CRUSTACEA. 
141 
Brought by Mr. Nuttall from the Sandwich 
Islands. 
Genus Alpheus, (Fabr.) 
A. brevirostris ? (Edw.) Mus. Acad. 
Dr. Burroughs has brought from Manilla a 
species of Alpheus, agreeing with M. Edwards’s 
description of A. brevirostris, with this exception, 
that it has a distinct tooth on the outer side of the 
basilar article of the external antennae ; there is also 
a somewhat elevated ridge on the outer side of the 
arm. I have named it, provisionally, A. dispar. 
Another species of Alpheus has been brought 
from the Sandwich Islands by Mr. Nuttall, in 
which the orbitar arches are considerably produced, 
and armed each with a short slender spine ; the 
external side of the basal article of the external an- 
tennae is continued into a sharp tooth ; the rostrum 
is short, entire, and very pointed ; the second arti- 
cle of the internal antennae is about one-half longer 
than the first; the carapax is entirely smooth; 
hands smooth, the right one largest, the fingers very 
short, the moveable one very obtusely rounded. 
Length about 1 h inches. 
I have named this species A. losvis. Mus. Acad. 
Fam. Palemonidce. 
Genus Hippolyte, (Leach.) 
H. marmoratus, (Palemon marmoratus, Oliv.) 
Mus. Acad. 
Several specimens, brought from the Sandwich 
Islands by Mr. Nuttall. 
