BORRADAILE— ON THE PONTONIIN^ 357 



Wrist of first leg shorter than hand. Dactylopodites of last three legs 

 bear a spine in the middle of the lower edge. (R. = f.) 

 P. hatei n. nom. 



A hepatic spine present. 



, Last three legs biunguiculate. Second wrist more than \ length of hand, 

 a. Second legs unequal. R. = | . 



P. hiunguiculata Nobili, 1904. 



h. Second legs subequal. R. = ^. 



P. rathhunensis n. nom. 



2. Last three legs not biunguiculate. Second wrist less than ^ length of 

 hand. 

 a. Rostrum deep, lanceolate. Palm of second leg only as long as fingers. 

 {R.=^«.) 



P. amboinensis Zehnter, 1894. 



h. Rostrum shallow, not lanceolate, slightly upcurved. Palm of second 

 leg twice as long as fingers. 

 i. R. = I , lower tooth removed from tip. 

 P. ajfinis Zehnter, 1894. 



ii. R. = ^~ , lower teeth near tip. 



P. laccadivensis Alcock and Anderson, 1894. 



II. Second leg bears a spine at least on wrist, which is more than half length 

 of hand. 



A. Arm of second leg bears a spine at end. Indopacific. 



1. Rostrum |, much shorter than antennal stalk. 



P. elegans Borradaile, 1915. 



2. Rostrum |Ef, longer than antennal stalk. 



a. Spine at end of arm of second leg subterminal. Fingers of same leg 

 toothed. Teeth on lower side of rostrum well spaced, 

 i. Rostrum outreaches antennular stalk by nearly half its own length, 

 decidedly upcurved. Wrist of first leg half as long again as hand. 

 P. longirostris Borradaile, 1915. 



ii. Rostrum but little outreaches antennular stalk, hardly upcurved. 

 Wrist of first leg less than half as long again as hand. 

 P. tridentata Borradaile, 1899. 



h. Spine at end of arm of second leg terminal. Fingers of same leg not 

 toothed. Teeth on lower side of rostrum stand close together near tip. 

 P. tenuipes Dana, 1852. 



B. Arm of second leg bears no spine. West Indian. (R. =|.) 



P. yucatanica Ives, 1891. 



