igi3.] S. Kemp: Crustacea Stomatopoda of the Indo-Pacific Region. 125 



9, Lysiosquilla tigrina, Nobili. 

 Plate VIII, figs. 95-98. 

 1903. Lysiosquilla tigrina, Nobili, Boll. Mus. Torino, XVIII, no. 447, p. 28. 



The carapace is dorsally smooth and polished, and its greatest breadth is about 

 equal to its mid-dorsal length. The gastric grooves are well-defined and slightly con- 

 vergent posteriorly ; but of the cervicals scarcely a trace remains. The antero- and 

 postero-lateral angles are rounded. The rostrum is as long as broad ; the lateral margins 

 are only slightly convergent anteriorly and terminate in well-marked subacute angles. 

 The apex is sharply acute and reaches a little beyond the base of the eyestalk (fig. 95). 



The eyes are nearly one- third the mid-dorsal length of the carapace, and the cornea, 

 which is not pigmented at the extreme apex, is obscurely bilobed, its breadth being 

 about equal to the length of the stalk. The antennular peduncle is about half the 

 length of the carapace. The mandibular palp is composed of three segments. 



The outer inferior margin of the raptorial claw (fig. 96) is bluntly angled distally ; 

 the carpus is not carinate dorsally but terminates in a sharp spine overhanging the 

 carpo-propodal articulation. The propodus bears four mobile spines at the proximal 

 end of its pectinate edge. The dactylus is provided with eleven spines, including the 

 apical one, the penultimate being very slightly shorter than the next of the series. 

 The outer margin is convex and at its proximal end bears two small lobes, the ante- 

 rior of which is broad and rounded while the posterior is narrow and subacute. 



The free thoracic and abdominal somites are smooth ; the lateral margins of the 

 former are very broadly rounded, almost truncate, and the postero-lateral angles of 

 the latter are also rounded except in the case of the last somite, in which they project 

 posteriorly as a pair of long and sharp spines. On its inferior margin the sixth somite 

 (fig. 98) bears a pair of curved spines on either side at the antero-lateral angles and a 

 number of short spines rather irregularly disposed (nine in the only known specimen) 

 along the posterior margin. This series of spines is not known to occur in any other 

 species of Lysiosquilla. 



The telson (fig. 97) is smooth and rounded dorsally except for a faint transverse 

 depression on either side of the median line ; on its inferior surface there is a central 

 depression behind the anus. Dorsally it possesses a series of five spines arranged in a 

 curved transverse row near the posterior margin. There are four pairs of large mar- 

 ginal teeth, a pair of submedians, two pairs of intermediates and one pair of laterals. 

 Between the submedians there are six pairs of small denticles, the outermost of which 

 are mobile and longer than the rest, and outside these are three small fixed spines, 

 one in each interspace between the primary teeth. These small spines are all 

 inferior in position and are situated beneath the level of the larger ones (fig. 98). In 

 addition there is a single large spine immediately below the proximal primary tooth. 



On the posterior margin of the peduncle of the uropods there is a small median 

 dorsal spine and another at the external angle. The bifurcate process from the 

 inferior margin consists of a pair of long curved spines, of which the inner is only very 

 slightly longer than the outer, and on the margin inside the process there is also 



