1895.] A. Alcock — Carcinological Fauna of India. 287 



The chelipeds are stout but short, the legs are compressed, aud 

 both are armed with large laminar spines of the same type as those 

 that form the rostrum and the antero-lateral margins of the carapace. 

 The ambulatory legs are subchelate much as in Acanthonyx. 



Zebrida adamsii, White. 

 Zebrida adamsii, White, P. Z. S., 1847, p. 121 ; and Ann. Mag. Nat. Hist., 1848, 

 Vol. I. p. 223 ; and ' Samarang ' Crustacea, p. 24, pi. vii. fig. 1. 



Zebrida adamsii, J. E. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 351. 



Zebrida longispina, Haswell, P. L. S., N. S. Wales, Vol. IV. 1879, p. 454, 

 pi. xxvii. fig. 3 ; and Cat. Austral. Crust., p. 38. 



Body of a light delicate madder pink, the carapace with darker 

 (liver-coloured) parallel longitudinal bands and alternating streaks, the 

 legs and chelipeds with broad somewhat oblique cross-bands of the 

 same darker colour : the median longitudinal dark band, and a band on 

 either side of it, extend, discontinuously, from the carapace along the 

 abdomen. 



The entire integument of the body and limbs is smooth, hard, and 

 polished. The chelipeds are stout, with short squat joints : the arm is 

 trigonal with sharp-cut laminar edges, the upper and lower of which 

 end in sharp teeth ; its broad distal end is also dentate : the wrist is 

 surmounted by three laminar teeth disposed in a triangle : the hand 

 has its upper edge raised into a compressed tooth. 



Of the ambulatory legs the 3rd, 4th, and 5th joints are strongly 

 compressed, with the upper edges sharply and acuminately carinate ; 

 the fifth joiut is enlarged distally, and the strongly recurved dactylus is 

 retractile against it in the manner of a subchela. 



In the Museum collection are a male and female from the coast of 

 Travancore. 



Eomedonus, Edw. 



Eumedonus, Edw., Hist. Nat. Crust., I. 349. 



Eumedonus, Miers, J. L. S., Zool., Vol. XIV. 1879, p. 670. 



Carapace depressed, pentagonal : rostrum large, strongly prominent, 

 bifurcate only near the tip. Orbits circular ; their internal hiatus occu- 

 pied by part of the antenual peduncle. Antennules foldiug obliquely ; 

 their basal joint of large size. 



Antennae entirely concealed beneath the front ; both the peduncle 

 and the flagellum short. Chelipeds more massive than the other legs, 

 and in the male much longer ; armed with large spines. Ambulatory 

 legs compressed ; their third joint cristate ; the second pair a little 

 shorter than the third ; the fifth pair dorsal in position. The abdomen 

 in both sexes consists of seven separate segments. 



