STOMA POD A. 213 



Iiave a scale at their base, and the stem of the intermediaries is com- 

 l)osed of three filaments. The body is narrow and elongated ; the 

 ocular pedicles are ahvays short. 



This family is conii^osed of but one genus, that of 

 Squilla ; Fab., 



Wniich we will divide in the following manner : — 



In some the erustaceoiis shield is preceded by a small and more or 

 less triingular plate, situated above tlie segment, in which the eyes 

 and mediate antennae are inserted, only covers the anterior portion of 

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

 piece which serves as a peduncle to the mediate antennae, 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 the 

 last segment being rounded, dentated or spinous; the lateral a]jpen- 

 dages 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 si)inous on the other, and the ensuing 

 joint, or the claw, falciform and usually dentated. 



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

 Encyclop. Method., Atl. d'Hist. Nat., CCCXXIV ; Desmar., 

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

 the large forceps is furnished with three moveable 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 

 excepted, 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 tvro very strong teeth. It is common in the 

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

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

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

 tion of the abdominal segments, tlie last ones excepted, are 

 smooth*. In the 



GONODACTYL'JS, Lat.. 



The groove of the licnultimate segment of the large claws is 

 widened at its extremity, j^rcsenting neither dentations nor spines. 

 The finger is dilated, or resembles a knot near its base, terminating 



* For the other species, see the article Squille, and pi, of the Encyc. Method. ; 

 Desmar., Consid, In pi. XLII, he has given a detailed figure of the Squilie 

 qncuc-nalc. 



