478 Mr. W. N. Lockington on American Alphei. 
Alpheus fasciatus, nov. sp. 
Small; carapax smooth; no ocular spines; eye-shields 
scarcely produced forwards; rostrum about equal to diameter 
of eye; surface between rostrum and eyes slightly depressed, 
but with no distinct sulcus. 
Basal spine of antennule longer than basal joint of pedun- 
cle ; joints of peduncle nearly equal in length; inner branch 
of flagellum twice as long as outer, and rather longer than 
carapax. 
A small spine on basal joint of antenne below ; spine of 
basal scale about equal to peduncle; flagella wanting or 
broken in all the specimens under examination. 
External maxillipeds reaching to end of basal joint of 
antenne. 
Meros of first pair without spine; larger hand smooth, 
nearly cylindrical, tapering towards the dactylus, which is 
smooth, semicircular in profile, a fourth the length of the palm, 
and works vertically. Smaller hand very small, smooth, 
cylindrical, slender ; dactylus equal to palm; pollex as long 
as dactylus ; long hairs on inner side of fingers. 
Carpus of second pair five-jointed ; second joint two thirds 
the length of first, but equal to third and fourth together ; fifth 
a little shorter than second. Posterior pairs with cylindrical 
joints ; propodal joints spinulose beneath. 
Telson elongate, tapering, rounded at end. 
Colour after a short time in alcohol :—carapax and abdomen 
alternately banded with bright red and white; larger hand 
red, with marblings of white in some cases. 
Length of a large female 18 millims. 
Several specimens from Port Escondido, Gulf of Cal. 
(fisher). 
Alpheus cylindricus, Kingsley. 
Alpheus cylindricus, Kingsley, loc. cit. p. 196. 
From its short obtuse rostrum this form approaches Betceus. 
Loc. Pearl Island, Bay of Panama (£7. H. Bradley). 
Beteus equalis. 
Beteus equimanus, Lockington, Proc. Cal. Acad. Sci. vol. vii. p. 43. 
Alpheus equalis, Kingsley, N.-Amer. Species Alpheus, Bulletin U.S, 
Geol. and Geogr. Survey, vol. iv. no. i. 
Carapax smooth, compressed ; front curvately emarginate 
between the eyes. 
Outer maxillipeds as long as base of inner antenne ; sete 
of terminal joint long and closely set. 
