8o Memoirs of the Indian Museum. [Vol. IV, 



bifurcated anteriorly for only two-sevenths of its length in front of the cervi- 

 cal groove ; the distance between the small mid-dorsal pit and the base of 

 the fork is more than half the length of the bifurcated part and is far greater 

 than in typical examples. 



2. The rostrum is proportionately broader and its apex is more rounded anteriorly. 



3 . The corneal and peduncular axes of the eye seem to be a trifle less oblique and 



the corneal index, as might be expected in so large a specimen, is greater : 

 53- 

 In other respects, however, the specimen agrees very closely with typical examples. 



As regards colour, spirit specimens are as a rule darker than those of the allied 

 species but the general plan is closely similar. The longitudinal grooves of the 

 carapace, the lateral margins of the rostrum, and the posterior margins of the last 

 three thoracic and first four abdominal somites are rather broadly marked with black 

 pigment. The median carina of the carapace is also defined by similar pigment, but 

 much less distinctly. The abdominal somites are rather thickly strewn with black 

 chromatophores, which in most cases form decided patches along the inner aspect of 

 each lateral carina. These patches are specially well-marked on the fifth somite and 

 there is also in most cases, more particularly in young specimens, a pair of dark spots 

 in the middle of the second scmite. The pits and carinae on the dorsal surface of the 

 telson are defined by black pigment and the uropods are faintly suffused with the same 

 colour. 



I have been unable to find any structural character which will account for the 

 name which Wood-Mason chose for this species (see p. 19). 



There are thirty-five specimens of 5. stridulans in the Indian Museum : — 

 1 -^=^ i Nellore Coast, Madras; 80—110 fms., 



14 18' 15" N., 8o° 18' 30" E. 

 7035 ~ 40 Masulipatam Coast, Madras; 95 fms., 



15 56' 20" N., 8i° 26' 10" E. 

 6 *?ti3 Masulipatam Coast, Madias; 240 fms., 



I5°56' 50" N., 8i° 3o'3o"E. 

 3481 ~ 2 Orissa Coast ; 68 fms. 



3483 ~ 97 Orissa Coast ; 68 fms. 



^ Misaki, Japan. 

 10 r 



Only the above specimens are known. 



29, Squilla investigatoris, Lloyd. 

 Plate VI, figs. 67, 68. 



1907. Squilla investigatoris, Lloyd, Rec. Ind. Mus., I, p. 10. 



1908. Squilla investigatoris, Lloyd, Rec. Ind. Mus., II, p. 29, pis. ii and iii. 



This species is readily distinguished from its allies by the unusually large number 

 of teeth on the dactylus of the raptorial claw. In other respects it bears a close resem- 

 blance to the species of the preceding group. 



Investigator.' 



4<*. 



5 9 , 69 — 100 mm. 



; Investigator.' 



69 



, 41 — 92 mm. 



' Investigator.' 



29 



, 48 and 74 mm. 



Investigator.' 



id 1 , 



1 9 , 52 and 97 mm. 

 TYPES. 



Investigator.' 



3^: 



, 12 9 , 38—86 mm. 



A. Owston. 



IcJ, 



144 mm. 



