BORRADAILE— ON THE PONTONIIN^ 359 



11. PalcBmonella elegans Borradaile, 1915 (Plate 53, fig. 4). 

 Ann. Mag. Nat. Hist. (8), xv. p. 210. 



Definition : Closely related to P. tridentata but with rostrum quite different, 

 lanceolate, not reaching end of first joint of antennule, quite straight, of the formula ■§■, 

 two teeth standing behind the orbit. 



Length of the single specimen, 17 mm. 



Salomon. 



It is possible that this is an abnormal specimen of P. tridentata. 



12. PalcBmonella longirostris Borradaile, 1915 (Plate 53, fig. 5). 

 Ann. Mag. Nat. Hist. (8), xv. p. 210. 



Definition: Related to P. tridentata but differs in that: (l)'the rostrum is much 

 longer, outreaching the antennular stalk by not much less than half its own length, very 

 decidedly upcurved, and of the formula §, owing to the addition of a small tooth near 

 the tip ; (2) the third maxilliped is rather shorter, only reaching the end of the first 

 joint of the antennule ; (3) the wrist of the first leg is half as long again as the hand ; 

 (4) the second leg is longer and more slender, and has the arm of even width, not wider 

 in the middle as in P. tridentata, the spine at the end of the arm smaller, and smaller 

 teeth on the fingers. 



Length of longest specimen, 17 mm. 



Fadiffolu Atoll, Maldive Is. 



PalcBmonella gracilis Paulson, 1875 (Red Sea Crustacea, p. 117, PI. 17, fig. 6) does 

 not belong to this genus, and appears, from its telson, not to be a member of the 

 Pontoniinse. 



Genus Peeiclimenes Costa, 1844. 



Pelias, Roux, Mem. s. 1. Salicoques, p. 25 (1831). H. M.-Edwards, Hist. Nat. Crust, 

 ii. p. 381 (1837). Heller, Sitz. k. Ak. Wiss. Wien, xlv. p. 406 (1862); Crust, slidl. 

 Eur. p. 254 (1863). 



Periclimenes, Costa, Ann. Ac. Aspir. Nat. Napoli, ii. (1844) ; Faun. Reg. Napoli, li. i. 

 (1846). Borradaile, Ann. Mag. Nat. Hist. (7), ii. p. 380 (1898). Rathbun, Bull. U.S. 

 Fish Comm. xx. ii. p. 121 (1901). 



Anchistia, Dana, U. S. Explor. Exped. Rep. xiii. i. p. 577 (1852). Kingsley, Proc. Ac. 

 Philadelphia, 1879, p. 423 (1880). Carus, Prodr. Faun. Medit. i. p. 474 (1885). Ortmann, 

 Bronn's Thierreich, v. ii. p. 1131 (1899). 



Dennisia, Norman, Ann. Mag. Nat. Hist. (3), viii. p. 278 (1861). 



Definition : Body slender, usually somewhat compressed ; sixth abdominal segment 

 of moderate length ; rostrum of varying shape ; outer flagellum of antennule usually 

 not deeply cleft ; antennal scale of moderate breadth ; mandible without palp ; second 

 maxilliped without podobranch, though often with a vestige of it, last joint mediad of 

 preceding joint ; third maxilliped slender, with small arthrobranch ; legs slender, except 



