Carcinoloyical Fauna of India. 271 



The characters that distinguish this species are constant through- 

 out the series, without any modification or variation. 



Greatest length of carapace in ovigerous female ... 15 millim. 



Do. breadth do. do. do. ... 15 millim. 



Length of chelipeds in ovigerous female ... 52 millim. 



Lambrus (Rhinolambrus) petalophorus, n. sp. 



Carapace of the same general shape as in L. turriger, but broader 

 posteriorly, where its breadth exceeds its length with the rostrum. The 

 hepatic region is extremely well demarcated, not by its prominence, but 

 by its almost vertical outer wall. 



The cristiform an tero- lateral border, which runs from the angle of 

 the buccal frame outside the limit of the hepatic region, is festooned by 

 7 or 8 close-set thin teeth, and there is a strong upcurved spine at the 

 postero-lateral angle. 



The postero-lateral border carries three teeth, the innermost of 

 which is hardly less prominent than that at the postero-lateral angle: 

 the posterior border is finely denticulated. 



The rostrum, the breadth of which is about f the greatest breadth 

 of the carapace, is elegantly trilobed. 



The regions of the carapace are strongly elevated, and have the 

 surface pitted or reticulated : in the middle line on the gastric region is 

 a single erect conical spine, on the cardiac region two ; and on either 

 branchial region there is a spine. In front of the gastric spine are two 

 spinelets, disposed transversely. 



The supra-orbital margin is strongly arched, and the infra-orbital 

 lobe is cut into two elegantly crimped leaflets or petals. 



The post-ocular constriction is distinct. 



The chelipeds in the male are four and-a-half times the length of 

 the carapace and rostrum : the arm is slender and subcylindrical, with 

 a line of many spinules along both the inner and outer borders, a 

 broken line of sharp tubercles along its upper surface, and a line of 

 granules along its lower border, but is otherwise smooth and polished : 

 the carpus has a few coarse spinules on its outer surface : the hand 

 though distinctly trigonal, is long and slender, but is enlarged at the 

 far end ; its inner and outer borders are irregularly and unequally 

 laciniated, the teeth becoming larger and closer set towards the far 

 end ; except for a line of beading along its low T er border and an occa- 

 sional spinule on its upper surface, its surfaces are smooth and polished : 

 the movable finger has its broad base denticulated. 



The ambulatory legs are very slender and very short — only one- 

 117 



