28 A. Alcock — Carcinologlcal Fauna of India. [No. 1, 



Vile Reuuion, Annexe F p. 2 : Hess Arcliiv. f. Naturges. XXXI. 1865, i. pp. 139, 172: 

 Heller, Novara Crust, p. 27 : Miera, Crust. New Zealand, p. 27: Hilgendorf, MB. 

 AK. Berl. 1878, p. 799 : E. Nauck, Zeits. Wiss. Zool. XXXIV. 1880, p. 59, pi. i. 

 figs. 22, 24 (gastric teeth) : Haswell, Cat. Austral. Crust, p. 79 : Miers, Ann. Mag. 

 Nat. Hist. (5) V. 1880, p. 238; and Zool. H. M. S. Alert, pp. 518, 538; and Challenger 

 Brachyura, p. 185 : Filhol, Crust. N. Zel., Miss, ile Campbell, p. 382 : de Man, 

 Archiv. Naturges. LIIT. 1887, i. p. 332; and in Weber's Zool. Ergebn. Niederl. Ost. 

 Ind. IT. 1892, p. 285 : Cano, Boll. Soc. Nat. Napol. III. 1889, p. 215 : Ortmann, 

 Zool. Jahrb. Syst. VII. 1893, p. 78, and in Semen's Forschungsr. (Jena-Denk, 

 VIII.) Crust, p. 45 : Henderson, Trans. Linn. Soc. Zool., (2) V. 1893, p. 372. 



Scylla tranqueharica, Dana, U. S. Expl. Exp. Crust, pt. I. p. 270 : Stimpson, 

 Proc. Ac. Nat. Sci. Philad. 1858, p. 38. 



? Achelous crassimanus, Macleay 111. Annulosa. S. Afr. p. 61, (sec. A. M. E.). 



Carapace about |, or a little less, as long as broad, practically 

 smooth, except for a faint granular ridge running obliquely inwards 

 across either branchial region from the last spine of the anfcero-lateral 

 border. 



Front cut iuto four lobes or bluiitish teeth of about equal size and 

 prominence. Anfcero-lateral borders cut into 9 sharply acuminate teeth 

 of about equal size: posterior border forming a curve with the postero- 

 lateral borders, the points of junction sometimes slightly thickened. 



Merus of external maxillipeds oblique but not having the antero- 

 external angle distinctly produced in a lateral direction. 



Clielipeds not quite twice the length of the carapace in the adult 

 male, but shorter than this in the female and young male. Arm with 

 3 spines on the anterior border, and 2 on the posterior border — one 

 terminal, the other submedian : a strong spine at inner angle of wrist, 

 the outer angle being rounded and armed with one, or sometimes two, 

 small spines or teeth : hand with 3 spines or tubercles, one being in front 

 of the apex of the wrist-joint, the other two being side by side behind 

 the finger- joint —(the outer of these two is sometimes obsolescent). 



Legs unarmed. 



Abdomen of male broadly triangular. 



An extremely common crab in all the estuaries and backwaters of 

 India, from Karachi to Mergui. It grows to a large size. 



In young specimens the frontal lobes are broad and indistinct, the 

 upper surface of the palm is traversed by two faint but distinct longi- 

 tudinal cosfcse, and there may be a transverse granular line across the 

 gastric region. 



This is the common edible crab of India. 



Neptunus, De Haan, A. Milne Edwards, MIers. 



Neptunus, De Haan, A. Milne Edwards, Ann. Sci. Nat., Zool., (4) XIV. 1860, 

 p. 226 and Archiv. du Mus. X. 18G1, p. 314 {uli syn.) 



