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



claws ; but as the specimen had sojourned, though evidently for a brief period only, 

 in the stomach of a fish, the pigmentation was perhaps somewhat modified. The black 

 pigment, which appears to be fairly permanent in alcohol, defines all the carinae of 

 the carapace and of the abdomen as far as the fourth somite. There are also dark 

 median transverse patches on the free thoracic and first two abdominal somites, ex- 

 tending laterally as far as the impressed line between the submedian and sublateral 

 carinae. The inner uropod and spines of the bifurcate process are tipped with black 

 and the terminal segment of the outer uropod is suffused with the same colour. 



Only three examples of Squilla supplex are known ; all are preserved in the Indian 

 Museum. 



Ç 8 Bombay. F. Stoliczka. i 3 , 45 mm. TYPE. 



^ Bombay. Bombay Nat. Hist. Soc. I 9 , 73 mm. 



7 -^ Tuticorin, S. India. J. Hornell. 1 tf , 79 mm. 



The last specimen was found in the stomach of Poly n emus tetradactylus , Shaw. 



31. Squilla costata, De Haan. 



Plate VI, figs. 70 — 72. 



1884 ? Squilla costata, De Haan, in Siebold's Fauna Japonica, Crust., atlas, pi. li, fig. 5. 



1849. Squilla costata, De Haan, ibid., text, p. 223. 



1880. Squilla costata, Miers, Ann. Mag. Nat. Hist. (5), V, p. 21. 



1894. Squilla costata, Bigelow, Proc. U. S. Nat. Mus., XVII, p. 511. 



1903. Chloridella costata, Rathbun, Proc. U. S. Nat. Mus., XXVI, p. 55. 



1910. Squilla costata, Fukuda, Annot. Zool- Japon., VII, p. 151. 



In this and in the succeeding form the lateral margins of the sixth and seventh 

 thoracic somites are bilobed as in the 5. quinquedentata and 5. nepa groups. By this 

 feature they are readily separated from 5. supplex, from which, as from all other species, . 

 they are distinguished at a glance by the profuse carination of the abdominal somites. 

 The principal characters of Squilla costata are as follows : — 



The carapace (fig. 70) is narrow and its breadth behind the antero-lateral angles 

 is about two-fifths its median length including the rostrum. The median carina is 

 distinct and is continuous in front of the well-marked cervical groove except for a gap 

 at the base of the short anterior bifurcation. Posterior to the cervical groove the 

 median carina is conspicuous and is bifurcate in its anterior two-thirds. The lateral and 

 intermediate carinae are distinct. Between the median carina and the gastric groove, 

 there are on each side numerous short carinules or tubercles. In the Burmese example 

 (fig. 70) they are disposed obliquely on the area in front of the cervical groove, but 

 behind it are situated transversely. In the Japanese specimen this feature is less 

 evident. Other tubercles occur on the sides of the carapace and are most distinct in 

 the posterior part. The antero-lateral angles are produced to strong spinous termina- 

 tions that extend as far as or a little beyond the level of the rostral base. The 

 rostrum is about as long as wide ; its upturned lateral margins are slightly convergent 

 and meet in a broadly rounded apex ; on its dorsal surface it is finely rugose or with 

 a few obscure tubercles and in the larger specimen there is a faint median carina. 



