50 Memoirs of the Indian Museum. [Vol,. IV, 



rate lobe which is slightly emarginate at the apex (fig. 35). The antennular peduncle 

 is shorter than the median length of the carapace, excluding the rostrum. The mandi- 

 bular palp is entirely missing. 



The outer inferior margin of the merus of the raptorial claw (fig. 36) is bluntly 

 rectangular at its distal extremity. The carpus is deeply grooved externally and 

 the dorsal carina, which is high and entire, terminates abruptly before reaching the 

 anterior edge. The propodus possesses three movable spines at the base of its pecti- 

 nate margin and the opposite or inferior edge is, in both sexes, remarkable for its sharp 

 carina which is produced as a stout tooth at the distal end ; this tooth is not found in 

 any other species of Squilla. The dactylus itself is convex or feebly sinuous externally 

 and on its inner margin bears six curved teeth including the apical one (fig. 36). 



The dorsal surfaces of the exposed thoracic somites and abdomen are finely rugose. 

 The lateral margin of the fifth thoracic somite consists of a sharp anterior forwardly- 

 curved spine and a posterior lobe which is rather narrowly rounded at the apex. In 

 the possession of a bilobed margin on this somite, 5. laevis, along with fifteen other 

 species hereinafter described, differs conspicuously from any of the forms previously 

 mentioned. The pair of inferior spines found in most of the preceding species is 

 entirely absent. The lateral processes of the two succeeding somites are composed of 

 a single lobe, obliquely truncate in front and terminating in an acute but non- spinous 

 postero-lateral angle. The eighth somite is provided with a sharp antero-lateral tooth 

 (figs. 35, 37). The spines on the abdomen are disposed as follows : — 

 Carinae. Abdominal somites. 



Submedian . . . . . . 5, 6. 



Intermediate .. .. .. 5,6. 



Lateral .. .. .. .. (3) 4, 5, 6. 



Marginal .. .. .. 1,2,-3,4,5. 



The median carina of the telson is only very feebly notched at the base and the 

 symmetrical rows of pits are distinct on either side. There are two or three submedian 

 denticles, six to eight intermediate and one lateral. There is a carina at the base of 

 each marginal tooth and the carina which runs along the lateral edge of the telson, in 

 its anterior third, ends in a blunt praelateral denticle. There is no post-anal carina. 



The inner spine of the bifurcate process of the uropod is twice the length of the 

 outer and bears a small lobe on its outer edge just behind its middle point. The basal 

 segment of the exopod is only a trifle longer than the ultimate segment and bears 

 seven movable spines on its external margin. 



Secondary sexual distinctions are slight. In the adult male the raptorial pro- 

 podus is slightly more dilated than in the female ; and the dactylus in the former sex 

 is of a rather more clumsy build and has shorter and stouter teeth. 



The preserved specimens show no characteristic colouration. 



There are five examples of the species in the Indian Museum ; — 



7J2S--3P New South Waks D _ Q g tead- 3 ^ ^ 9T _ II9 mm> 



°y~ a Port Jackson, New South Wales. Australian Museum. 2 9 , 99 and 105 mm. 



Squilla laevis is at present only known from the coasts of New South Wales ; 

 it has been recorded from Port Jackson (Stead) and Sydney (Hess). 



