472 Mr. W.N. Lockington on American Alphei. . 
from the locality (Santa Barbara, California) where Kingsley’s 
sper were collected. The details of the hands also 
iffer. 
From A. bellimanus this species may be distinguished by 
the presence of a slender spine on the distal extremity of the 
meral joints of the first pair, by the want of the antennal 
basal spine, the less complex sulcation of the larger hand, 
the absence of an external spine on the smaller hand, and 
the equal length of the first two carpal joints of the second 
air. 
' As Kingsley had only an imperfect specimen, and does not 
describe the rostrum and front, I cannot be sure that this 
species belongs to this section. 
Alpheus minor, Say. 
Alpheus minus, Say, Journ. Acad. Nat. Sci. 1818, i. p. 245; Edwards, 
Hist. Nat. des Crust. ii. p. 356; De Kay, New York Fauna, Crust. 
p- 26; Gibbes, Proc. Am. Assoc. Adv. Sci. 1851, p. 196; Kingsley, 
Bull. U.S. Geol. & Geogr. Surv. vol. iv. no. 1, p. 190. 
Alpheus formosus ?, Gibbes, loc. cit. 
Kingsley believes A. formosus identical with A. minor: 
the range.of variation, both in size and in rostral characters, 
appears to be great; and as it occurs along a great length of 
coast, it is not unlikely that distinct geographical varieties 
may be made out. 
Alpheus cequidactylus, Lock. 
Alpheus equidactylus, Lock. Proc. Cal. Acad. Sci. vol. vii. pt. 1, p. 35. 
Front trirostrate, without sulcus between rostrum and ocular 
spines; the latter short, not greatly in advance of the eyes, 
the former extending slightly beyond first joint of antennular 
peduncle. 
Basal spine of antennule stout, extending to end of second 
joint of antennular peduncle ; joints of the latter subequal ; 
flagella ? 
Basal joint of antennee with a small spine below; spine of 
antennal scale overpassing antennular spine by about one 
fourth of its length, but not extending to tip of antennular 
peduncle. Antennal peduncle intermediate in length between 
the antennular spine and that of antennal scale; flagella ? 
External maxillipeds about equal to peduncle of antenne. 
Smaller (?) hand elongate-ovate, smooth, without spines, but 
with a transverse sulcus behind articulation of dactylus; a 
deep narrow longitudinal sulcus continuing backwards from 
the transverse sulcus for two thirds the length of the palmar 
portion: pollex with two teeth near base; tip recurved, 


