1900.] A. Alcock — Cardiological Fauna of India. 349 



The length of the stridulating organ is much less than half the 

 greatest height of the palm : the organ consists of about a dozen distant 

 ridges much concealed in hair, and each ridge is sharply serrated. 



The scraper on the ischium is placed near the upper angle of the 

 inner face of that joint and consists of an elongate-elliptical longitudi- 

 nally-grooved cicatrix-like surface, with a patch of hair above it and a 

 much larger patch below it. 



The fingers of the smaller cheliped are almost as much dilated at 

 tip as those of 0. macrocera. 



The dactyli of the legs are dorso-ventrally compressed as in 

 0. platytarsis. 



There is a thick brush of hairs along the anterior surface of the 

 propodite of the first pair of legs only. 



The meropodites of the first three pairs of legs are not so broad as 

 in the three preceding species. 



In the Indian Museum are 29 specimens from the coasts of Cutch, 

 Sind, and Baluchistan. 



This is the largest Indian Ocypode, the carapace of the adult being 

 52 millim. long and 62 millim. broad. 



47. Ocypoda cordimana, Desm. 

 Ocypoda cordimana, Desmarest, Consid. Gen. Crust, p. 121: Milne Edwards, 

 Hist. Nat. Crust. II. 45 : Kingsley, Proc. Ac. Nat. Sci. Philad., 1880, p. 185 : de Man, 

 Notes Leyden Mus., III. 1881, p. 248: Miers, Ann. Mag. Nat. Hist. (5) X. 1882, 

 pp. 379, 387: Ortmann, Zool. Jahrb., Syst., X. 1897-98, pp. 359, 362 (ubi synon.). 



Carapace deep, quadrilateral, strongly convex fore and aft, its 

 length about seven-eighths its greatest breadth, which is some little 

 distance behind the orbits, owing to the gentle curve of the antero- 

 lateral borders : its antero-lateral angles coincide with the outer orbital 

 angles, and point acutely forwards. 



Orbits deep ; their upper border sinuous, but not in the least 

 oblique ; there is usually a notch near the middle of their lower border, 

 and always a deep gap at the outer angle. No terminal style to the 

 eyes. 



The lateral borders of the buccal cavern are anteriorly convergent 

 and have no outward curve. The marginal row of granules on the 

 outer surface of the ischium of the external maxillipeds is indistinct or 

 absent. 



Though the chelipeds and legs are rough and the roughness is in 

 places squamiform, there is no serration of their edges, except in the 

 case of the lower borders of the arms, the inner edge of the wrists, and 

 the lower border of the hands. The palm of the larger hand, though 

 deep, is not particularly compressed, and it has no stridulating ridge. 



