Mr. W..N. Lockington on American Alphei. 479 
Basal scale of antennule a slender spine, reaching beyond 
the middle of the second joint of the peduncle. Second joint 
of the peduncle nearly twice as long as the last joint ; pedun- 
cle slightly shorter than that of antenne. Outer branch of 
flagellum about two thirds the length of the inner. 
Antennal scale with long slender spine, the laminate por- 
tion reaching about to end of peduncle. Antenne without 
sin on basal joint; flagellum more than half the length of 
ody. 
“‘Meros of first pair trigonal, with small spine at upper 
distal angle.” 
Hands nearly equal, entirely smooth, compressed, ovate ; 
dactylus with a sharp recurved point and a straight edge, 
margined with sete; this is opposed to a similar straight 
edge, margined with sete, on the pollex, which also ends in a 
sharp incurved point. The dactylus of both hands has a 
basal tooth. The fingers gape slightly at the proximal end. 
Feet of second pair slenderer than third and fourth, but not 
greatly longer; ‘ischium slightly shorter than meros; carpus 
five-jointed: first joint as long as the three succeeding ones ; 
second, third, and fourth equal; fifth slightly longer. Chela 
about as long as the two preceding joints. 
“ Dactyli of posterior pairs spinulose at tip. 
“'Telson slender, tapering ; extremity regularly rounded.” 
Length of larger specimen 1:05 inch. 
Two specimens examined, both females with ova; Catalina 
Island, Cal. (S. A. L. Brannan). 
This species lives under the mantle of Haliotis rufescens, 
Swains. 
Colour, when fresh, dark purple; in alcohol, a light flesh 
tint. 
I have here supplemented the short description given in the 
Proc. Cal. Acad. Sci., with others taken from Kingsley’s 
description of A. Harfordi, and verified by reexamination 
under the microscope, the previous examination having been 
made with hand-lens only. I cannot find the “ notch fur- 
nished with two or three small teeth near the articulation of 
the dactylus,” mentioned by Kinglsey as existing upon the 
pollex of the larger hand; perhaps his specimens were males. 
Kingsley gives the following dimensions :— 
Length. Carapax. Larger hand. Larger dactylus. 
millim. millim. millim. millim. 
24:0 8:0 8:0 4°7 
19-0 6:0 6:0 3°6 
My reexamination of the specimens has convinced me that 
