1913O S. Kemp: Crustacea Stomatopoda of the Indo-Pacific Region. 17 



S quill a, sect. Raphideae, De Haan, in Siebold's Fauna Japonica, Crust., p. 221. 



Squilla, Dana, U. S. Explor. Exped., Crust., p. 618. 



Squilla, Miers, Ann. Mag. Nat. Hist. (5), V, p. 16. 



Chloridella, Miers, ibid., p. T3. 



Leptosquilla, Miers, ibid., p. 12. 



Squilla, Brooks, Voy. H. M. S. ' Challenger,' XVI, Storaatop... p. 23. 



Pterygosqnilla, Hilgendorf, Sitz.-ber. Ges. naturf. Freunde, Jahrg. 1890, pp. 172, 187. 



Squilla, Bigelow, Proc. U. S. Nat. Mus., XVII, p. 509. 



Pterygosqnilla, Bigelow, ibid., p. 492. 



Leptosquilla, Bigelow, ibid., p. 492. 



Squilla, Hansen, Isop., Cumae. u. Storaatop., Plankton-Exped., p. 69. 

 903. Chloridella, 1 Rathbun, Proc. U. S. Nat. Mus., XXVI, p. 54. 

 910, Squilla, Stebbing, Ann. S. African Mus., VI, p. 405. 



Carapace narrower in front than behind, with conspicuous gastric and cervical 

 grooves, the latter sharp and continuous across mid-dorsal area ; longitudinal carinae 

 usually distinct, never wholly absent ; anter o-lat er al angles usually spinous. Cornea of 

 eyes bilobed. Mandibular palp three-segmented or wholly absent. Merus of raptorial 

 claw articulating terminally with ischium ; ventral surface of merus longitudinally 

 hollowed throughout its length ; upper margin of propodus finely pectinate, or (more 

 rarely) with a series of long stiff spines ; dactylus not inflated at base, armed with teeth 

 on inner margin. Shorter ramus of last three thoracic appendages unjointed, or with 

 an imperfect suture separating short basal and long linear distal parts. Free thoracic 

 and abdominal somites depressed, with distinct longitudinal carinae. Telson of good 

 length, with a median carina, and smooth, pitted, tuberculate or carinate on either side. 

 Distal margin with three pairs of large teeth, submedians occasionally with movable 

 tips • one or more submedian denticles, several (always more than four) intermediate 

 and one lateral. Ventral process of uropods terminating in two sharp spines, inner 

 longer than outer and nearly always bearing a small lobe on its external margin. 



Well-marked secondary sexual distinctions occur in some species. The modifica- 

 tions, which are found only in the adult male, affect the structure of the raptorial 

 claw or the development of the carinae of the abdominal somite and telson. 



Miers recognized a distinct genus under the name Chloridella, comprising those 

 species which possess very small eyes ; but Brooks has shown that these forms are 

 linked to the more typical representatives of the genus by such species as 5. lata and 

 S. fasciata. Hansen regards Hilgendorf s Pterygosquilla as a synonym of Squilla and 

 identifies P. laticauda, the only known species of the former genus, with the earlier 

 Squilla gracilipes of Miers. Leptosquilla appears to be founded only on a late post- 

 larval stage, and, although it cannot be identified with any known adult form, there 

 is little doubt that it may safely be referred to this genus. 



Squilla, as has already been mentioned, is the oldest established genus of Stomato- 

 poda at present living and probably contains the most primitive species of the order ; 



1 Miss Rathbun considers that the name Squilla is preoccupied, but this view is not accepted by 

 Stebbing (1910). 



