82 CRUSTACEA. 



tatory. The lateral antennae have a scale at their base^ and 

 the stem of the intermediaries is composed of three filaments. 

 The body is narrow and elongated ; the ocular pedicles are 

 always short. 



This family is composed of but one genus, that of 



Squilla, Fab., 



Which we will divide in the ioUowing manner: 



In some the crustaceous shield is preceded by a small and more 

 or less triangular plate, situated above the segment in which the 

 eyes and mediate antennae are inserted, only covers the anterior por- 

 tion of the thorax, and does not curve downwards on the sides. The 

 piece which serves as a peduncle to the mediate antennss, as well as 

 the ocular pedicles and the external sides of the end of the abdomen, 

 are exposed. 



Here the body is almost semi-cylindrical, the posterior edge of J 

 the last segment being rounded, dentated or spinous; the lateral ap- i 

 pendages of the last six feet are styliform. 



SquiLLA, Lat. 



The true Squillse, along the whole inner side of the penultimate 

 segment of the two large claws, have an extremely narrow groove, 

 dentated on one of its edges and spinous on the other, and the ensu- 

 ing joint or the claw, falciform and usually dentated. 



Squilla mantis; Cancer mantis, L..; Herbst., XXXIII, 1; En- 

 cyclop. Method., Atl. d'Hist. Nat., CCCXXIV; Desmar., Con- 

 sid., XLI, 2, is about seven inches in length. The base of the 

 large forceps is furnished with three movable spines, and its 

 claws have six elongated and sharp-edged teeth, the last one 

 being the largest. The segments of the body, the last one ex- 

 cepted, are marked by six longitudinal ridges, mostly termi- 

 nating in a sharp point; the middle of the last is strongly cari- 

 nated, punctured and terminated posteriorly by a double range 

 of indentations, and four very stout points, the mediate teeth of 

 which are most closely approximated; each lateral margin has 

 two reflected or thicker divisions, the last one terminating in a 

 point. The peduncle of the lateral fins is prolonged beneath 

 and terminated by two very strong teeth. It is common in the 

 Mediterranean. The Squille de Desmarest, Rlsso, Crust. II, 8, 

 which also inhabits the same sea, is but two inches and a half in 

 length. Its claws have five teeth; the shell and the middle por- 



