« Mr. W.N. Lockington on American Alphei. 471 
Feet of first pair unequal. Larger hand constricted above 
the hind articulation of dactylus; a longitudinal groove con- 
tinued backwards from this constriction on outer side of hand 
for about half its length, and a second shorter sulcus running 
backwards close inside the upper margin of hand; a second 
transverse constriction posterior to the upper one, on the lower 
margin; from this a longitudinal sinuous sulcus is continued 
forward to the extremity of the pollex. A sharp spine 
on the distal end of the ridge separating the anterior portion 
of the upper outer longitudinal sulcus from the posterior por- 
tion of the lower one. A spine at articulation of dactylus. 
Dactylus broad, thin, and articulated, so as to close hori- 
zontally above the point of the pollex, which is very short 
and irregular in outline; a few long hairs on dactylus and 
thumb. Smaller hand compressed, constricted above and 
below ; a spine on outer surface at base of dactylus, and a 
second on upper margin at articulation of dactylus ; dactylus 
laminate, working vertically with a straight lower margin ; 
pollex slender; distal portion of hand and inner surface of 
dactylus hairy. 
Carpus of second pair five-jointed; first joint nearly equal 
to the next three; second and fifth subequal, each nearly as 
long as the third and fourth together. 
Meral joints of remaining pairs without a spine beneath ; 
propodi spinulose beneath. 
Telson tapering, convex at extremity. 
Length of larger specimen, from tip of rostrum to end of 
abdomen, 1°20 inch; length of larger hand half an inch, 
of smaller 0°38 inch. 
Loc. Two specimens from San Diego, found among kelp. 
The dried specimens, when comparatively fresh, have the 
hands beautifully coloured with spots and markings of black 
and white on an orange ground; and the carapax presents 
traces of similar coloration, 
Alpheus barbara, Lock. 
Alpheus clamator, Kingsley, Bull. U.S. Geol. & Geogr. Surv. vol. iv. 
no. 1, p. 197. 
This species, supposed by Kingsley to be identical with my 
A. clamator, is proved by the absence of a spine on the basal 
joint of the antenne, the different porportions of the carpal 
joints of the second pair, and the want of meral spines on the 
posterior pairs (characters belonging to parts not described 
in my notice of A. clamator) to be quite distinct from the 
latter ; and I have therefore assigned it the name of A. barbara, 
