366 PERCY SLADEN TRUST EXPEDITION 



well expanded, with moderate stylocerite and distal spine, second and third joints stout 

 and subequal ; antennal scale of moderate breadth, almost straight-sided, its end truncate 

 and not reached by its distal spine ; third maxilliped slightly outreaching antennal stalk, 

 but not reaching end of first joint of antennular stalk ; first leg outreaching antennal 

 scale by hand, its wrist and arm equal, hand shorter than wrist, palm and fingers sub- 

 equal ; last three legs stout, their propodites hairy and armed with spines, their dactylo- 

 podites gently curved and ending in a sharp claw ; telson shorter than uropods, 

 diminishing rather suddenly near the end, which is rounded and has all the spines 

 short. 



Length of the single specimen 12 mm. 



Mal^ Atoll, Maldive Is., on red and brown crinoid. 



3. PericUmenes (Corniger) amboinensis (de Man), 1887. 



Anchistia amboinensis, de Man, Arch. Naturg. liii. i. p. 546, PL 22 a, fig. 2 (1887). 

 PericUmenes amboinensis, Borradaile, Ann. Mag. Nat. Hist. (7), ii. p. 383 (1898). 

 Amboina. 



Subgenus Falciger Borradaile, 1915. 



Ann. Mag. Nat. Hist. (8), xv. p. 207. 



Defiyiition : Rostrum toothed, with straight or concave upper edge, nearly always 

 upcurved at tip, long or of medium length. Antennal, usually hepatic, and often supra- 

 orbital spines present. Second leg usually with wrist long or of moderate length, usually 

 with spine at end of wrist or arm or both. 



Key to the species of PericUmenes [Falciger). 



I. Fingers of great chela each with an oval pit ; those of first legs with comb-like 

 arrangement of fine teeth. [B. = 3r:5-] 



A. Supraorbital spine present. 



P. [F.) spiniferus de Man, 1902. 



B. Supraorbital spine absent. 



P. (F.) petitthouarsi (Audouin), 1825. 



II. Fingers of great chela, and usually also those of first legs, not as in I. 

 A. Supraorbital spine present. 



1. Rostrum without teeth below. [R-=-§-] 



P. (F.) Ufuensis Borradaile, 1898. 



2. Rostrum with teeth below. 



a. Second leg unarmed. Antennal scale broad; with distal spine not 

 projecting beyond end. 



i. Antennular stalk reaches end of rostrum. Teeth above rostrum show 

 a gap in middle of series. [R = f.] 



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



