198 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



also equal; fifth joint nearly as long as the first. Meros joints of pos- 

 terior pairs without spines; propodal joints spinulose beneath ; dactyli 

 slender. Santa Barbara, Cal. ( W. G. W. Harford). 



From the description of Mr. Lockington, I get the following additional 

 characters, not afforded by my imperfect specimen : — Front three- spined ; 

 the rostrum slender, longer than, and separated from, the ocular spines 

 by a deep sulcus. Flagella of antennulse about half as long and of 

 antennae three-fourths as long as the body, 



Alpheus longidactylus Kingsley. 



Beiceus longidactr/lus, Lockington, Z. c. Feb. 7, 1876. 

 Compressed; carapax smooth; front rounded; rostrum and ocular 

 spines wanting; antennular spines slender, acute. First and second 

 an tennular joints subequal, third shorter; inner flagellum three-fourths 

 the length of carapax, outer f Antennal scales shorter than peduncles 

 of either pair of antennae. External maxillipeds extending nearly to 

 extremity of antennal peduncle. Hands of the first pair equal, slender, 

 inversed; dactylus slightly longer than palm, with a few teeth on the 

 dactylus at the base. Pincer gaping, a single tooth on the thumb near 

 •the palm ; fingers both pointed. Carpus of second pair five-jointed ; first 

 joint as long as the three following; second, third, and fourth equal j 

 fifth slightly longer. Extremity of telson rounded. 



Length of body. Of carapas. Of hand. 



35.0""" 12.0™™ . . . 



... 8.0 7.0™™ 



San Diego, Cal. {Henry Hetnphill); two dry, imperfect specimens. 



Alpheus harfordi Kingsley. 



Carapax smooth ; rostrum wanting, the front being emarginate between 

 the eyes. Basal scale of antennulse spiniform, very long and slender^ 

 extending forward as far as the middle of second joint and slightly in- 

 curved. Second joint of peduncle three times as long as last joint. 

 Outer branch of flagellum about one-half and inner about two-thirds 

 the length of carapax. Antennse without a spine on the basal joint;, 

 antennal scale with the spine long and slender, the laminate portion 

 being quite small. Flagellum about two-thirds the length of body. 

 Meros of first pair trigonal, with a small spine at upper distal angle 

 Larger chela compressed-ovate, smooth, without corrugations or con- 

 strictions; poUex with a notch furnished with two or three small teeth 

 near the articulation of the dactylus; dactylus slender, extending be- 

 yond the opposite finger, a notch similar and opposite to that on the 

 thumb ; the dactylus is articulated to the inferior margin of the pro- 

 podus. Smaller hand not greatly differing from the larger, but more 

 slender, and the fingers without any notch. Feet of second pair slenderj 

 ischium slightly shorter than meros; carpus five-jointed, the first as 

 long as the three succeeding ones ; second, third, and fourth equal; the 



