OF THE COASTS OF SOUTH AMERICA. 49 
Taken by Mr. Cuming at the Gallapagos Islands in sandy mud at the depth of seven 
fathoms. 
Genus Hyas, Edw. 
Hyas Epwarpsil. 
Tab. IX. Fig. 5. 
Hy. testa antice angustatd, post orbitas haud coarctatd, pilosa ; orbitarum dente interno 
mediocri ; abdominis (maris) articulo penultimo utrinque unidenticulato. 
Hab. apud Valparaiso et ad Insulas Gallapagos dictas. 
Mus. Soc. Zool., Bell. 
Carapax pyriform, elevated, posteriorly rounded, anteriorly narrow, but without a 
distinct contraction behind the orbits ; covered with brown hair. Rostrum formed of 
two elongated compressed teeth slightly converging at the apex. Orbits spacious, with- 
out spines, having a triangular tooth of moderate size at the outer canthus. Eyes globu- 
lar, larger than their peduncles. 
Interior antenne lodged in a fossa at the base of the rostrum, which is open anteriorly, 
and undivided. Exterior antenne longer than the rostrum, very hairy, the basilar joint 
with raised margins ; the second and third less expanded than in the other species of 
the genus. The pedipalps offer no peculiarity. 
Abdomen of the male with the penultimate joint with a small tooth on each side. 
Anterior legs in the adult male rounded, the hand much thicker than the arm, and 
terminated by curved fingers, which touch each other only at the ape, which is ser- 
rated; moveable finger with a single tubercle near the base. In the female the hands 
are scarcely larger than the arms, the fingers are less curved, and there is no tubercle. 
The remaining legs are somewhat flattened above, obtusely carinated beneath, and very 
hairy: the second pair is the longest, and they diminish regularly to the fifth. 
Colour reddish brown ; the hands red. 
In size the specimens from the two localities differ exceedingly. There are adult 
males from the Gallapagos Islands, of which the length is 6 lines and the breadth 
4 lines. From Valparaiso I have examined a specimen of an immature male, as ap- 
pears by the want of development of the anterior feet, the length of which is 9 lines 
and the breadth 7 lines. This remarkable discrepancy led me at first to expect that I 
should discover some specific differences ; but the most careful examination has con- 
vinced me that they are all of one species. 
VOL, II. H 
