474 Mr. W. N. Lockington on American Alphei. 
mal extremity slightly broader than distal; a shallow sulcus, 
with a shorter one above, extending obliquely upwards from 
the carpal articulation on the inner side of the hand; dactylus 
short, smooth, compressed, semicircular in outline when viewed 
from the side, slightly overpassing the pollex, working verti- 
cally, and closing in groove in pollex, bright red at tip (in 
alcohol). Smaller hand with meros similar to larger; manus 
exceedingly elongated, smooth, cylindrical; dactylus almost 
as long as palmar portion of hand, slightly curved, working 
vertically, slightly overpassing the long and slender pollex. 
Both dactyli are somewhat setose on their opposed outer 
margins. 
Ischium and meros of second pair about equal; carpus 
with five joints, the first joint about equal to the next three 
united, second slightly longer than the third and fourth, 
which are equal ; fifth, palmar portion of hand, and dactylus 
about equal, and each about equal to the second joint. 
Posterior pairs without spines or spinules on any of the 
joints. 
Telson elongate, slightly tapering, with four spinules, in 
two pairs, on its upper surface, and a spine on each side of its 
convex truncate extremity, which is margined by long sete. 
Length 34 millims.; length of larger hand 10, of carapax 13 
to tip of rostrum. 
A single specimen, with the antenne and antennule 
damaged, from Port Escondido, Gulf of California (W. J. 
Fisher),is my only example of this species, which may easily 
be distinguished from its congeners by its long rostrum, smooth 
hands of equal length, and especially by the two pairs of 
spinules upon the telson. 
Alpheus leviusculus, nov. sp. 
Carapax stout, not compressed. Front trispinose, the ocu- 
lar spines triangular, almost equal in length to the triangular 
rostrum, which is not divided from the eye-shields by a 
sulcus. Basal spine of antennule stout, reaching to the 
middle of the second joint of the peduncle ; inferior branch of 
flagella two thirds longer than superior, which only slightly 
exceeds the peduncle in length. 
Basal joint of antenne with two spines, the upper one 
small, the lower almost half the length of the spine of the 
antennal scale, which does not reach to the end of the pe- 
duncle; flagellum short, reaching, when extended, slightly 
beyond the larger hand. 
First pair very unequal in size. Meros of smaller hand 
compressed, with a spine at the upper distal end ; hand about 
