1913-] S. Kemp : Crustacea Stomatopoda of the Indo-Pacific Region. 109 



Genus Lysiosquilla, Dana. 



1825. Coronis, Latreille, Encycl. Method., X, p. 474 (nom. firaeocc). 



1837. Squilla (Squilles fine-tailles, ist sect.), H. Milne-Edwards, Hist, Nat. Crust., II, p. 518. 



1837. Coronis, H. Milne-Edwards, ibid. p. 530. 



1849. Squilla (sect. Maculatae), De Haan, in Siebold' s Fauna Japonica, Crust., p. 220. 



1852. Lysiosquilla, Dana, U.S. Explor. Exped., Crust., p. 616. 



1880. Lysiosquilla, Miers, Ann. Mag. Nat. Hist. (5), V, p. 5. 



1894. Lysiosquilla, Bigelow, Proc. U.S. Nat. Mus., XVII, p. 502. 



1910. Lysiosquilla, Giesbrecht, Faun. Flor. G. v. Neapel, XXXIII, p. 44. 

 Carapace little if at all narrowed anteriorly ; cervical groove wholly absent or scarcely 

 traceable, never continuous from side to side ; longitudinal carinae absent ; antero- 

 lateral angles never spinous. Cornea of eyes small or considerably expanded. Mandi- 

 bular palp composed of three segments. Merus of raptorial claw articulating terminally 

 with ischium ; ventral surface of merus longitudinally hollowed throughout its length ; 

 upper margin of propodus finely pectinate ; dactylus not inflated at base, armed with 

 teeth on inner margin. Penultimate segment of third and fourth thoracic limbs close to 

 insertion of ultimate segment flattened and transversely ribbed. Shorter, ramus of last 

 three thoracic limbs composed of two segments, basal segment short, ultimate segment 

 longer, linear or oval. Free thoracic and abdominal somites flat, depressed and with- 

 out longitudinal carinae. Telson broader than long, in Indo-pacific forms of two 

 distinct types. First type without dorsal spines and with posterior margin unarmed 

 or cut into a few large blunt teeth. Second type with a curved transverse row of spines 

 or prominences near distal end, with sharp primary teeth, a number of submedian 

 spinules and a few intermediate denticles. One slender movable spine situated beneath 

 submedian teeth or wholly replacing them. Ventral process of uropods consisting of 

 two large spines, inner longer than outer ; inner spine rarely suppressed. 



Some of the species are transversely barred with deep blue-black or black pigment. 

 Secondary sexual distinctions are usually absent ; but the raptorial claw of very 

 large female L. maculata and L. glabriuscula is modified. 



In some, perhaps in all, species of the genus soft elongated papillae are found 

 on the antennal protopodite. These are well-developed in L. maculata and are three 

 in number, one situated antero-dorsally and curved backwards and inwards towards 

 the base of the rostrum and two on the ventral surface at the base of the endopod, 

 a long one directed forwards and a much shorter one pointing backwards. In 

 L. acanthocarpus , L. multifasciata, L. spinosa and L. insignis only one of these pro- 

 cesses is found, placed on the ventral surface and pointing outwards or backwards. 



One Indo-pacific form, L. maculata, is found in the Atlantic, but appears to be 

 very scarce in those waters ; another is so closely allied to L. biminiensis from the 

 Bahamas that it has only been accorded subspecific rank. With these exceptions no 

 Indo-pacific species of the genus is known to occur in the Mediterranean and Atlantic 

 or on the Pacific coasts of America. 



The twelve species found in the Indo-pacific fall readily into two groups distinguished 

 at a glance by the presence or absence of a transverse dorsal series of spines near the 

 distal end of the telson. The first group, comprising those species without these spines, 



