16 Mr. E. J. Miers on the Squillidse. 



Squilla. 



Squilla, Fabr. (part.), Ent. Syst. ii. p. 511 (1798); Latreille (part.), 

 Hist. Nat. Crust, vi. p. 271 (1803) ; Encycl. Meth. Hist. Nat. x. 

 p. 467 (1825); Lamarck (part.), Hist. Anim. sans Vert. v. p. 186 

 (1818) ; M.-Edwards (part.), Hist. Nat. Cr. ii. p. 517 (1837); I)e 

 Haan (part.), Faun. Japon. Cr. p. 220 (1849) ; Dana, Cr. U.S. Expl. 

 Exp. xiii. i. p. 615 (1852). 



Carapace usually marked with more or less distinct longi- 

 tudinal costse. Cervical suture posteriorly distinct. Rostral 

 plate rarely covering the base of the eye-peduncles. The 

 four or five posterior exposed thoracic segments and the post- 

 abdominal segments are compactly articulated, the latter 

 marked with six or eight longitudinal carinas ; terminal seg- 

 ment without or with two very minute mobile spines at its 

 distal end. Dactylus of the raptorial limbs not dilated at 

 base, and armed with long spines on its inner margin. The 

 appendages of the three posterior thoracic limbs are slender 

 and styliform. 



A. The exposed thoracic segments and the first to fifth postabdominal 

 segments with the dorsal surface marked with submedian carinas ; 

 terminal segment usually without mobile spines at its distal end. 



I. Penultimate Joint of the raptorial limbs without a series of 

 immobile marginal spines. 



* Dactyli of the raptorial limbs armed with three spines. 



Squilla Ferussacii. 



Squilla Ferussacii, Roux, Crust, de la Mediterranee (livr. 6), pi. xxviii. 

 (1830) ; M.-Edwards, Hist. Nat, Crust, ii. p. 525 (1837) ; Heller, 

 Cr. siidl. Europa, p. 308 (1863) ; Haller, Zool. Anzeiger, p. 207 

 (1879). 



Carapace widening posteriorly. Rostrum transverse, appa- 

 rently covering the ophthalmic segment, and divided by a 

 slight median emargination into two lobes. The median as 

 well as the lateral ridges of the postabdominal segments are 

 very distinctly defined : the terminal segment is armed with 

 eight strong marginal spines, but is without any intervening 

 denticles ; on its upper surface, on each side of the strong 

 median, a smaller lateral ridge is shown in Roux's figure. 

 The dactylus of the raptorial limbs is armed with only two 

 slender spines, besides the strong terminal spine. The distal 

 prolongation of the basal portion of the uropoda is repre- 

 sented as slender and elongated, with two lateral besides 

 the long terminal spine. The dominant colour of the body 



