82 A. Alcock — Carcinological Fauna of India. [No. 1, 



(f). A spine near far end of 

 posterior border of nierus of 



last pair of legs N. spinipes. 



b. A single true spine on posterior 

 border of arm : — 

 IT. Middle teeth of front very 

 mnch smaller and less pro- 

 minent than the outer : three 



spines on hand N. longispinosus, 



j8. Middle teeth of front nearly 

 as large as, and more pro- 

 minent than, the outer : two 



spines on hand N, tuherculosus. 



<p. Teeth of front obsolescent: 



no spines on hand N. hroclcii. 



B. Last spine of antero- lateral border either hardly 

 larger or even smaller than any of the others 



(ACHELOUS) : — 



1, Carapace granular, last spine of antero- lateral 



border slightly the largest JV. granulatus. 



2. Carapace polished, last spine of antero-lateral 



border slightly smaller than the others JV. 07-bicularis, 



II. Hand slender, much less massive than arm CLupocyclq- 

 poRUs) : 



1. Front cut into four teeth of nearly equal size, 

 of which the middle two are the most pro- 

 minent N, whitei. 



2. Front cut into four lobes, of which the middle 

 two are much the smaller and are hardly more 



prominent than the others N. gracilimanus. 



Dr. J. R. Henderson includes Neptunus sieholdi, A. Milne Edwards (Archiv. du 

 Mus. X. 1861, pp. 323, 339, pi. xxxv. fig. 5), which according to de Man is identical 

 with N. convexus De Haan, in the Indian Fauna. It appears to belong to the sub- 

 genus Neptunus, and is distinguished by the uniformity of size and shape of the 

 frontal teeth, by the small size of the last spine of the antero-lateral border, and by 

 the absence of any spine on the posterior border of the arm. 



11. Neptunus sanguinolentus, (Herbst). 



Cancer pelagicus, (part), Fabricius, Mant. Ins. I. p. 318, and Ent. Syst. II. 447. 



Cancer sanguinolentus, Herbst, Krabben, I. ii. 161, pi. viii. figs. 56, 57. 



Portunus sanguinolentus, Fabricius, Ent. Syst. Suppl. p. 367 : Bosc, Hist. Nat. 

 Crust. I. p. 220 : Latreille, Encyc. Meth. X. p. 190. 



Lupa sanguinolenta, Desmarest^ Diet. Sci. Nat. XXVIII. p. 224, and Consid. 

 Gen. Crust, p. 99 : Milne Edwards, Hist. Nat. Crust. I. 451 and in Cuvier Regne Au. 

 pi. X. fig. 1: Lucas Hist. Nat. Anim. Art. Crust, p. 101 : Dana, U. S. Expl, Exp. 

 Crust, pt. I. p. 271 : Stimpson, Proc. Ac. Nat. Sci. Philad. 1858, p. 38 : Tozzetti, 

 "Magenta" Crust, p. 68. 



Neptunus sanguinolentus, De Haan, Faun. Japon. Crust, p. 38 : A. Milne 

 Edwards, Archiv. du Mus. X. 1858-1861, pp. 319, 339, and in Maillard's I'ile Reunion, 



