Mr. W. N. Lockington on American Alphei. 473 
pointed. Dactylus articulated vertically, smooth, compressed, 
with a tooth near base fitting between those of the pollex; tip 
recurved, pointed, crossing that of pollex. 
Carpal joints of posterior pairs produced into a blunt spine 
above distally; no spine on meral joints; propodi without 
spinules. 
Penultimate joint of abdomen with a spine, apparently 
movable, at lower angle, and a triangular projection on each 
side of base of telson, which is smooth, somewhat tapering, 
convex at extremity. 
Length of body 19 millims.,, of hand 7°5 millims. 
This description is taken from a single dried, broken, and 
defective specimen from Monterey, California (H. Hemphill). 
The flagella of both pairs of antenne are broken; one hand, 
probably the larger (?), is wanting, the other hand detached ; 
and the second pair is wanting. 
In my previous description (doc. cit.) I mention the larger 
hand ; but it is probable that the member thus called is the 
same as that I now think, from its small size, to be the 
smaller hand. 
Alpheus panamensis, Kingsley. 
Alpheus panamensis, Kingsley, loc. cit. p. 192. 
Loc. Acajutla, Central America, and Panama (/. H. Brad- 
ley). 
Alpheus tenuimanus, nov. sp. 
Carapax smooth, compressed, and arched in profile, much 
highest in centre. Front trispinose; rostrum much longer 
than ocular spines, reaching to middle of second joint of 
peduncle of antennule ; ocular spines slender, projecting from 
the centre of the convex front of the eye-shields. 
Basal spine of antennule reaching beyond the first joint of 
the antennular peduncle ; upper branch of flagellum about as 
long as carapax; lower 
A spine on basal joint of antenne below ; antennal scale 
equal to peduncle of antenne; flagellum not shorter than 
abdomen. 
External maxillipeds reaching beyond the antennal scale, 
with long hairs at tip. . 
Hands equal in length, not greatly differing in size, dis- 
similar. 
Meros of first pair compressed, somewhat triangular, rounded 
above, with a small spine above at distal end. Larger hand 
elongated, entirely smooth, rounded above and below; proxi- 
Ann. & Mag. N. Hist. Ser. 5. Vol. i. 32 

