LIST OF PLATES. 



Tln> 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: /?. rostrum; Urs. urosome with the caudal rami : 

 Ut'ii. S. genital segment of female: 0. eye; a. 1 anterior antenna: a. 2 posterior antenna: or. area 

 oral area; L. anterior lip; M. mandible; HI. maxilla; mp. 1 anterior maxilliped; mp. 2 posterior maxil- 

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



PI. I. 



Calanus finmarehieus (Gunner), female. 



PL II. 



Calanus finmarehieus; female. (Continued). 



PL III. 



Calanus finmarehieus, adult male. 



PL IV. 



CalanilS helgolandieilS (Clans): female & male. 



PL V. 

 Calanus hyperboreus, Kroyer: female & male. 



PL VI. 



Rhinealanus nasutllS, Giesbrecht: female. 



PL VII. 



RhincalanUS nasutllS; female (continued). 



PL vin. 



Paracalanus parvus (Claus); female. 



PL IX. 



Paracalanus parYUS; male anil female (con- 

 tinued). 



PL X. 



Pseudoealanus elongatus, Boeck; female. 



PL XI. 



Pseudoealanus elongatus, male & female (con- 

 tinued). 



PL XII. 



SpinOCalanus abyssalis, Giesbrecht: female. 

 (See Suppl.. p. 157.) 



PL XIII. 



armatus, Boeck, female 



male. 



PL XIV. 



armatUS; male & female (continued). 



PL XV. 



ChiridillS armatUS (Boeck): female 



male. 



PL XVI. 

 ChiridlUS armatUS; female \ male (continued). 



PL XVII. 



ChiridiuS Obtusifrons, G. 0. Sars: female & 

 male. 



PL XVIII. 



Ga'idiuS tenuispinUS, G. O. Sars: female. (See 

 Suppl., p. 1H-J.) 



PL XIX. 

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



PL XX. 



Undinopsis Bradyi; female (continued). 



PL XXI. 



Undinopsis similis, G. O. Sars: female & male. 



