40 A. Alcock — Carcinological Fauna of India. No. 1, 



Carapace appreciably convex, but shaped and sculptured as in 

 N. hastatoides. Front very distinctly prominent beyond the inner 

 supra-orbital angles and beyond the epistome, cut into four teeth of 

 which the middle two are somewhat smaller narrower and less promi- 

 nent than the others. 



The supra-orbital border is not fissured, but the orbits otherwise, 

 and the eyes, are as in N. hastatoides. 



Antero-lateral border cut into 9 teeth (including the onter orbital 

 angle) of which the first 2 or 3 are very small and inconspicuous and 

 the next 5 or 6 small, the last being a spike usually from a third to 

 half the breadth of the carapace proper in length. The posterior bor- 

 der is straight and forms an acutely dentiform angle of junction with 

 the postero-lateral borders. 



The merus of the external maxillipeds is narrow and has its antero- 

 external angle simply rounded, not produced laterally. 



The chelipeds in the adult male are rather more than 2 J times 

 the length of the carapace, but are otherwise similar to those of 

 N, hastatoides, except that the second spine of the hand is placed a good 

 way behind the finger-joint. 



There is a spine near the far end of the posterior border of the 

 merus of the last pair of legs. 



The 2nd and 3rd abdominal terga in both sexes are transversely 

 carinate, the carinas being of no great depth but very elegantly denti- 

 culate. The length of the 6th tergum of the male is not much more 

 than its greatest breadth. 



A small species : egg-laden females are 6'5 millim. long and 16 

 millim. broad including spines, but males are nearly twice this size. 



In the Indian Museum are 6Q specimens, from the Madras coast, 

 Andamans, G. of Martaban, Arakan coast, and Muscat. Most of them 

 come from over 20 fathoms. 



The specimen figured by Miers has abnormally short lateral epi- 

 branchial spines. 



20. Neptunus {Hellenus) longispinosus (Dana). 



Amphitrite longispinosa, Dana, Proc. Ac. Nat. Sci. Philad. 1852, p. 84, and 

 U. S. Expl. Exp. Crust, pt. I. p. 277, pi. xvii. figs. 2 a-c. 



Neptunus longispinosus, A. Milne Edwards, Archiv. du Mus. X. 1861, pp. 337, 

 339. 



Xiphonectes longispinosus, Miers, Challenger Brachyura, p. 183 : J. R. Hender- 

 son, Trans. Linn. Soc, Zool., (2) V. 1893, p. 370. 



Amphitrite vigilans, Dana, Proc. Ac. Nat. Sci. Philad. 1852, p. 84, and U. S. 

 Expl. Exp. Crast. pt. I. p. 278, pi. xvii. figs. 3 a-d. 



Heptunus vigilans, A. Milne Edwards, Archiv. du Mus. X. 1861, pp. 336, 339 



