C A R I D E A. 541 



g', extremity of same, inner view, more enlarged ; h, hand of second 

 pair ; i, extremity of leg of fourth pair. 



Oahu, Hawaiian Islands. 



Length of body, fourteen lines. The beak either side of the carina 

 above is canaliculate or longitudinally concave, owing to the fact that 

 the margin is a little raised. A strong spine on outer side of first 

 basal joint of inner antennae. The last joint of the outer maxillipeds 

 is a little longer than the preceding, and terminates in a stout point 

 or spine ; it bears several longish black spines on its surface. The 

 palpus is a little longer than the second joint. The four anterior legs 

 are very nearly naked, excepting the black setae at the tips of the 

 fingers, which are as long as the fingers. The tarsi are short and 

 stout, with four or five short spines below. The surface of the fourth 

 and fifth joints of the six posterior legs is set with minute spinules in 

 a few lines, giving it a scabrous character. The transverse sulci of 

 the carapax mentioned by Dr. Randall, we do not observe in our 

 specimen, and his figure of the leg of the third pair differs from this 

 leg as observed by the author. 



A. li'sukata, RANDALL, Jour. Acad. Nat. Sci. Philad., viii. 140. 



FAMILY PAL^EMONID^. 



SUBFAMILY ALPHEIK3E. 



GENUS ALPHEUS, Fabricius. 



THE tooth or spine externally at the base of the inner antennae, and 

 the jointing of the carpus of the second pair of legs, afford convenient 

 characteristics for distinguishing the species of Alpheus in addition to 

 those commonly used. The first joint of the carpus may be very 

 much shorter or much longer than the second, or equal to it, and 



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