58 Crustacea and Echinodermata of the 



Hippolyte in its long elevated rostrum and inflexed abdo- 

 men. The carapax is everywhere spinous. 



Hab. Puget Sound, (Expl. Exped.) 



Mus. Expl. Exped. 



ATYA SCABRA. Leacll. 



Atya scabra, Leach ; Zoiil. MisceJ. v. iii. PI. CXXXI. Milne-Edwards ; Hist. 



Nat. des Crust, ii. 348. PI. XXIV. f. 15-19. Newport; An. and Mag. Nat. 



II, st. 1847, xix. 159. 

 Atya Mexicana, Wiegmann; Archiv filr Naturgeschichte, 1836, i. 145. 



The specimens in the Museum of the Smithsonian Insti- 

 tution from the fresh waters of Western Mexico agree in 

 all their characters with the description given by Wieg- 

 mann of his A. Mexicana, while they are exactly repre- 

 sented by the published figures of A. scabra. Under these 

 circumstances, I have ventured to cite Wiegmann's name 

 as a synonym. Milne-Edwards considers A. scabra to be 

 a marine form, but there is great doubt that any species of 

 the genus is found in the sea. 



Hab. Misantla, (Deppe ;) Western Mexico, (Mus. Smith- 

 sonian.) 



Mus. Phil. Acad. ; Smithsonian ; Paris ; Berlin ; Brit. 

 Mus. 



11I1T0LYTE AFFINIS. Owen. 

 Hippolyte affinis, Owen; Zoiil. of Beechey'a Voyage, 90, PI. XXVII. f. 4. 



Hab. Monterey, (Capt. Beechey.) 

 Mus. R. C. S. ; ZooL Soc. 



HIPPOLYTE LAMKLLICORNIS. Dana. 



Hippolyte lamellicornis, Dana ; U. S. Exploring Expedition, Crust, i. 567. 

 PI. XXXVI. f. 6. 



This species is very closely allied to H. Ochotensis, 

 Brandt, and to H. ajfiuis, Owen. From the latter it ap- 

 pears to differ in wanting teeth on the inferior side of the 

 rostrum. 



Hub. Straits of De Fuca, (Expl. Exped.) 



Mus. Expl. Exped. 



