LIST OF PLATES. 



The Plates have been marked as far as possible in accordance with those belonging 

 to the 3 previous Volumes (Amphipoda, Isopoda, Cumacea). 



The following- are the chief signs, with their significance: 



9 female; cf male; C. cephalosome: R. rostrum: Urs. nrosome with the caudal rami ; 

 gen. S. genital segment of female; 0. eye: a. 1 anterior antenna; n.- posterior antenna; or. area 

 oral area; L. anterior lip; M. mandible: m. maxilla: ip. 1 anterior maxilliped : nip. 2 posterior mnxil- 

 liped ; p} p. 5 legs of 1st to 5th pairs. 



PI. I. 



CalanilS finmarehicus (Gunner), female. 



PI. II. 



Calanus fmmarehieus; female, (continued). 



PI. in. 



Calanus fmmarehieus, adult male. 



PI. IV. 

 Calanus helg-olandieus (Clau-0: female & male. 



PL V. 

 Calanus hyperboreus, Kroyer; female & male. 



PI. VI. 



Rhinealanus nasutllS, Giesbrecht; female. 



PI. VII. 

 Rhinealanus nasutllS; female (continued). 



PI. VIII. 



Paraealanus parvus (Clans): female. 



PL IX. 



Paraealanus parVUS; male and female (con- 

 tinued). 



PL X. 



Pseudoealanus elongatus, Boeck : female. 



PL XL 



Pseudoealanus elongatus, male & female (con- 

 tinued). 



PL XII. 



Spinoealanus abyssalis, Giesinvrht : female. 

 (See Suppl., p. 157.) 



PL XIII. 

 /EtldeilS armatus, Boeck, female & male. 



PL XIV. 



^tideus armatus; male & female (continued). 



PL XV. 



ChiridlUS armatus (Boeck): female & male. 



PL XVI. 



Chiridius armatus; female & male (continued). 



PL XVII. 



Chiridius obtlisifrons, G. 0. Sars: female & 

 male. 



PL XVIII. 



Ga'idius teiiuispinus, G-. O. Sars : female. (See 

 Suppl., p. 1H2.) 



PL XIX. 



Undinopsis Bradyi, G. 0. Sars: female & male. 



PL XX. 



Undinopsis Bradyi; female (continued). 



PL XXI. 



Undinopsis Similis, G. 0. Sars; female&male. 



