REPORT ON THE BRACHYURA. 
91 
Legion II. PARTHENOPINEA. 
Parthenopinea , Dana, U.S. Expl. Exped., vol. xiii., Crust, i., pp. 77, 136, 1852. 
„ Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 641, 1879. 
Basal antennal joint very small and embedded with the next joint in the narrow 
hiatus between the front and the inner subocular angle of the orbit ; the infraocular 
space being mainly occupied by the inferior wall of the orbit. 
Family IV. Paethenopida 
Parthenojpidx , Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. pp. 641-667, 1879. 
Eyes usually retractile within the small circular and well-defined orbits ; the inferior 
wall of the orbit is continued to within a very short distance of the front. The antenna; 
are very slender; the basal joint does not, as in the Periceridse, constitute a great part 
of the inferior orbital margin, but is very small and usually does not reach to the front, 
and with the next joint occupies the narrow hiatus intervening between the front and 
inner subocular angle of the orbit. (In the genus Ceratocarcinus the antennae are com- 
pletely excluded from the orbits.) 
This family presents some affinities with the Oxystomcita, and also as regards 
the structure of the orbits and the position of the antennae with certain genera of the 
Cancridse. 
Subfamily 1 . Parthenopesle. 
Parth'enopinx, Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 668, 1879. 
Carapace equilaterally or transversely triangulate or elliptical. Rostrum simple. 
Strongly-marked depressions exist, separating the branchial from the cardiac and gastric 
regions. Chelipedes greatly developed, with the palm trigonous, fingers acute. 
Lambrus, Leach. 
Lambrus, Leach, Trans. Linn. Soc. Lond., vol. xi. pp. 308, 310, 1815. 
„ Milne Edwards, Hist. Nat. Crust., vol. i. p. 352, 1834. 
,, A. Milne Edwards, Crust, in Miss. Sci. au Mexique, pt. 5, p. 146, 1878. 
„ Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 668, 1879. 
Carapace equilaterally subtriangulate, convex or depressed, with the rostrum usually 
prominent, triangulate and somewhat deflexed, the lateral margins rounded at the 
branchial regions and armed with tubercles or spines, which, on the postero-lateral 
margins are sometimes considerably elongated, orbits small and well defined, with a 
fissure (which is usually closed) in the superior margin, the interior subocular lobe is 
sometimes greatly developed. Epistoma usually transverse. The pterygostomian regions 
(in certain species) are more or' less distinctly rigid, as in the genus Solenolambrus, 
