1913-] S. Kemp: Crustacea Stomatopoda of the Indo-Pacific Region. 119 



The lateral margins of the fifth thoracic somite are greatly compressed antero- 

 posteriorly and form a thin outstanding blade which, in dorsal view, looks like a spine. 

 The sixth and seventh somites are rounded antero-laterally, while their postero-lateral 

 angles are almost rectangular. The basal segment of the last three thoracic limbs bears 

 a short stout tooth on its external aspect. The first five abdominal somites are dorsally 

 smooth and their postero-lateral angles do not project backwards as spines. The sixth 

 somite possesses a shallow longitudinal groove on either side and its postero-lateral 

 angles are sharply spinous. 



The telson is semicircular in shape and is more than twice as broad as long. On its 

 dorsal surface near the distal margin it is provided with a transverse series of three 

 short but acute spines ; the two lateral form the terminations of carinae, while the 

 median is situated at the end of a rather conspicuous lobe. The submedian, intermediate 

 . and lateral marginal spines are well developed. The submedians are movable and the 

 edge between them, which is slightly emarginate, bears four to seven minute denticles. 

 There are two spines, the outermost of which is the largest, between the submedians 

 and intermediates, and one between the intermediate and the lateral. The ventral 

 surface of the telson is smooth. 



The basal segment of the uropod bears a single dorsal spine on its distal margin, 

 projecting over the articulation of the inner segment of the exopod. The outer spine 

 of the bifurcate process (fig. 94). is enormously larger than the inner ; it is broad, very 

 greatly expanded laterally, and is deeply keeled ventrally. The inner spine of the 

 process is, in the type specimen, represented merely by a small rounded lobe ; it is 

 larger and sharply spinous in an example from New Zealand. In addition, there is 

 another small ventral spine at the inner distal angle of the basal segment which pro- 

 jects over the base of the inner uropod. The proximal segment of the exopod bears 

 a single spine ventrally and distally and a series of five or six, which are movable, along 

 its outer margin. Of these spines the two outermost are long and recurved. 



Chilton ( 1 891, p. 66) has given an account of the adult colouration. There is, it 

 appears, a very great difference in this respect between the two sexes, for the male is 

 greyish in general tone, while the carapace of the female is similar, but darker, and the 

 whole of the central part of the abdominal segments is coloured a bright red. I,an- 

 chester (1901) notes that the small specimens which he examined were suffused with 

 rosy red and sprinkled with red and black spots, the latter forming two conspicuous 

 black marks over the submedian marginal spines of the telson. From these two accounts 

 it is clear that the transverse bars of blue pigment that characterize the majority of the 

 species of Lysiosquilla are entirely absent in L. spinosa. No trace of the original colour 

 remains in the case of the two specimens preserved in the Indian Museum. 



For the elucidation of the synonymy of this species we are indebted to Chilton 

 who has been able to examine the type specimens of 5. laevis, S. indefensa and 5. tri- 

 dentata. The latter species was described from a specimen 75 inches in length and 

 it possesses only four teeth on the dactylus of the raptorial claw. It is probable, as 

 Chilton remarks, that it is a young individual, but nevertheless, on the assumption that 

 it is to be referred to L. spinosa, it is not very easy to account for the small number of 



