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



II. Part or all of the surface of the carapace covered with 

 vesiculous granules plainly visible to the naked eye : — 

 i. Posterior part of the carapace not lobulated : — 



1. The whole of the carapace covered with 



granules ... ... ... ... C. rugatus. 



2. Only the antero-lateral part of the carapace 



granular ... ... ... ... C. vaillantianus. 



ii. Posterior part of the carapace more or less divided 

 into lobules by transverse grooves : the whole surface 

 of the carapace densely granular : — 



1. A single transverse furrow behind the gastric 



region ... ... ... ... C. margaritatus. 



2. Two transverse furrows (exclusive of one 

 that helps to form the raised posterior 

 margin) behind the gastric region : — 



a. Branchial lobules few, long, roll-like... G. monticulosus. 



b. Branchial lobules many, small, nodule- 

 like ... ... ... C. cariosus. 



3. Oarpilodes tristis, Dana. 

 Carpilodes tristis, Dana, U. S. Expl. Exp. Crust, pt. I., p. 193, pi. ix. figs. 1a-d : 

 Heller, Novara Crust, p. 17 : Alph. Milne Edwards, Nouv. Archiv. du Mus. I. 1865, 

 p. 225, and IX. 1873, p. 178 : Haswell, Cat. Austr. Crust, p. 56 : F. Muller, Yerh. Ges. 

 Basel, VIII. 1886, p. 474 : de Man, Notes Leyden Mus. XII. 1890, p. 50 : J. R. 

 Henderson, Tr. Linn. Soc, Zool., (2) V. 1893, p. 353 : Ortmann, in Semon's Zool. 

 Forschungsr. (Jena. Denkschr. VIII) Crust, p. 51. 



Surface of carapace and appendages quite smooth to the naked eye, 

 but with a dull look due to uniform microscopic miliary granulation. 

 Gastric region delimited from the front, from the somewhat tumid 

 supra-orbital margins, and posteriorly, by shallow grooves, and sharply 

 demarcated from- the branchial regions by fine sharp-cut lines ; and 

 subdivided into three lobules by a fine sharp-cut _j_ shaped median 

 incision. 



Antero-lateral borders divided into four lobes, from the intervals 

 between which fine sharp lines run obliquely inwards to incompletely 

 subdivide the hepatic and branchial regions into lobules. Outer part 

 of hepatic regions on a plane slightly lower than that of the rest of the 

 carapace. 



Colours in spirit: uniform dull brownish-buff, except the fingers and 

 a large part of the lower border of the hand, which are black. 



79 specimens from the Andamans and Nicobars. 



4. Carpilodes stimpsoni, A. Milne Edwards. 

 Carpilodes stimpsoni, A. Milne Edwards, Nouv. Archiv. du Mus. I. 1865, p. 232, 

 pi. xi. figs. 2-2c, and IX. 1873, p. 181 : de Man, Archiv. fur Naturges. LIII. 1887, i. 

 p. 234, and Journ. Linn. Soc, Zool., vol. XXII. 1887-88, p. 25. 



