270 Garcinological Fauna of India. 



die line, one on the cardiac region in the middle line, and one on each 

 branchial region : there is sometimes a little spinule in front of the gas* 

 trie spine, and one in front of either branchial spine ; and on the pos- 

 terior border, in the middle line, are two divergent spines directed back- 

 wards. The rostrum is broad, concave between the eyes, somewhat de- 

 flexed, and may be described as trilobed near the tip — since it is there 

 suddenly truncated and continued in the middle line only. 



There is a distinct post-ocular constriction, and the hepatic regions 

 are well-defined laterally. 



The chelipeds are long slender and rugose : the arm is cylindrical, 

 and the palm subcylindrical, becoming enlarged and trigonal near the 

 fingers : in the male the chelipeds are from 4| to 5| times the length of 

 the carapace and rostrum, in the female they are but 3§ to 3^ times this 

 length. 



The ambulatory legs are long, very slender, and perfectly smooth. 



In the Museum collection are numerous specimens from the Anda- 

 mans, from the Madras coast, and from off Ceylon at 32 to 34 fathoms. 



There are undoubtedly two sorts of males : one sort resembling the 

 female in having the chelipeds comparatively short, the other sort hav- 

 ing very long' chelipeds. 





Lambrus (Tthinolambrus) cybelis, n. sp. 



This species closely resembles L. turriger, from which it differs 

 only in the following characters : — 



(1) the regions of the carapace are all more elevated, and on the 



cardiac region — one behind the other, in the middle line- 

 as well as on either branchial region, are two very large 

 semi-erect spines of equal size ; while in the middle of the 

 granular posterior border is a single spinule : 



(2) the surface of the carapace, besides being granular, is very 



evenly and regularly pitted or reticulated : 



(3) the rostrum, which is nearly one-third the greatest breadth 



of the carapace, is more distinctly trilobed : 



(4) the chelipeds (which in females and young males are only 



3J to 3| times the length of the carapace and rostrum), 

 though of the same general slender proportionsias'in L, 

 turriger, have the hand distinctly trigonal throughout, 

 and the arm and hand armed with sharp laciniated^ spines 

 on the upper aspect. 

 A young male from off Ceylon, 34fms., and two probably half-grown 

 males, and an ovigerous female, from off the Andamans, 41 to 86 fathoms. 



116 









