i6 Memoirs of the Indian Museum. [Vol. IV, 



Family SQUILLIDAE. 



To this family all recent Stomatopoda are referred , along with a few fossil species 

 from the London clay and from the Cretaceous rocks of Lebanon, and Necroscilla 

 wilsoni, Woodward, a form of doubtful affinities described from a fragment obtained 

 in the middle coal-measures. 



The existing forms may be classed under six genera which are distinguished 

 as follows : — 



I. Articulation between merus and ischium of raptorial claw terminal 

 (normal) ; merus grooved inferiorly for reception of propodus throughout 

 its length ; propodus finely pectinate or with a series of fixed spiues along 

 outer edge of dorsal surface ; dactylus rarely inflated at base. 



A. Carapace with well-marked carinae ; cervical groove defined across 

 dorsum of carapace ; first five abdominal somites with longitudinal 



carinae (raptorial dactylus not inflated at base) . . . . . . S quitta, p. 16. 



B. Carapace without carinae ; l cervical groove not extending across 

 dorsum of carapace ; l first five abdominal somites without longitu- 

 dinal carinae. 1 



i. Abdomen usually compressed ; raptorial dactylus not inflated at 

 base with two, rarely three, teeth on inner margin,' 2 or unarmed ; 

 telson with sharp median carina and (in adults) with other 

 carinae on either side . . . . . . . . Pseudosquilla, p. 94. 



2. Abdomen depressed ; raptorial dactylus not inflated at base 

 with at least four teeth on inner margin 2 ; telson without median 



carina, often smooth or with a transverse circlet of spines . . Lysiosquilla, p. 109. 



3. Abdomen depressed ; raptorial dactylus with three teeth on 

 inner margin 2 ; telson closely studded with fine spinules or large 



tubercles, with or without a pair of submedian carinae . . . . Coronida, p. 129. 



II. Ischio-meral articulation of raptorial claw situated at a point anterior 

 to proximal end of merus, which consequently extends backwards con- 

 siderably beyond the joint; ventral surface of merus grooved and 

 hollowed for reception of propodus for not more than three-quarters its 

 length ; dactylus inflated at base. 



A. Dactylus of raptorial claw with teeth on its inner margin . . . . Odontodactylus,-p. 133. 



B. Dactylus of raptorial claw without teeth on its inner margin . . Gonodactylus, p. 145. 



Genus Squilla, J. C. Fabricius. 



1793. Squilla, J. C. Fabricius, Ent. Syst., ii, p. 511 (partim). 



1825. Squilla, Latreiïle, Encycl. Method., X, p. 467 {partim). 



1837. Squilla, Squilles fine-tailles, 2nd sect., H. Milne-Edwards, Hist. Nat. Crust., II, pp. 518, 520. 



1841. Clorida, Eydoux and Souleyet, Voy. delà 'Bonite,' Zool., i, Crust., p. 264. 



1 Except in the Mediterranean Pseudosquilla ferussaci. I have seen no examples of this very rare 

 and interesting Mediterranean species. It appears to combine the telson of a Pseudosquilla with many 

 of the characteristic features of Squilla, but is perhaps rather more nearly allied to the former genus than 

 to the latter. For an account and figures of the species, see Giesbrecht, 1910, p. 34, pi. iv, figs. 37-48. 

 % Excluding the terminal tooth. 



