34 MR. E. J. MIERS ON CRUSTACEA FROM [Jan. 14, 



amples of the common P. corrugahis 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 postahdomen, 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° 

 12i' 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. suhcorrugatus 

 by A. Milne-Edwards (A. Mus. H. N. x. p. 402, pi. xxxvi. fig. 2), 

 from the Red Sea, as a mere variety of this species, from which it 

 differs only in the obscure trilobation of the front. There is an ex- 

 ample from Naples in the British-Museum collection. Its distribu- 

 tion, therefore, so far coincides with that of the typical P. corruga- 

 tus that it is found both in the European and Oriental regions — 

 that is, on either side of the Isthmus of Suez. 



corystid^. 

 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 

 Corystid(B. It is necessary, if it be retained, to alter its designa- 

 tion, as the name Trichocera had been previously employed (in 

 1803) for a genus of Dipterous insects. 



I have therefore shghtly modified the termination of De Haau's 

 name, and propose Trichocarcinus for the few species of this group, 

 which includes, besides the two now described, only the Trichocar- 

 cinus 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 regions convex ; there are two some- 

 what higher elevations on the gastric and each branchial region. 

 Front five-toothed, the middle one very small, the two outer sepa- 

 rated 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 

 Bpiues on the wrist, on the inner and outer surface, and upper mar- 



