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



on the abdomen. The shortness of the anterior lateral process of the sixth thoracic 

 somite is paralleled in the two remarkable specimens from Amoy. 



Squilla oratoria is evidently an abundant species in Chinese and Japanese waters, 

 but is perhaps scarce in other localities. Apart from the record from Mauritius, which, 

 for the present at least, may be regarded as doubtful, it is only known from the 

 Hawaiian and Philippine Is. The probability of confusion with one or other of the 

 succeeding forms is so great that little reliance can be placed on the localities given in 

 the literature. 



var. perpensa 1 , Kemp. 

 Plate V, figs. 57-59. 

 1880. Squilla nepa, Miers, Ann. Mag. Nat. Hist. (5), V, p. 25 (partim). 

 1884. Squilla nepa, Miers, Voy. H.M.S. < Alert', p. 298. 

 1888. Squilla nepa, de Man, Journ. Linn. Soc, XXII, p. 295. 

 1893. Squilla affinis, Pocock, Ann. Mag. Nat. Hist. (6), XI, p. 474. 



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

 1908. Squilla interrupta, Lloyd, Rec. Ind. Mus. ii, p. 32 (sine desc). 

 191 1. Squilla oratoria, var. perpensa, Kemp, Rec. lud. Mus., VI, p. 98. 

 Under this name I separate the form of Squilla oratoria which occurs on the coasts 

 of British India. In these localities the variety exists to the complete exclusion of the 

 typical race, but both forms occur together on the coasts of S. China. 



The var. perpensa may be easily distinguished from the typical form by two 

 characters : — 



1. The median carina of the carapace is always interrupted, and wholly absent for 



a short space, at the base of the anterior bifurcation (fig. 57). The two arms 

 of the bifurcate portion are frequently fine and obscure and, in a few speci- 

 mens, quite obsolete. 



2. The carpus of the raptorial claw has a sharp elevated carina on its dorsal aspect 



which terminates abruptly before reaching the anterior margin ; apart from 

 this, there is no trace whatever of any dorsal tubercle (fig. 58). 

 The variety also differs from most examples of the typical form in the more quad- 

 rate shape of the rostrum, the apex of which is squarely truncate or even a trifle con- 

 cave. The lateral lobes of the sixth somite sometimes bears the closest resemblance 

 to those of oratoria, s.S., more usually the anterior is broader, more pointed and less 

 parallel-sided. The anterior lobe of the seventh somite is usually clearly longer than 

 in the allied form (fig. 57). 



The following abdominal carinae end in spines : — 



Cannae. Abdominal somites. 



Submedian . . . . . . 5, 6. 



Intermediate .. .. .. 4,5,6. 



Lateral .. .. . . 3, 4, 5, 6. 



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



On the telson there are three or four submedian denticles, six to nine intermediate 

 and one lateral. 



1 See addendum, p. 196. 



