1895.] 



A. Alcock — Carcinological Fauna of India. 



265 



guislied by the large and numerous spines on their 3rd, 4th and 5th 

 joints. 



This species is not uncommon off the Orissa coast from 7 to 23 

 fathoms. 



Sub-genus Rhinolambrds, A. Milne-Edwards. 



Rhinolamlrus, A. Milne-Edwards, Miss. Sci. Mex., Crust., I. p. 148. 

 Lanibrus, Miers, ' Challenger ' Brachyura, p. 92 (part.). 



Carapace triangular, usually as long as broad, with a broad pro- 

 jecting somewhat declivous rostrum and a very distinct post-ocular 

 constriction ; surface of carapace very commonly, but not always, 

 spiny and granular. 



Key to the Indian speeies of the sub-genus Rhinolambrus. 



Chelipeds stout, 

 three times to 

 twice or less the-, 

 length of the cara- 

 pace and rostrum 



Carapace and 



chelipeds very 

 closely covered 

 with large rugged -={ 

 granules and 

 sharp ramose 

 spines. 



Carapace with 

 few depressed tu- I 

 bercles, or nearly ( 

 smooth : chelipeds •{ 

 with blunt teeth 

 or smooth gra- 

 nules. 



fi. Chelipeds nearly 

 three times the 

 length of the ca- 

 rapace and ros- 

 trum L. contrarius. 



Chelipeds not 

 two-and- a-half 

 times the length 

 of the carapace 

 l^_ and rostrum L. longispinis. 



fi. Chelipeds three 

 times the length 

 of the carapace 

 and rostrum L. pelagicus. 



. Chelipeds not 

 twice the length 

 of the carapace 

 and rostrum L. gracilis. 



II. Chelipeds slend- 

 er, three-and-a- 

 half to five times , 

 the length of the"* 

 carapace and ros- 

 trum. 



1. Carapace at least 

 as long as broad : 

 large erect turret- ■{ 

 like spines on the 

 carapace. 



fi. A single turret on 

 the cardiac region, 

 and on either 

 branchial region : 

 two large diverg- 

 ing spines in the 

 middle line on the 

 posterior border... 



L. turriger. 



. Two turrets on 

 the cardiac region, 

 and two on either 

 branchial region : 

 a single spinule 

 on the posterior 

 margin 



2. Carapace broader than long; 

 L. spines of ordinary form on the carapace 



L. cybelis. 



L. petalophorus. 



