ORDER DECAPODA — LITHODES. 17 
(EXTRA-LIMITAL.) 
Genus In1a, Leach, Shield oval or circular. Anterior feet very long, slender, and terminating in long 
filiform fingers. 
FE. punctata. (Envw. Vol. 2, p. 125. Leucosia id. Say, loc. cit. p. 457.) Shield with three long 
conical teeth behind, directed backwards. Surface granular, terminated by a granulated margin, 
Coast of Georgia and Florida. 
Genus Heparvs, Latredlle. Shield broad, arched in front, narrowed and truncated behind. External 
antenne short; the four posterior pair of feet terminated by a small pointed tarsus. 
H. fasciatus. (Desmarest, Consid. pl. 9, fig. 2. Say, loc. cit. p. 457.) The antero-lateral mar- 
gin of the shield divided into 12 — 13 more or less rectangular teeth, which are dentated on their 
edges. Color, variable, yellowish; in the young, banded; in the adult, maculate with reddish 
spots, Coast of Georgia and Florida, 
GENUS LITHODES. Latreille. 
Shield cordiform, tubercular ; the rostrum elongated. Eyes approximated, with the four 
short antenne between them. The first four pair of feet successively longer ; the fifth pair 
very short and rudimentary. 
Oss. This genus is one of a group which forms the transition between the Decapoda bra- 
chyura and the D. macroura. It constitutes the section Decapodes anomoures of Milne- 
Edwards. Of the genus Lithodes, we have as yet but one representative on our coast. 
LirHopEs arctica. 
PLATE VI. FIG. 11. 
Cancer maia. Lin. Syst. Nat. p. 1046. 
Dithodes arctica. LATREILLE, Genera, Vol. 1, p, 40. 
LL. maja. Leacu, Zool. Miscell. Vol. 1, p. 40. Lam. Vol. 2, p. 414. Ed, Brux. 
L, arctica, LAT. in Griffith’s Cuvier, Vol. 13, p. 172, pl. 1, fig. 1. 
L. id. MILNE-HDwarps, Hist. Nat. Vol. 2, p. 186. Gouxnp, Invertebrata of Mass. p. 327. 
Description. Shield heart-shaped, covered with conical tubercles, and a series of large 
pointed spines along its lateral margins; the rostrum elongated, slender, bifid, or with two 
slightly diverging points at the end, two pair of lateral teeth, and one above, and the other 
larger one beneath the rostrum. Second joint of the external antenne with a tooth on its 
outer surface. Pincers with tufts of hairs. All the feet, except the last pair, with series of 
stout spines. 
Length, 4°0. Transverse diameter, 3°5. 
This is a boreal species, very common on the coast of Norway. On our coast it is very 
rare. Dr. Gould obtained, through Dr. Prescott of Lynn, a specimen from the stomach of a 
codfish on the coast of Massachusetts ; and, under similar circumstances, it may present 
itself to the naturalists of this State. 
Fauna — Part 6*, 3 
