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



The following two small specimens may probably be referred to this species; 

 they differ, however, from the other examples in having the lateral margins of the 

 rostrum rather strongly convergent : — 



^ Port Blair, Andaman Is. J. Wood-Mason. i <$ , 26 mm. 



^ Persian Gulf, 53 fms., 'Investigator.' 19,31mm. 



26° 20' N., 53 e 54' E. 



The following specimens from the British Museum collection have also been 

 examined : — 



Holothuria Bank, China Seas. P. Basset Smith. 1 d , 43 mm. 



(Pocock, 1893, sub S. affinis.) 

 The anterior bifurcated part of the median carina of the carapace is obsolete. 

 Kowlson Bay, Hongkong. P. Basset Smith. 1 <s , 44 mm. 



(Pocock, 1893, sub S. affinis.) 

 Port Darwin, N. Australia. 'Alert.' 1 d , 61 mm. 



(Miers, 1884, sub S. nepa.) 

 Singapore. S. F. Flower. 1 d , 92 mm. 



The var. per pensa is distributed over an area extending from Hongkong and N. 

 Australia to the Persian Gulf, entirely replacing the typical form in the western part 

 of its range. I have seen no specimens from Japan or the northern coasts of China. 



25. Squilla interrupta, Wood-Mason, MS. 



Plate V, figs. 60—62. * . 



? 1852. Squilla oratoria, Dana, U.S. Explor. Exped., Crust., I, p. 621. 

 1893. Squilla affinis, Henderson, Trans. Linn. Soc, Zool. (2), V, p. 453 (partim). 



Squilla interrupta, Wood-Mason, MS. (partim). 

 1908. Squilla interrupta, Lloyd, Rec. Ind. Mus., II, p. 32 (partim; sine desc). 

 1911. Squilla interrupta, Kemp, Rec. Ind. Mus., VI, p. 98. 



This species differs from S. oratoria, s. s . in the following constant characteristics: — 



1. The median carina of the carapace is interrupted at the base of the anterior 



bifurcation as in 5. oratoria var. perpensa (fig. 60). 



2. The rostrum is subquadrate ; its anterior margin is truncate (sometimes even a 



trifle concave) and its lateral margins are only very slightly convergent ante- 

 riorly (fig. 60). 



3. The eyes are distinctly smaller than in 5. oratoria or its variety, specimens of 



similar size being compared. In the smallest examples in the collection 

 the corneal index is about 5 - o, in the largest about 6'i, while in individuals 

 between 80 and 90 mm. in length, the figure usually falls between 5-2 and 5-5. 



4. The carpus of the raptorial claw is constantly provided with two, and only two, 



dorsal tubercles (fig. 61). 



5. In the bifurcate process from the base of the uropod the margin of the longer 



spine anterior to the external lobe is never concave ; it is occasionally feebly 

 sinuous, but in nearly every instance is definitely convex (fig. 62). 



