362 .PERCY SLADEN TRUST EXPEDITION 



yS. No supraorbital spine. 



(1) R. =-|. Hepatic spine present. Antennal scale bears distal spine 



at end. 



P. (C.) notatus (Heller), 1865. 



(2) R. = 1^. Hepatic spine absent. Antennal scale bears distal 



spine at a little distance from end. 

 P. (C.) pusillus Rathbun, 1903. 



ii. Ventral edge of rostrum bears one tooth. 



a. Rostrum ^^ ; longer than antennular stalk ; its tip not upturned. 

 Angles of arm and wrist sharp. 



P. (C.) gracilis (Dana), 1852. 



/3. Rostrum j^ ; shorter than antennular stalk ; its tip a little up- 

 turned. Angles of arm and wrist not sharp. 

 P. (C.) potina Nobih, 1905. 



2. Rostrum not lanceolate, with decided reversal of curve at tip. 



a. Rostrum |- ; outreaching antennular stalk. Hepatic spine present. 

 Hand of second leg elongate. 



i. A denticle on carapace behind rostral crest. Last joint of third 

 maxilliped slightly shorter than penultimate. 

 P. (C.) incertus Borradaile, 1915. 



ii. No denticle on carapace behind rostral crest. Last joint of third 

 maxilliped slightly longer than penultimate. 

 P. (C.) parvus Borradaile, 1898. 



h. Rostrum -J ; outreached by antennular stalk. No hepatic spine. Hand 

 of second leg short. 



P. (C) parasiticus Borradaile, 1898. 



' 1. (Type.) PericUmenes (Cristiger) scriptus (Risso), 1826. 



Alpheus scriptus, Risso, Hist. Nat. Eur. Mer. v. p. 78 (1826); Acad. Leop., 1826, 

 p. 821. 



Pelias scriptus, Roux, Mem. s. 1. Salicoques, p. 25 (1831). Heller, Sitz. k. Ak. Wiss. 

 Wien, Math. -Nat. CI. xlv. p. 406, PL 2, fig. 34 (1862). 



PericUmenes insignis, Costa, Ann. Ac. Aspir. Nat. Napoli, ii. (1844) ; Faun. Regn. 

 Napoh, ii. i. PL 6, figs. 1—6 (1846). 



Dennisia sagittifera, Norman, Ann. Mag. Nat. Hist. (3), viii. p. 278, PL 13, figs. 8 — 13 

 (1861). 



Anchistia scripta, Heller, Crust, siidl. Eur. p. 256, PL 8, figs. 18, 19 (1863). Carus, 

 Prodr. Faun. Medit. i. p. 476 (1885). 



PericUmenes scriptus, Borradaile, Ann. Mag. Nat. Hist. (7), ii. p. 381 (1898). 



Mediterranean, Guernsey. To 30 fms. 



