18 NEW-YORK FAUNA — CRUSTACEA. 
GENUS HIPPA. Fabricius. 
Body oblong-oval, convex, truncated in front, with a small triangular rostrum. Tail short, 
with a lamellar appendix on each side of its base. Hands without pincers, compressed, 
oval. External antenne usually rolled up, but, when extended, long and filiform, with a 
double series of long hairs. Tarsus of the second and third pairs of feet lunated; of the 
fourth, triangular. 
Hipra TALPoIDA. 
PLATE VI. FIG. 17. 
Hippa talpoida. Savy, Jour. Acad. Nat. Sciences, Vol. 1, p. 160. 
A, emerita? Mitne-Epwarps, Hist. Nat. des Crust, Vol. 2, p. 209. GovuLp, loc, cit. p. 328. 
Description. Shield with interrupted rugous lines in front, smooth behind. Tail more than 
half the length of the shield, sublanceolate, with reflected lateral margins; the external 
spine of the large basal articulation of the external antenne extends somewhat beyond the 
globular part of the fourth articulation. Body convex-oval when the tail is inflected upon it, 
concave above, on the sides, in front, and very convex behind. Immediately behind the ros- 
trum is a deep transversal furrow 0°25 in length, its end turned slightly backwards ; a similar 
furrow, but curved with its concavity forwards, and with a smooth elevated margin, is placed 
somewhat in advance of the central portion of the thorax. Rostrum small, triangular, with 
a deep emargination on each side, terminated by a small tooth exceeding somewhat the ros- 
trum. External antenne longer than the shield, but frequently folded up, and almost entirely 
concealed between the mouth and the external jaw-feet. Eyes very small, on filiform pedi- 
cels. Internal antenne short. Tail pointed with a double series of hairs. ‘Terminal articu- 
lation of the anterior feet oval. 
Color, light reddish brown ; the shield purple. 
Total length, excluding the antenne, 2:0, ‘Transverse diameter, 06. Tail, 0°6. 
The original describer of this species, Mr. Say, stated that it was very closely allied to the 
H. emerita of authors ; but was of opinion that the great length of the antennz, and the shape 
of the tail, indicated a distinct species. Milne-Edwards has, however, in the work cited above, 
referred it with doubt to the H. emerita, and in this he is followed by our distinguished crus- 
taceologist Dr. Gould. In his description of the H. emerita from Brazil, M. Edwards says, 
““ L’épine externe du grand article basilaire des antennes externes, dépassent de beaucoup 
“la portion globuleuse formée par le quatriéme article pédonculaire de ces organes.” An in- 
spection of the magnified figure on the plate, will show that the foregoing phrase does not 
apply to this species. 
This species is known under the popular name of Sand-bug, and burrows in the sand be- 
tween high and low-water mark. ‘The ease and rapidity with which they burrow, has given 
rise to its trivial name. They are occasionally used as bait. It occurs along the coast of the 
United States, from near Cape Cod southwardly. 
