1898.] A. Alcock — Garcinological Fauna of India. 81 



Carpilodes, Dana, A. Milne Edwards. 



Carpilodes, Dana, Silliman's Amer. Journ. Sci. and Arts, (2) XII. 1.851, p. 126, and 

 Proc. Acad. Nat. Sci. Philad. VI. 1852, p. 77, and U. S. Expl. Exp. Crust, pt. I. p. 192. 



Carpilodes, Alph. Milne Edwards, Nouv. Archiv. du Mus. I. 1865, p. 224 (et 

 synon.) 



Carpilodes, Miers, Challenger Brachyura, p. 133. 



Carpiloxanthus, Alph. Milne Edwards in Maillard's Pile Reunion, Annexe F, 

 p. 3. (A. M. E.) 



Carapace very broad, convex in both directions, with tbe regions 

 generally well demarcated and — especially in the anterior half — sub- 

 divided into lobular areolae ; its antero-lateral borders usually sub- 

 divided into four broad, shallow, rounded lobes ; its postero-lateral 

 borders straight, or a little concave, and strongly convergent. 



Front broad ( about a third the greatest breadth of the carapace) 

 obliquely deflexed, grooved and slightly notched in the middle line, but 

 not distinctly bilobed. 



Orbits small, with entire margins, but usually with the three suture 

 lines near the outer angle more or less distinct: eye-stalks short and thick. 



Antennules folding obliquely, almost transversely. Basal antennal 

 joint running up between the front and the lower orbital plate much as in 

 Carjpilius; the flagellum rather longer than the major diameter of the orbit. 



Anterior edge of merus of external maxillipeds almost transverse. 



Chelipeds equal or subequal in both sexes : fingers pointed, but 

 distinctly grooved or hollowed near the tips. 



Abdomen of the male five- jointed, the 3rd-5th somites fused. 



Small crabs, easily recognizable by their short broad convex 

 carapace, with its antero-lateral margins in the form of four broad 

 shallow rounded lobes, its postero-lateral margins strongly convergent, 

 and the broad deflexed rather prominent and convex front. 



Key to the Indian species of Carpilodes. 



I. Surface of carapace quite smooth to the naked eye : — 



i. Upper border of meropodites of legs crest-like ... C. lophopus. 

 ii. Upper border of meropodites of legs not crest-like : — 

 1. Posterior part of carapace not lobulated : — 



a. Gastric region subdivided into three 



lobules only ... ... ... C. tristis. 



b. Gastric region subdivided into five 

 lobules : — 



a. Outer surface of wrist and 



hand smooth ... ... C. venosus. 



j8. Outer surface of wrist nodular, 



of hand granular... ,,. C. stimpsoni. 



2. The whole of the carapace divided into a 



network of lobules by fine lines ... C. pediger. 



J. II. 11 



