KINGSLEY ON THE GENUS ALPHEUS. 199 



fifth slightly longer 5 chela about as loug as the two preceding joints. 

 Telsou slender, tapering; extremity regularly rounded. 



This species differs from the description of Betceus eqimnanus Locking- 

 ton in having the peduncles of antennae and antennulse nearly equal, 

 the relative lengths of the antenuular flagella, and the shape of the 

 fingers of the hirger hand, which are not straight on the occludout 

 margin. 



Santa Barbara, Cal. ( W. G. W. Harford), 4 specimens. Catalina Island, 

 Cal. ( TF. O. W. Harford), 3 specimens; under the mouth of Haliotis ru- 

 fescens Swains. . 



Length of body. Carapax. Larger hand. Larger dactylus. 

 24.0""™ 8.0™"" 8.0™™ 4.7™™ 



19.0 6.0 6.0 3.6 



Of the following species I have not seen specimens : — 

 Alplieus helUmanus, Lockington, I. c. Feb. 7, 1876. 



This appears to be near the transversiis of this paper. Lockington's 

 specimens came from San Diego, Cal. 



Alplieus equidactyliis, Lockington, I. c. Feb. 7, 1876. 



From Monterey, Cal. The extremely short description applies per- 

 fectly to A. lieterochelis. 



Alpheus lispinosus, Streets, Proc. Phila. Acad. iSTat. Sci. 1872, 242. 



The description applies very well to A. heterochelis. The specimens 

 came from the Isthmus of Panama, but from which coast is not known. 



Alpheus jequalis Kingsley. 



Betceus eguimanus (nom. prseoc), Lockington, I. c. Mar. 20, 1876. 

 Appears to be near the Alpheus harfordi described above. If it prove 

 distinct, it will stand as cequalis, as the name equimanus has been used 

 by Dana. 



Peaeody Academy of Science, 



Salem, Mass., Novemler 5, 1877. 



