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 echinatus, 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 (Ckorilia) japonicus, and Telmessus acutidens, 

 Stm., may, upon further comparison, prove to be identical with their 

 American congeners. 



BRACHYURA. 



OXYRHYNCHA vcl MaIOIDEA. 



Maiid^. 

 pugettia quadridens. 



JMencBthius quadridens, De Haan, Faun. Japon. Crust, p. 97, 

 pi. xxiv. fig. 2, S {Halimus), and pi. G (1839). 



Pugettia quadridens, Stimpsou, 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 extre- 

 mity. 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. 



Mencethivs incisus, De Haan, Faun. Japon. Crust, p. 98, pi. xxiv. 

 fig. 3, 2 {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 mud and hard sand) ; Corean Channel, 

 lat. 33° 10' N., 129° 12' E., at 36 fathoms. 



This and the preceding species were previously unrepresented in 

 the British-Museum collection. 



