DECAPODA. 57 



long and filiform, and the third joint of the foot-jaws very large and 

 laminiform, emarginated 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 approaching, 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(l). 



Remipes, Lat. 



The two anterior feet elongated, the last joint conical, compressed, 

 and hairy; the four antennse closely approximated, very short, and 

 nearly 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 Hippse. 



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 Hippse, 



the first caudal segment presents two impressed and transverse lines. 



Two species are known; one from the Australian Seas(2), and 



the other from the Antilles, and the coast of Brazil. 



There (the Pagurii, Latr.), the teguments are somewhat crusta- 

 ceous, and the tail is most commonly soft, contorted, and in the form 

 of a sac. The two anterior feet terminate 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, presents 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 



(1) Hippa adaciyla,Fa.h.^ H. emeritus, 16..-, Cancer emeritus, "L.; Emerita, Gro- 

 nov., Zoop., xvii, 8, 9; Herbst., xxii, 3; Desmar., Consider., xxix, 2, in the seas 

 of both Indies. 



(2) Remipes testudinarius, Latr.; Desmar., Consid., xxix, 1; Cuv., Regne Ani- 

 mal, IV, xii, 2. 



Vol. III.— H 



