BORRADAILE— ON THE PONTONIIN^ 367 



ii. Antennular stalk does not reach end of rostrum. Teeth above rostrum 

 show no gap in middle of series. [R,.=^.] 

 P. (F.) nilandensis Borradaile, 1915. 



Second leg bears one or more spines. Antennal scale narrow ; with 

 distal spine projecting beyond end. 



i. Upper edge of rostrum straight at first, upcurved at end. 



a. Rostrum shallow, little excavated at base, not reaching end of 

 antennular stalk. Second wrist bears one spine. 



(1) Antennal scale broad. Second wrist more than half length of 



hand. [R.=^.] 



P. (F.) dance (Stimpson), 1860. 



(2) Antennal scale narrow. Second wrist about one-third length 



of hand. [R = f .] 

 P. (F.) grandis (Stimpson), 1860. 



y8. Rostrum deep, much excavate at base. Second wrist bears two or 

 three spines. 



(1) Outer edge of antepenultimate joint of third maxilliped bears 



one spine. Wrist of second leg has no spine on the inner 

 side. Fingers of same leg toothless. [R. =|.] 

 P. (F.) elegans (Paulson), 1875. 



(2) Outer edge of antepenultimate joint of third maxilliped bears 



several spines. Wrist of second leg has strong spine on inner 

 side. Fingers of same leg toothed. 



{a) R. = -I ; its tip simple. In second leg fingers about one-third 

 length of palm, and wrist nearly twice length of fingers. 

 P. (F.) affinis Borradaile, 1915. 



(b) R.=f ; its tip bifid. In second leg fingers, rather more than 

 half length of palm, and wrist equal in length to fingers. 

 P. (F.) dubius Borradaile, 1915. 



ii. Upper edge of rostrum concave from base. 



a. nostrum deep. Second wrist about as long as arm. 



(1) Antennule has flagella shorter than stalk and third joint longer 

 than second. Not more than one spine at end of second wrist. 



(a) Second wrist without spine ; a little longer than arm. [R = |5|.] 

 P. (F.) ensifrons (Dana), 1852. 



(/3) Second wrist bears a spine; a little shorter than arm. [R = |^.] 

 P. (F.) vitiensis Borradaile, 1898. 



