1922.] S. Kemp: Notes on Crustacea Decapoda. 167 



will have to be abandoned. It will not be possible to distinguish 

 the subgenus in a satisfactory manner by the form of the second 

 peraeopods, as these limbs exhibit a very wide range of variation 

 in Periclimenes s.s. 



Borradaile in proposing Hamiger, a new subgenus of Peri- 

 climenes s for his P. novae-zealandiae , seems to have overlooked the 

 fact that the species is closely related to the members of his Peri- 

 climenaeus. P. novae-zealandiae differs from the two species re- 

 ferred to the latter genus only in minor details of rostrum and 

 chela which are clearly no more than specific. 



Key to the species of the subgenus Periclimenaeus. 



No teeth on lower border of rostrum ; inner edges of fin- 

 gers of larger chela provided with a knob fitting into a 

 socket. 

 Two posterior teeth of upper rostral series situated on 



carapace; larger chela with knob on dactylus and 



socket on fixed finger ; fringes of setae on legs not 



remarkably long ; R 9:0 ... ... ... robustus^ Borradaile). 



No teeth of upper rostral series situated on carapace ; 



larger chela with knob on fixed finger and socket 



on dactylus ; fringes of setae on legs remarkably 



long; R. 4-7:0... ... ... ... fimbriatus (Borradaile). 



Two teeth on lower border of rostrum ; larger chela 

 with a huge bifid tooth at base, overlapping dactylus ; ; 



R. 8 : 2 ... .. ... ... novae-zealandiae (Bor- 



radaile). 



Periclimenes (Periclimenaeus) robustus (Borradaile). 



1915. Periclimenaeus robustus, Borradaile, Ann, Mag. Nat. Hist. (8) 



XV._p.ai3. 

 1 91 7 . Periclimenaeus robustus, Borradaile, Trans. Linn. Soc. (2) Zool. 



XVII, p. 378, pi. lv, fig. 20. 



Amirante I., 29-39 fms. 

 Periclimenes (Periclimenaeus) fimbriatus (Borradaile). 



1915. Periclimenaeus fimbriatus, Borradaile, Ann. Mag. Nat. Hist. (8) 



XV, p. 213. 

 191 7. Periclimenaeus fimbriatus, Borradaile, Trans. Linn. Soc. (2) 

 Zool. XVII, p. 379. pi. Iv, fig. 19. 



Mulaku Atoll, Maldives. Providence I., 39-50 fms. 

 Periclimenes (Periclimenaeus) novae-zealandiae (Borradaile). 



1916. Periclimenes (Hamiger) novae-zealandiae, Borradaile, Brit. 



Antarct. Exped. 1910, Zool. Ill, p. 87, text-fig. 4. 



7 mi. E. of N. Cape, New Zealand, 70 fms. 



Subgenus Ancylocaris Schenkel. 



I include under this subgeneric name all those species of Peri- 

 climenes in which the dactylus of the last three legs is simple, with- 

 out the additional claw or process found in Periclimenes s.s. and 

 in Periclimenaeus. 



