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Show 1879.] THE COREAN AND JAPANESE SEAS. 23 found elsewhere, and are peculiarly characteristic of the Pacific coasts of America. Some, having a boreal range (Echidnocerus, Hapalogaster), evidently pass from one continent to the other via Behring's Straits; but instances are not wanting (although rare) of forms which have never been shown to have a boreal range occurring on both coasts of the Pacific. An example occurs in the present collection in the curious Shrimp Paracrangon eehinatus, Dana, in the case of which I have satisfied myself, by actual comparison, of the identity of examples from Puget Sound, California, and Yedo Island. Hyastenus (Chorilia) japonicus, and Telmessus acutidens, Stm., may, upon further comparison, prove to be identical with their American congeners. BRACHYURA. OXYRHYNCHA vel MAIOIDEA. MAIID^E. PUGETTIA QUADRIDENS. Menadthius quadridens, De Haan, Faun. Japon. Crust, p. 97, pi. xxiv. fig. 2, tf (Halimus), and pi. G (1839). Pugettia quadridens, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 219 (1857). This species is very closely allied to the Pugettia gracilis, Dana (U.S. Expl. Exp. xiii. p. 117, pi. iv. fig. 3, 1852), from the Cali-fornian coast; but the lateral lobes or expansions of the carapace are less broad and triangular in shape, and more acute at the extremity. In the females the carapace is more convex than in the males, with the hepatic regions more convex. Otarranai, 5| fathoms, lat. 43° 12' N., long. 141° 1' E.; Isenomi Straits, low-water mark; Corean Channel, lat. 33° 12^' N., long. 129° 5' E., 9 fathoms. Males, females, and young were collected. Stimpson's specimens were from Simoda, Japan, and Hong Kong. PUGETTIA INCISA. Mencethius incisus, De Haan, Faun. Japon. Crust, p. 98, pi. xxiv. fig. 3, ? (Halimus), and pi. G (1839). Pugettia incisa, Stm. Proc. Ac. Nat. Sci. Phil. p. 219 (1857). Three specimens, males, all of small size, were obtained of this species, which differs from its congeners in the auriculiform shape of the first pair of lateral expansions of the carapace, in which it exhibits some affinity with the genera Hyas and Hyastenus, from the first of which it differs in the slender divergent horns of the rostrum, and from the second in the far less perfectly defined orbits. Although the basal joint of the antennae is somewhat broader, the structure of the antennal and orbital regions is essentially that of Pugettia. Gulf of Yedo (bottom soft m ud and hard sand) ; Corean Chaunel, lat. 33° 10' N., 129° 12' E., at 36 fathoms. This and the preceding species were previously unrepresented in the British-Museum collection. |