1896.] A. Alcock — Carcinological Fauna of India. 255 



from their base to near their hook-like tip : the tip of the dactylus 

 moves through an arc of over 120°. 



(4) the merus of the external maxillipeds is hardly more than 

 half the length of the ischium measured along its inner border. 



80. Myrodes eudactylus, Bell. 



Myrodes eudactylus, Bell, Trans. Linn. Soo. Vol. XXI. 1855, p. 299, pi. xxxii. 

 fig. 6, and Cat. Leucos. Brit. Mus. p. 13. 



Myra eudactyla, A. Milne Edwards, Nouv. Archiv. du Mus. X. 1874, p. 46, pi. iii. 

 fig. 3 : Haswell, Cat. Anstral. Crust, p. 123, 



Myrodes gigas, Haswell, P. L. S., N. S. Wales, Vol. IV. 1880, p. 52, pi. v. fig. 5. 



Myrodes eudactylus, Miers, 'Challenger' Brachyura p. 298 : A. Ortmann, Zool. 

 Jahrbuch., Syst. etc., VI. 1892, p. 576. 



Carapace convex, longitudinally-ovoidal, vrith a carina — indistinct 

 or obsolete in large adults — down the middle line ; its surface generally 

 smooth to the naked eye in large adults, but with numerous scattered 

 bead-like granules in the young ; its short posterior margin with a 

 petaloid tooth at either end, and overhung in the middle line by a 

 horizontal recurved spine ; its lateral margins defined by a finely- 

 beaded line. 



The front is truncated and broadly bidentate, and the subhepatic 

 region forms an independent facet, the raised pterygostomian edge of 

 which ends posteriorly at a sharp tooth. Between the hepatic and 

 branchial regions, on either side, is a shallow notch which is in con- 

 tinuity with a longitudinal groove in the side wall of the carapace. 



The external maxillipeds are closely scabrous, especially distally. 



The chelipeds are hardly If times the length of the carapace (with- 

 out spine), and though generally smooth to the naked eye in the adult, 

 have, in the young, the base of the arm, the outer edge of the wrist, 

 hand and dactylus, and the inner two-thirds of the upper surface of the 

 hand finely but distinctly granular : the arm is subtrigonal, and the 

 hand subglobular but much smaller at the distal end than at the base : 

 the fingers are slender and hook-like, much longer than the hand, finely 

 granular, of almost the same diameter from the base to the hook-like 

 tip, and are armed on the opposed edges with fine teeth with larger 

 lancet-like teeth at distant intervals : the movable finger opens in a 

 horizontal plane, but it moves through an arc of between 120° and 130°. 



The legs are slender, and have both edges of the dactylus, and the 

 dorsad edge of the propodite, fringed with close shortish stiffish 

 hairs. 



The abdomen of the male is four-jointed, the penultimate piece 

 carrying a subterminal denticle : that of the female consists of 6 separate 

 pieces. 



