igi6.] vS. Kemp : Notes on Crustacea Decapoda. 357 



1. Lateral margins of rostrum anteriorly divergent, 



apex broad, squarely truncate [carapace with 

 one mid-dorsal spine in male onl}' ; two pairs 

 of lateral spines in both sexes]... ... candid us, s\i. now 



2. Lateral margins of rostrum anteriorly conver- 



gent, apex narrow, rounded or pointed. 



a. Rostrum of good size, separating the eyes ; 



carapace with one or more teeth in median 

 line ; dactylus of second peraeopods nol 

 narrower than fixed finger, 

 i. Carapace pubescent with three teeth in mid- 

 dorsal line [four pairs of lateral teeth on 

 carapace ; lateral process of antennular 

 peduncle anteriorly spinose] .. ... [^ilosiis, s\>. nov. 



ii. Carapace not pubescent with only a single 

 tooth in mid-dorsal line. 

 a. Three pairs of lateral teeth on carapace ; 

 lateral process of antennular peduncle 

 anteriorly pointed; "thumb" of sub- 

 chela formed of a single articulated 

 tooth ... .. ... plebs, sp. nov. 



18. No lateral teeth on carapace ; lateral pro- 

 cess of antennular peduncle anteriorly- 

 truncate; "thumb " of subchela formed 

 of two teeth, closely juxtaposed and not 

 articulated ... ... ... Iwiidersoiii. Kemp. 



b. Rostrum exceedingly small, eyes contiguous ; 



carapace without teeth in median line ; 

 dactylus of second peraeopods very slende*- 

 less "than half the breadth of fixed finger ... f^nrvirosfyis.%\~>. now 



Pontophilus gracilis^ Smith. 



1901. Pontopliilits gracilis, Alcock, Cat. India)i deep-sea Crust. Macrura 



and Anomala, p. 115. 

 1005. Pontophilus gracilis, Stebbing, Marine Invest. S. Africa, IV, ]). 49, 



pi. XXV. 



Pontophilus abyssi, Smith. 



i<)Oi. Pontophilus abvssi, Alcock. Cat. Indian deep-sea Crust. Macrura and 

 Anomala, p. 1 16. 



Pontophilus incisus, sp. iiov. 

 (Plate viii, fig. i.) 



The rostrum is longitudinally channelled ; its sides are almost 

 parallel and its distal border, in dorsal view, is strongly concave. 

 The ac'-ual apex is rounded, but is abruptly deflexed at a right 

 angle a^id can therefore be seen only from in front. The sides of 

 the rostrum and the orbital margins are clothed with long hairs 

 which partially conceal the eyes. 



On the carapace a shallow groove extends transversely across the 

 base of the rostrum. In the mid-dorsal line there is a rather obscure 

 interrupted carina composed of four short ridges. The first of these 

 ridges ends anteriorly in a conspicuous tooth just behmd the trans- 

 verse groove mentioned above; the second, which is very feebly 

 developed, usually terminates in a minute denticle ; the third is 



