1879.] THE COREAN AND JAPANESE SEAS. 55 



brevirosfris, Olivier, and A. lohidens, De Haan, and the A. malaba- 

 ricus and A. rapax, Fabricius, as described and figured bj^ the latter- 

 mentioned author in the 'Fauna Japonica.' From the A. breviros- 

 tris it differs in the absence of crests upon the upper surface of the 

 Iftrger hand, the finger of which is proportionally much longer, and 

 nearly straight, and from the three other species in the absence of 

 ridges on the outer and inner surface of the palm, and of spines at 

 the distal extremity of the arm, &c. It is evidently very nearly 

 allied to A. rapax, which, however, is described (De Haan, /. c.) as 

 having " manus major glabra 4-costata, brachia carhia superiore 

 apice unispinosa." 



I dedicate this species to Mr. J. S, Kingsley, of Salem, U. S., who, 

 by his recent researches, has greatly facilitated the determination of 

 the American species of this genus. 



AlPHEUS GRACILIPES? 



? Alpheus gracilipes, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 31 

 (1860). 



I refer to this species with some hesitation a small individual 

 collected in lat. 32° 49' N., long. 128° 54' E. It agrees in all parti- 

 culars with Stimpson's description, based on a specimen from Tahiti, 

 except that the orbits can scarcely be called acute in front, and the 

 penultimate joint of the ambulatory legs is about 6-spined below. 

 I may add that the larger hand is sparsely pilose and slightly twisted, 

 the mobile finger about one third the total length of the hand. The 

 smaller hand is wanting in the specimen. 



Rhynchocyclus planirostris. 



Cyclorhynchus planirostris, De Haan, Faun. Japon., Crust, p. 1/5, 

 pi. xlv. fig. 7 (1849). 



Ithynchocyclus planirostris, Stimpson, Proc. Ac. Nat. Sci. Phil, 

 p. 27 (1860). 



Rhynchocychis mncronattis, Stimpson, I.e. p. 28 (1860), var. 



One adult female, with ova, was collected at Cape Sima, Nippon, 

 at a depth of 18 fathoms, on a bottom of sand and broken shells, 

 and one, apparently male, in the Gulf of Yedo. It is to be noted 

 that in neither specimen is the wrist carinated above and spinose at 

 apex, as in De Haan's description. In all other respects the female, 

 however, agrees with the description and figure of that author. 

 The second specimen, in the somewhat narrower longer rostrum, 

 and the existence of but a single spine on the dorsal surface of the 

 carapace, agrees with Stimpson's diagnosis of R. mueronatus, which 

 was based on specimens collected in the Strait of Ly-i-moon, near 

 Hong Kong ; but the denticles on the anterior margin of the ros- 

 trum are more numerous in both individuals. In both, moreover, 

 exist the spines on the anterior margin of the carapace, mentioned 

 by Stimpson ; and in both the joints of the wrist are of the same 

 proportional length, t. e. the second longer than either the first and 

 third. It is probable that Stimpson's species is at most a mere 



