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



Key to the Indian species of Euxanthus. 



1. Lobules of carapace almost smooth ; outer angle of 



orbit not marked by a denticle E. melissa. 



2. Lobules of carapace rough ; outer angle of orbit 



marked by a denticle E. sculptilis. 



37. Euxanthus melissa, (Herbst). 



Cancer exsculptus, Herbst, Krabben, I. ii. 265, pi. xxi. fig. 121. 



Cancer melissa, Herbst, Krabben, III. ii. 7, pi. Ii. fig. 1. 



Euxanthus melissa, Stimpson, Proc. Ac. Nat. Sci. Phila. 1858, p. 33 : A. Milne 

 Edwards, Nouv. Archiv. du Mus. I. 1865, p. 293 : Targioni Tozzetti, Magenta Crust. 

 p. 27, pi. iii. figs. 1-7 : P. Mailer, Verh. Ges. Basel, VIII. p. 474 : J. R. Henderson, 

 Trans. Linn. Soc, Zool., (2) V. 1893, p. 359 : Ortmann, Zool. Jahrb. Syst. VII. 

 1893-94, p. 466, pi. xvii. fig. 9. 



Cancer mamillatus, Miine Edwards, Hist. Nat. Crust. I. 376. 



Melissa mamillata, Strahl, Archiv. fur Naturges. XXVII. 1861, i. p. 103. 



Euxanthus mamillatus, A. Milne Edwards, Nouv. Archiv. du Mus. I. 1865, p. 292, 

 pi. xv. figs. 2-2b ; and IX. 1873, p. 196 : Haswell, Cat. Austral. Crust, p. 48 : de Man, 

 Journ. Linn. Soc, Zool., XXII. 1887-88, p. 30. 



Euxanthus nitidus, Dana, Proc. Ac. Nat. Sci. Phila. 1852, p. 75 ; U. S. Expl. 

 Exp., Crust, pt. I. p. 174, pi. viii. figs. 9a-h. (yoong). 



Melissa nitida, Strahl, Archiv. fur Naturges. XXVII. 1861, i. p. 103. 



Cancer exsculptus, Hoffmann in Pollen and Van Dam, Faun. Madagasc. Crust, 

 p. 38. 



? Euxanthus exsculptus var. rugosus, Miers, Zool. H. M. S. Alert, pp. 517, 527 

 (? young.) 



The lobules of the carapace are extremely convex, and though 

 some of them may be a little dimpled, especially in the young, they are 

 commonly smooth. 



The an tero- lateral borders are cut into five teeth, but there is often 

 a tubercle — which may be incompletely doable — between the 4th and 

 5th teeth ; between the 3rd and 5th teeth the margin is finely granular. 



The curve of the orbit is unbroken by any denticle at the outer 

 angle, and is smooth, not granular. 



The outer surfaces of the wrist and hand, as of the corresponding 

 joints of the legs, are nodular, the nodules and the hollows between them 

 being smooth : on the lower outer surface of the hand are two longi- 

 tudinal wrinkles which also have a smooth surface. The fingers have 

 their surfaces smooth, and their cutting edges strongly toothed, with 

 the tip distinctly hollowed out. 



Colours of good spirit specimens : stone grey or yellowish, with 

 numerous tiny chocolate-brown or purplish specks, and some large 

 blotches of the same colour on the gastric, hepatic and branchial regions. 

 These markings have faded in spirit specimens that have been preserved 



