174 A. Alcock — Carcinological Fauna of India. [No. 2, 



Rostrum short, emai^ginate, distinctly delimited from the carapace. 

 Epistome short. 



Exteimal maxillipeds with the merus narrower than the ischium, 

 and bearing the flagellum at the antero-internal angle. 



Legs not elongate : dactyli slender, straight. 



Paratymolus hastatus, n. sp. Plate V. figs. 4, 4a. 



Carapace somewhat elongate-pentagonal or ovoid, with the ros- 

 trum sharply demarcated, and with the regions undefined. 



Gastric region with three sharp tubercles disposed in a triangle, 

 base forwards : cardiac region with a single tubercle: branchial regions 

 each surmounted by an oblique crest of 2 or 3, and with a lateral mar- 

 ginal row of 2 or 3, sharp tubercles : hepatic regions each with two 

 sharp lateral teeth, the posterior of which is large. Rostrum short, 

 emar^inate, deeply and broadly grooved dorsally. 



Eye-stalks long, laterally projecting, slightly moveable forwards 

 but not retractile. Eyes tipped with two or three stiff setaa. No 

 orbits, and nothing in the shape of orbital spines except a slight 

 angular emargination of the base of the rostrum. 



Antenna) as long as the post-orbital portion of the carapace, and 

 visible, dorsally, from the base of the second joint of the peduncle : 

 the basal joint, which alone is concealed, although slender is short, 

 hardly reaching the front. 



External maxillipeds with the merus broad, but not so broad as the 

 ischium, and giving insertion to the palp at the antero-internal angle. 



Trunk-legs with a few coarse stiff setae : the 2nd pair, which are 

 slightly the longest, are a little less than twice the length of the 

 carapace without the rostrum. 



Chelipeds characterized by the carpus, which has its antero-internal 

 angle produced obliquely to form a great spike, the point of which 

 reaches almost to the base of the fingers. 



Length of carapace 6 millim. Breadth of carapace 4'5 millim. 

 Length of 2nd pair of legs 10'5 millim. 



An egg-laden female from the Andamans ; in which I am satisfied 

 that the genital orifices are not on the bases of the third pair of legs, but 

 on the sternum. 



PHYSACHiEus, n. gen. 



Closely allied to Ach&us, from which it is distinguished chiefly by 

 the form of the basal joint of the antennary peduncle, which is long 

 and slender, and is fused near its distal end with the tip of the rostrum. 



