TOE S. Kemp: Crustacea Stomatopoda of the Indo-Pacific Region. 109 
Genus Lysiosquilla, Dana. 
1825. Coronis, Latreille, Encycl. Méthod., X, p. 474 (nom. praeocc.). 
1837. Squilla (Squilles fine-tailles, 1st sect.), H. Milne-Kdwards, Hist, Nat. Crust., IT, 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. Lystosquilla, Miers, Ann. Mag. Nat. Hist. (5), V, p. 5. 
1894. Lysiosquilla, Bigelow, Proc. U.S. Nat. Mus., XVII, p. 502. 
tg10. Lysiosquilla, Giesbrecht, Faun. Flor. G. v. Neapel, XX XIII, p. 44. 
Carapace littleif 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, 
