KINGSLEY ON THE GENUS ALPHEUS. 195 



short distance upon the outer surface. The dactylus is also somewhat 

 obliquely articulated. 

 Three specimens from Florida give the following measurements: — 



Length of body. Carapax. Larger hand. 



30.3™"^ 11.2""" 17.6™™ 



29.6 10.8 15.3 



32.5 13.8 15.0 



Specimens from Lake Harney, Florida (which is, I am informed by 

 Prof. J. W. P. Jenks, a body of fresh water), are greatly larger than the 

 average : — 



Length of hody. Carapax. Larger hand. 

 437111111 IS.O"^"! 20.5"'™ 



42.0 15.G 25.0 



I have examined specimens from Fort Macon, N, C. (Dr. H. C. Yar- 

 row) ; Smyrna and Key West, Fla. {A. S. Packard, jr.) ; Bahamas, Ber- 

 mudas [G. B. Goode); Aspinwall {J. A. McNiel); Abrolhos, Brazil (C F. 

 Eartt). Specimens brought from Panama by F. H. Bradley and from 

 Kealigo, west coast of Nicaragua, by J. A. McWiel, appear to be the 

 same as the east-coast form. In the Proceedings of the California 

 Academy of Sciences for February 7, 1876, Mr. Lockington describes 

 Alpheus equidactylus, the characters of which agree, so far as they go, 

 perfectly with this species ; but, owing to the imperfections of his de- 

 scription, I am unable to decide whether they are the same. 



Alpheus afpinis Kingsley. 



Carapax rather broad, smooth 5 rostrum acute, separated from the 

 ocular arches by a sulcus; ocular arches produced forward; peduncles 

 of antennulae hirsute; basal spine extending to second joint; joints of 

 peduncle as in heterocJielis. Basal joint of antennae with spine beneath; 

 basal scale narrower than in heterocJielis, extending as far forward as 

 peduncle of antennulae ; flagellum as long as body. External m axillipeds 

 hirsute, extending to extremity of basal scale. Meros of first pair tri- 

 angular; spines on the inner inferior margin. Larger cheliped quite 

 compressed; a constriction on the upper margin, the posterior edge of 

 which extends forward as a spine ; a sulcus runs back from this con- 

 striction on both the inner and outer surface to behind the middle of 

 the palm; lower margin compressed opposite the constriction in the 

 upper. Dactylus as in heterochelis, but obtuse. Smaller hand as in 

 heterocJielis, but more slender. Carpus of second pair five-jointed ; first 

 and second equal, and each as long as the three remaining ; third and 

 fourth equal, and each slightly shorter than fifth. Telson slightly 

 tapering ; extremity rounded. Panama {F. H. Bradley). Seven speci- 

 mens. 



Alpheus pakvimanus Kingsley. 



Slender, compressed; rostrum short, acute; basal spine of antennulse 

 not reaching second joint; basal joints nearly equal, the third being 



