AMPHIPODA. 221 



Tlu species best known and the type of this subgenus is the 

 Cancer pulex, L. ; Squilla pulex, De Geer, Insect., VII, xxxiii, 

 1,2. It inhabits brooks, &c. The other species are marine *. 



The antennae of the following, as in all the other Amphipoda, are 



Simple or without appendages. 



MELITA, Leach. 



The second pair of % feet, in the male, terminated by a largo com- 

 pressed forceps, the toe folding under its internal surface ; the an- 



t im, ni-arly ,|M il in length ; a small foliaceous appendage on each 



vile of tin- posterior extivniily uf the body f. 



M KK A. Leach. 



The second fret in the males terminated as in the Melitae, but tin- 

 toe folds under the inferior edge of the forceps and is not concealed. 



The superior antennae are longer than the inferior, and the foliace- 

 otls appendages of the posterior extremity of the body are want- 



'.* { 



AMPHITHOE, Leach. 



The four anterior feet nearly similar in both sexes; the penultimate 

 article or hand proper, ovoid . 



PHERUSA, Leach. 



The Phorusae only differ from the proceeding subgenus in the hand 

 of the forceps, which is filiform ||. 



There, the peduncle of the antennae is only composed of two joints, 

 the third being so small as to be confounded" with those of the stem, 

 or forming that of the base ; the superior are longer than the inferior. 

 All the feet are simple, or without forceps. Such is 



DEXAMINE, 



In those, the moveable toe of the two forceps is bi-articulated. 

 The antennae are of equal length. 



LEUCOTHOE, Leach. 



The antennae short, their peduncle formed of two joints ; the four 

 anterior feet terminated in a stout forceps ; toes of the two first bi-ar- 



* See Desmar., Consid., p. 265, 267- 



f Cancer palmatus, Montaf?., Trang. Lin. Soc., VII, p. 69; Encyclop. Method., 

 Atl..rili<t. Nat.. CCCXXXVI, :n ; Desmar., Consid., XL\ . :. 



; ' n.iurus grorimanus, Montag., Trans. Lin., Soc., IX, iv. 5 ; Desmar. 



L, p. 264. 



$ *' ..-.ifi'i, Montag., Trans. Lin. Soc., IX, p. 99; Encyclop. Method., 



Ail. d'llixt. Nat., CC( \\\\ I. :u ; Desmar., Con-id.. XLV, 9; Onisctu canceltos, 

 I'nll.. Spic. Zool. Fascic., IX, iii, 18; Gammarus cunccllus. Fab. 



|| Phtnusa fusicola, Lench ; Trans. Lin. >>,., M, p. 360; Desmar., Consid., 

 p. 268. 



V Cancer gammon* spinosus, Montag., Trans. Lin. Soc., XI, p. 3 ; Desmar., 

 Consid., XLV, 6. 



