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



*** Dactyli of the raptorial li?nbs armed with Jive spines. 



Squilla scorpio. (PI. II. fig. 7.) 



Squilla scorpio, Latr. Encycl. Meth. x. p. 472 (1825) ; M.-Edw. Hist. 

 Nat. Oust. ii. p. 522 (1*837) ; White, List Crust. Brit. Mus. p. 84 

 (1847). 



Carapace with three longitudinal carinas, which are inter- 

 rupted by the distinctly marked cervical suture ; the antero- 

 lateral angles are armed with a short spine ; and the postero- 

 lateral lobes of the carapace have a slightly raised outer 

 margin, and a short carina on the upper surface. The rostrum 

 is suboblong, and armed with a short median ridge. The 

 anterior of the exposed thoracic segments is produced laterally 

 into a somewhat curved and falcate acute lobe, Avhich is ex- 

 cavated above at base ; the two following are but little laterally 

 produced and rounded ; the first to sixth postabdominal seg- 

 ments are armed with eight longitudinal carina, but are 

 without any median carina or tubercle ; on the fifth segment 

 all except the submedian, and on the sixth segment all the 

 carinas terminate in spinules. The terminal segment is smooth 

 on its upper surface, and is armed with a median carina ; four 

 small rounded lobes between the median, and four to five 

 between the median and first lateral spines. The distal pro- 

 longation of the basal part of the uropoda terminates in two 

 unequal spines. Length about 3 inches. 



Hob. Asiatic and Australian seas. 



Specimens are in the Museum collection from Port Essing- 

 ton (Earl of Derby and J. Gould, Esq., F.R.S.), North 

 Australia (Dr. J. R. Elsey), and Shanghai (R. Swinhoe,Esq.). 

 It is recorded by Latreille from Pondicherry. 



In adult males the carinas of the penultimate postabdominal 

 segment, and the median carina and marginal teeth of the 

 terminal segment, are considerably thickened. This peculi- 

 arity it not observable in a female (apparently adult) and 

 two younger individuals in the Museum collection. 



I have little hesitation in identifying the Museum specimens 

 with Latreille's description, as he particularly mentions the 

 form of the tooth-like lateral prolongation of the first exposed 

 thoracic segment, while Milne-Edwards refers to the dila- 

 tation of the median ridge of the terminal postabdominal 

 segment. 



Squilla Dufresnii. (PI. II. figs. 8, 9.) 



Squilla Dufresnii, Leach (MS.), White, List Crust. Brit. Mus. p. 83 

 (1847), sine descr. 



The two examples of this species in the Museum collection, 



