806 Oarcinological Fauna of India. 



8. Libystes Edivardsi, n. sp. 

 ' Carapace, length about four-sevenths of the breadth, fiuely pitied 



uuder lens, somewhat granular near tlie antero-lateral borders : an 

 angular eminence near either posterior angle and a slight concavity of 

 the postei'O-lateral part of the lateral epibranchial I'egious give the 

 carapace a somewhat quadrilateral cast. 



Front a good deal less than a third the breadth of the carapace, 

 perfectly straight, faintly notched in the middle line. Eyes small. 



Antero-lateral borders of the cai*apace with 5 or 6 granular denticles 

 followed by a sharp procurved spine. 



The chelipeds have the hands unequal in the adult, They are 



X, V more than three times the length of the carapace and are smooth 



^ J^ and unarmed. The fingers are slender and hooked at tip, especially in the 



j^vj smaller hand : they are a good deal longer than the palm in the smaller 



V ^ JV hand, and about as long as the palm in the larger hand. On the 



^^^fcsko J^ immobile finger of the smaller hand there ai'e several irregular enlarged 



^ y teeth. [In the young, as in Catoptrus, the hands are nearly equal, and 



"^ the fingers of both hands are equally long and slender]. 



The legs ai'e slender and the longest pair are not much more than 

 twice the length of the carapace. The last 3 joints of the last pair 

 form typical swimming paddles. 



An apparently adult specimen from the Persian Gulf and 3 j'ouug 

 from the Andamans are iu the Indian Museum. 



The carapace of the large specimen is 8 millim. long and 14 millim. 

 broad. 



9. Libystes Alphonsi, u. sp. 



Difiers from L. Edivardsi in the following particulars : — 



(1) the • carapace, though of the same proportions, is more quadri- 

 lateral and more convex foie and aft, and the eminences at the posterior 

 angles are wanting : 



(2) the antero-lateral borders of the carapace are smooth and 

 entire : 



(3) the front is more deflexed and more distinctly divided in the 

 middle line : 



(4) the chelipeds (in the young) nre about 2i times the length 

 of the carapace and are nearly equal and similar : the fingers are 

 hardly as long as the palm : 



(5) The last 3. joints of the last pair of legs are much broadened 

 and compressed, but arc not such uuniistakeablc paddles as those of 



. L. Edivardsi. 

 648 



