1899.] A. Alcock — Carcmological Fauna of India. 23 



Chelipeds very lon^, much longer than any of the legs, rather 

 slender, the hand slenderer than the arm : the arm with spines, both 

 inner and outer angles of wrist spiniform, the hand with spines and 

 costae, the fingers long and slender. 



Legs slender : propodite and dactylus of last pair typically folia- 

 ceous and blade-like for swimming. 



Abdomen of male five-jointed the 3rd-5th terga being fused : the 

 first tergum almost concealed beneath the carapace. 



Key to the Indian species of Lupocyclus. 



I. Frontal teeth blunt-pointed ; chelipeds less than three times 

 the length of the carapace, the arm being stout and 

 prismatic : merua of last pair of legs broadened and com- 

 pressed ... L. rotundatus. 



II. Frontal teeth acutely pointed : chelipeds more than three 

 times the length of the carapace, the arm being slender and 

 cylindrical: merus of last pair of legs slender ... ... L. strigosus. 



7. Lupocyclus rotundatus, Adams and White. 



Lupocyclus rotundatus, Adams and White, Samarang Crust, p. 47, pi. xii. fig. 4 : 

 A. Milne Edwards, Archiv. du Mus. X. 1861, p. 387 : de Man, Notes Leyden Mus. V. 

 1883. p. 153: Miers, Zool. H. M. S. Alert, pp. 184, 234, and Challenger Brachyura, 

 p. 186. See also de Man, Zool. Jahrb., Syst. etc., II. 1886-87, p. 718. 



? Goniosoma insequale, Walker, Journ. Linn. Soc, Zool., XX. 1886-90 (1887) 

 p. 116, pi. viii. fig. 4. 



? Lupocyclus inaequalis, Henderson, Trans. Linn. Soc. Zool. (2) V. 1893, p. 378, 



Carapace sub-circular in the young but becoming as much as five- 

 sixths as long as broad in large individuals, convex, subtomentose, its 

 surface broken by transverse granular ridges which are similar in 

 number and position to those of Neptunus (Lupocycloporus) whitei A. M. 

 Edw. but are more elevated and discontinuous and therefore look more 

 like series of tubercles. 



Front prominent beyond the dorsally-grooved, or reduplicated, 

 inner supra-orbital angles, cut into four teeth of not very unequal size, 

 of which the middle two are the most prominent and the most acute. 

 Supra-orbital margin with two sutures or not very open fissures. 



Antero-lateral borders cut into five rather coarse teeth (including 

 the outer orbital angle), and in every one of the interdental spaces there 

 is a denticle : these intervening denticles are so small in young indi- 

 viduals that some of them may escape notice, but in large individuals 

 they are all very distinct. Posterior border straight, but forming a 

 curve with the postero-lateral borders. 



