48 MR. T. BELL ON THE CRUSTACEA 
manibus levibus, digitis arcuatis, ad apicem tanttm contingentibus: posteriores 
depressi, lateribus pilosis. 
Abdomen in utroque sexu 7-articulatum. 
This genus, founded on a single known species, approaches Herbstia in the character 
of the antenne, the hands, the claws, and some other parts; but it differs materially 
from that genus in the form of the rostrum, the depressed and horizontal form of the 
body, and from every other genus in the remarkable excavations on the upper and outer 
sides of the arm. Its natural situation in the system is probably between Herbstia and 
Hyas. The genera, however, constituting the Maiens of Dr. Milne Edwards, require a 
thorough examination, in order to ascertain the real value of the characters upon which 
generic distinctions have hitherto been founded. 
THOE EROSA. 
Tab. IX. Fig. 4. 
Hab. ad Insulas Gallapagos dictas. 
Mus. Soc. Zool., Bell. 
Carapax somewhat triangular, longer than it is broad, rounded behind, depressed, 
horizontal, covered with low tuberosities ; the lateral margin without teeth, perpendicu- 
lar. Rostrum minute, tapering to the point, which is slightly divided. Orbits nearly 
round, without teeth, with three small fissures, one above the inner canthus, another at 
the outer angle, and the third beneath. Eyes subretractile, globose, smaller than the 
base of the peduncle. 
Internal antenne lodged in a fossa, which is anteriorly divided by a tooth projecting 
backwards and longitudinally excavated. External antenne with the basilar joint very 
broad, produced forwards and backwards, the moveable portion three times as long as 
the rostrum, ciliated on the inner side. External pedipalps with the outer footstalk ex- 
panded at the outer margin ; first joint of the inner footstalk nearly rhomboidal, with 
entire margins, ciliated on the inner margin ; second joint without any emargination for 
the insertion of the palp. 
Abdomen in both sexes seven-jointed. In the male, the third to the sixth joints are 
scarcely broader than the first and second. 
Anterior legs in the male longer and much more robust than the remainder. The 
arm with a series of quadrilateral excavations on the upper and outer surfaces diminish- 
ing backwards. Hands smooth, carinated beneath, the fingers meeting only at the point, 
not excavated or serrated, but with a single tubercle near the middle of the moveable 
finger: remaining feet flattened above, longitudinally rugose, the sides furnished with 
rather long hairs; beneath rounded and smooth. 
Colour light yellowish brown above, paler beneath. 
Length 6 lines ; breadth 5 lines. 
pe ages 
