OF NEW ZEALAND. 83 
eyes. External antenne with a very short spine at base, and another 
at the end of the last joint of the peduncle, the basal scale about 
equalling the length of the peduncle. Anterior legs with the hand 
elongate, twisted somewhat outwardly, with an oblique ridge above 
and. below, without grooves or notches, except a short transverse 
groove behind the base of the mobile finger, which is short, rounded 
above and compressed. Wrist of the second pair of legs with the 
first, (proximal), and second joints long, nearly equal, together exceed- 
ing in length the three last joints which are all short. Legs clothed 
with scattered hairs. Length about 2 in. 
New Zealand (Coll. Brit. Mus.). 
This species is allied to the Alpheus gracilipes, Stimpson, from 
Tahiti, but in that species the larger hand is straight, and the orbits 
acute in front. From A. socialis it is distinguished by the absence of 
spinules on the upper orbital margin, the shorter basal spine of the 
external antenne, &c. 
BETAEUS. 
Betaeus, Dana, U.S. Explor. Exped. xii, Crust. part i, p. 558, 
(1852). 
Resembles Alpheus. Front without a beak. Anterior hands more 
or less inverted, the mobile finger being the lower or outer. 
89. Betaeus equimanus. 
Betaeus wquimanus, Dana, U.S. Explor. Exped. xiii, Crust. part i, 
p. 560, pl. xxxv, fig. 11, (1852). 
Front with a deep emargination in place of beak. Basal scale of 
outer antenne a little shorter than base, outer spine very short ; basal 
spine of inner pair very long, second joint much shorter than first. 
Anterior legs equal, hand smooth, compressed, fingers very short. 
Legs of second pair longer than third, first jomt of wrist more than 
twice as long as second ; second, third, and fourth very short. Third 
joint of following legs wholly unarmed. Length 14 in. (D.). 
New Zealand; Bay of Islands (Dana). Along shores of Black 
Rocks among seaweed. 
I have not seen specimens of this species. 
G2 
