298 Froceedings of the Royal Physical Society. 



be confined to the arctic or subarctic seas. There seems to 

 be little doubt that Cetochilus septentrionalis is identical with 

 Calanus helgolandicus, Glaus, and having priority in publica- 

 tion, it should have preference over G. helgolandicus. 



Family P arac al anid^, G. 0. Sars, 1902. 

 Genus (2) Paracalanus, Boeck, 1864. 



2. Paracalanus parvus (Glaus). 



1863. Calanus parvus, Glaus, Die frei-lebenden Copepoden, p. 173, 



pi. xxvi. figs, 10-14; pi. xxvii. tigs. 1-4. 



Hal. — Occasionally taken with the tow-net near the sea- 

 ward limits of the Forth estuary, sometimes in moderate 

 abundance, but usually it is a rather scarce species. 



Family P s eudo c al anid^. 

 Genus (3) Pseudocalanus, Boeck, 1872. 



3. Pseudocalanus elongatus, Boeck. 



1864. Glausia elongata, Boeck, Forliandl. Videnskabs-Selskabet, 



Chris tiania (1864), p. 9. 



Hah. — Gommon throughout the estuary. Boeck described 

 this species as Glausia elongata, but as that generic name had 

 been previously used by Glaparede for a genus of parasitic 

 Gopepods, he withdrew it and substituted the name Pseudo- 

 calanus. 



Family ^tideid^.. 

 Genus (4) Brady idius, Giesbrecht, 1897. 



4. Bradyidius armatus (G. S. Brady). 



1878. Pseudocalanus armatus, G. S. Brady, Monogr. Brit. Gopep., 

 vol. i. p. 46, pi. iv. figs. 1-11. 



1897. Bradyidius armahis, Giesbrecht, Zool. Anzeiger, No. 536. 



1898. ,, ,, T. Scott, Sixteenth F. B. Kept., pt. iii. 



p. 264, pi. xii. figs. 1-19. 

 1902. Undinopsis Bradyi, G. 0. Sars, Crustacea of Norway, vol. iv. 

 p. 32, pis. xix., XX. 



Hal). — Off St Monans and a few other places near the 



