1899.] A. Alcock — Carcinological Fauna of India. 69 



In both sexes the 2nd and 3rd abdominal terga are carinate — the 

 2nd strongly and sharply so. The 6fch tergum of the male is truncate- 

 triangular, the sides being very slightly sinuous. 



In life the dorsal surface of the carapace is terra-cotta red and 

 there is a good-sized crimson spot towards the inner side of the middle 

 of either branchial region : the exposed dorsal surface of the chelipeds 

 is reddish with numerous darker red markings. 



In the Indian Museum there are 6 specimens, including an egg- 

 laden female, from the Gulf of Martaban 53-67 fathoms. 



In the male the carapace is about 27 millim. long and about 39 

 millim. in extreme breadth : in the female it is a good deal smaller. 



43. Charyhdis {Gonioneptunus) bimaculata, Miers. 



Goniosoma variegatum var. bimaculatum, Miers, Challenger Brachyura, p. 191, 

 pi. XV. fig. 3. 



'As in (7. truncata the lobule at the outer angle of the basal 

 antenna-joint does not touch the front, so that the antennal flagellura 

 stands in the orbital hiatus. 



Length of carapace more than f but less than | the breadth. 



Carapace flattish, covered with dense short tomentum, crossed 

 transversely by salient granular ridges arranged exactly as in (7. ornata. 



Front almost similar to that of G. ornata, except that, as in 

 0. truncata, the outer pair of teeth on either side are sub-confluent 

 and form a sort of reduplicated inner supra-orbital angle. 



Antero-lateral borders exactly as in G. truncata, except that the 

 last (spine-like) tooth is at least half again as long as atiy of those in 

 front of it. 



Posterior border of dorsal surface of carapace exactly as in G. trun- 

 cata. 



Eyes and orbits as in G. ornata. 



Chelipeds about 2| times the length of the carapace. The lower 

 border and the distal half of the upper surface of the arm are granular : 

 there are 2 or 3 spines on the anterior border of this joint, and the 

 posterior border ends in a spine. Upper surface of wrist granular, the 

 inner angle of this joint strongly dentiform, and there are 2 or 3 spin- 

 ules on the outer angle. Hand in the adult inflated and, except that the 

 squamiforra markings of the under surface are almost obliterated, exactly 

 similar to that of G. truncata. 



Abdomen as in G. truncata. 



Except that the merus is only about | as long as broad, the last 

 pair of legs are as in G. truncata. 



In the Indian Museum are 2 small specimens, from Palk Straits 



