are dentated at the inner margin; the manus of the left chela, 
which is the largest in the specimen, is serrated at the outer margin ; the digits are dentated inter- 
nally, and are marked with longitudinal lines. The claws are compressed, and transversely striated. 
The habitat of the specimen was marked “ Low Islands of the Pacific Ocean.” 
Genus GRAPSUS, Lamarck. 
5. Grapsus thukuhar. n. s . 
Grapsus clypei lateribus striatis ; humeris, ulnis, carpisque interne spinosis; femoribus supra et subtus spinosis. 
Long.clypei, I'm. 13. lat.lin. 15. 
Color, fulvus brunneo-punctatissimus. 
The carapace of this species is broadest in front; the sides slightly converging to the posterior 
angles, which are truncated. The rostrum is very broad, is inclined, and supports four prominences, 
of which the lateral are the largest. The sides of the carapace are without notches or dentations, but 
the anterior angles are produced and acute ; there are oblique lines over the branchial regions. The 
chela; are equal, short, obtuse ; the humeri have two spines ; the cubiti have their inner margins 
dilated and armed with spines; the carpi have also one or two spines at their inner aspect; each 
manus is slightly tuberculated at the inner and upper part, but elsewhere is smooth and elegantly 
mottled with purple. The claws are compressed ; the femora have a single spine above, and two 
beneath, at the distal extremity; the other joints are hirsute, the penultimate and terminal ones being 
also armed with fine small spines projecting distad, and which must be of some service in progression, 
by preventing the claws penetrating too deep in the sand. The colour of this crab is a dull yellow, 
sprinkled closely all over with minute brown spots, like the skin of Sepia officinalis. 
The specimen was captured by Mr. Lay at Oahu ; where it is known among the natives under 
the denomination “ Thukuhar ,” which I have therefore retained as the “nomen triviale” of the 
species. 
Plate XXIV. Fig. 3. Grapsus Thukuhar. 
3 a. Chela sinistra. 
Section CRYPTOPODA, Lair. 
Genus CALAPPA, Fabr. 
6. Calappa tuberculata. Fabr., Entom. Suppl. p.345. fig. Herbst, Krabben 
taf . 13. fig. 78. mala. Desmarest, Considerations sur les Cruslacts, pi. 10. 
fig. 1. la. 
This species inhabits, according to Lamarck, the Atlantic Ocean. Fabricius, who described the 
species from the Bauksian cabinet, and after him Herbst, consider it a native of the Pacific Ocean. 
The present specimen was taken at Oahu, Sandwich Isles. It is called by the natives, Papahi. 
