192 
CRUSTACEA. 
laminiforni, emargiiiated at the end and covering the ensuing joints. 
The shell is nearly ovoid, convex, and truncated at both ends. 
The last joint of the second feet and of the two following pairs is 
triangular, but ap})roaching, in the latter at least, to the form of a 
crescent ; the two last of the fourth pair are turned up, and laid on 
the two preceding ones ; the first segment of the tail is marked with 
two impressed and transverse lines *. 
Remipes, Lat. 
The two anterior feet elongated, the last joint conical, compressed, 
and hairy; the four antennae closely ai)proximated, very short, and 
nearh'^ of an equal length, the intermediate ones terminated by two 
filaments ; ocular pedicles extremely short and cylindrical ; external 
foot-jaws in the form of small claws, thinned and arcuated at the end, 
and terminated by a stout hook. The shell is shaped like that of the 
Hippae. 
The last joint of the second and third feet forms a triangular blade, 
with an emargination in its external side; the same joint of the 
fourth is triangular, narrow, and elongated. As in the Hippae, the 
first caudal segment presents two impressed and transverse lines. 
Two species are known ; one from the Australian Sea t', and 
the other from the Antilles, and the coast of Brazil. 
There (the Pagjirii, Latr.), the teguments are somewhat crus- 
taceous, and the tail is most commonly soft, contorted, and in the 
form of a sac. The two anterior feet terminated in a didactyle hand, 
the four following ones in a point, and the four posterior, which are 
shorter, in a sort of forceps or little didactyle hand. The first joint 
of the peduncle of the lateral antennae presents a pointed or spiniform 
appendage or projection. 
These Crustacea, termed Carcinion by the Greeks, and Cancelli 
by the Latins, usually inhabit empty univalve shells. Their tail, that 
of the Birgi excepted, jjresents but three false feet, (in the females 
only), situated on one of the sides, each of which is divided into two 
filiform and hairy branches. The three last segments are suddenly 
narrowed. In some of them, such as the 
Birgus, Leach, 
The tail is tolerably solid, suborbicular, and is furnished beneath 
with two rows of laminiform appendages. The fourth feet are but a 
little smaller than the two preceding ones ; the two last are folded and 
concealed, their extremities being received into a depression at the 
bottom of the thorax ; the fingers at the extremity, as well as those 
of the penultimate pair, are hairy or spinous. I’he claws excepted, 
all the feet are visibly separated at their origin. The thorax has 
the figure of a reversed heart, and is pointed anteriorly. 
* Hippa aduriyla, Fal). ; H. emeritus. Id. -; Cancer emeritus, L. ; Emeritu, Gro- 
nov., Zoop., xvii, 8, 9; Ilerbst., xxii, 3 ; Desmar., ConsidL'., xxix, ‘2, in the seas 
of both Indies. 
f Remipes testudinarius, Latr. ; Desmar., Consid., xxix, 1 ; Cuv., Regne Animal, 
IV, xii, 2. 
