Referenees. 



Allman, G. J. 1878. Hydrozoa, in Nares's Narrative of a Voy- 



age to the Polar sea during 1875 — 76. in H. M. Ships 



"Alert" and "Discovery" 8vo. London. Yol. II, p. 290 



3 figg. (Ptychogastria polaris). 

 Beowne, E. T. 1895. Report on the Medusae of the Liverpool 



Marine Biological Committee District (Isle of Man). Trans» 



Liverpool Biol. Soc. 'Yol. IX, pp. 243—286. Reprinted in 



"Fauna of Liverpool Bay." Yol. IY. 

 Beowne, E. T. 1896. On British Medusae and Hydroids. Proc 



Zool. Soc London. 1896, pp. 459—500, Pis. XYI— XYIL 

 Beowne, E. T. 1898. On British Medusae. Proc. Zool. Soc 



London. 1897, pp. 816—835, Pis. XLVIII— XLIX. 

 Beowne, E. T. 1900. The Fauna and Flora of Yalencia Harbour, 



Ireland. Report on the Medusae. Proc Roy. Irish Acad. 



Ser. 3, Yol. Y. pp. 694—763. (Dublin). 

 Foebes, E. 1848. Monograph of the British Naked-Eyed Medusae. 



London. 

 Foeskål, P. 1775. Descriptiones Animalium. . quae in itinere 



orientali observavit. Hauniae. 

 Fowlee, G. H. 1899. Contributions to our Knowledge of the 



Plankton of the Faroe Channel. No. VIII. Medusae. Proc 



Zool. Soc. London. 1898, pp. 1016—1032. 

 Geønbeeg, G. 1898. Die Hydroid-Medusen des arktischen Ge- 



biets. Zool. Jahrb. Abth. Syst. Bd. XI. pp. 451—468. 



Taf. XXVII. 

 Haeckel, E. 1879—80. Das System der Medusen. Jena. 

 Haeckel, E. 1881. Die Tiefsee-Medusen der Challenger Reise 



und der Organismus der Medusen. Jena. 



