OCR Text |
Show 34 MR. E. J. MIERS ON CRUSTACEA FROM [Jan. 14, amples of the common P. corrugatus of the European seas. The strigose and hairy carapace, and the form of the frontal lobes, of the teeth of the antero-lateral margins, of the anterior and ambulatory legs, of the male postabdomen, and intromittent organs, are identical in the Japanese specimens and examples of the same size from the Mediterranean. It cannot be doubted that this is also the species described by Stimpson under the name of P. strigilis, and of which M . Alphonse Milne-Edwards, when he published his monograph of the Portunidce, had not seen examples. Goto Island Ojica, at low-water mark; same locality, lat. 33° 12&' N., long. 129° 5' E., at 9 fathoms; also at lat. 32° 49' N., long. 128° 54' E., at 11 fathoms. I am inclined to regard the species described as P. subcorrugatus by A. Milne-Edwards (A. Mus. H . N. x. p. 402, pi. xxxvi. fig. 2), from the Red Sea, as a mere variety cf this species, from which it differs only in the obscure trilobation of the front. There is an example from Naples in the British-Museum collection. Its distribution, therefore, so far coincides with that of the typical P. corrugatus that it is found both in the European and Oriental regions- that is, on either side of the Isthmus of Suez. CoRYSTID-ffi. TRICHOCARCINUS. Trichocera, De Haan, Faun. Japon., Crust, p. 16 (1833). The genus Trichocera, founded by De Haan, appears to be scarcely generically distinct from Cancer, its chief characteristics (and those wherein it exhibits a degradation from the Cancroid type) consisting in its narrower, more convex carapace and longer antennules, on which account it has been placed by Dana and other authors in the Corystidee. It is necessary, if it be retained, to alter its designation, as the name Trichocera had been previously employed (in 1803) for a genus of Dipterous insects. I have therefore slightly modified the termination of De Haan's name, and propose Trichocarcinus for the few species of this group, which includes, besides the two now described, only the Trichocarcinus gibbosulus (De Haan) and Trichocarcinus oregonensis (Dana). TRICHOCARCINUS DENTATUS, sp. n. Carapace smooth, minutely granulated, with the gastric, cardiac, and the middle of the branchial legions convex ; there are two somewhat higher elevations on the gastric and each branchial region. Front five-toothed, the middle one very small, the two outer separated from the rest by a wide interval. Antero-lateral margins with nine, flat, subequal teeth, which are in contact with one another at their bases and broadly triangulate at their apices, and with their margins granulated ; behind the ninth tooth is usually a small tooth on the postero-lateral margin, which is defined by a line of granules. The anterior legs are rather robust; there are three spines on the wrist, on the inner and outer surface, and upper mar- |