306 A. Alcock — Garcinological Fauna of India. [No. 3, 



8. Libystes Edivardsi, n. sp. 



Carapace, length about four-sevenths of the breadth, finely pitted 

 under lens, somewhat granular near the antero-lateral borders : an 

 angular eminence near either posterior angle and a slight concavity of 

 the postero-lateral part of the lateral epibranchial regions 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 carapace with 5 or 6 granular denticles 

 followed by a sharp procurved spine. 



The chelipeds have the bauds unequal in the adult. They are 

 more than three times the length of the carapace and are smooth 

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

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

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

 immobile finger of the smaller hand there are several irregular enlarged 

 teeth. [In the young, as in Catojptrits, the hands are nearly equal, and 

 the fingers of both hands are equally loug and slender]. 



The legs are 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 Persiau Gulf and 3 young 

 from the Andamans are in the Indian Museum. 



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

 broad. 



9. Libystes Alphonsi, n. sp. 



Differs from L. Edivardsi in the following particulars : — 



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

 lateral and more convex fore 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) are about 2\ 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 are not such unmistakeable paddles as those of 

 L. Edivardsi. 



