Carcinological Fauna of India. 285 



rostrum is obsolete, not breaking the general oval outline. The eyes 

 are small; and the orbits are nearly circular, with two sutures in the 

 upper border, and a hiatus at the inner inferior angle, which is filled 

 by the second joint of the antennary peduncle. 



The antennulary fossae are squarish, and are nearly filled by the 

 large angular basal joint, internal to which the rest of the antennule 

 folds obliquely. 



The basal antennal joint is oblong and angular, and reaches to the 

 internal orbital canthus : the antennary flagella are rudimentary. 



The external maxillipeds completely close the buccal frame: their 

 inner border is extremely straight and sharp cut : their palp is inserted 

 at the antero-internal angle of the merus, and folds out of sight. 



The chelipeds are about equal in length to the carapace : they 

 have somewhat the Lambrus form — having sharply prismatic joints 

 and large inturned fingers, but are concave on the upper surface. 



The ambulatory legs are short, aud decrease gradually in length : 

 they are all strongly dentate-carinate, or cristate. 



The abdomen of the female (and young male) consists of seven 

 segments. 



Oethra scruposa, L. 



[Cancer scruposus, Linn., Mus. Lud. Ulr., p. 450.] 

 Cancer polynome, Herbst, III. ii. 23, tab. liii. figs. 4-5. 

 [Oethra depressa, Lamk., Hist. Anim. Sans. Vert., V. 265.] 

 Oethra depressa, Desmarest, Consid. Crust., p. 110, pi. x. fig. 2. 

 [Oethra depressa, Guerin, Icon. R. A., pi. xii. fig. 3.] 

 Oethra scruposa, Milne-Edwards, Hist. Nat. Crust., I. 371. 

 Oethra scruposa, Cuv., R. A., pi. xxxviii. fig. 2. 



Oethra scruposa, Stimpson, Proc. Ac. Nat. Sci., Philad., 1857, p. 221. 

 Oethra scruposa, A. M.-Edw., in Maillard's Tile Reunion, Annexe F., p. 3 • and 

 Nouv. Archiv. du Mus., VIII. 1872, p. 263. 



Oethra sc7-uposa, Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 351. 

 [Oethra scruposa, F. Muller, Verb.. Ges., Basel, VIII. 473.] 



(Oethra scruposa, var. scutata A. Milne-Edwards, Miss. Sci. Mex., Crust., I. p. 

 170, pi. xxxi. fig. 2= Oethra scutata, S. I. Smith, Amer. Journ. Sci., etc., XLVIII. 

 1869, p. 120; and Ann. Mag. Nat. Hist., 1869, Vol. IV. p. 230, is considered by M. 

 A. Milne-Edwards to be only a variety of the Linnasan type.) 



The antero-lateral borders are divided into 6 or 7 indistinct lobes 

 by deep narrow sutures, each fold being again subdivided near the 

 edge by a faint crest. 



The gastric region is extremely prominent, and is divided into two 

 lobes by a broad longitudinal channel, each lobe being sparsely granular : 

 the branchial regions are also somewhat convex near their middle the 

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