222 



GEOGRAPHICAL DISTRIBUTION. 



teras, presents features of its own ; the coast of the Carohnas and 

 Georg-ia has likewise distinct faunal features, while Florida and the 

 West Indies have each their peculiar Acalephs, though the boundaries 

 of the distribution of many of the species, found in each of those divis- 

 ions, extend far beyond tlie limits we have here assigned to the regions. 

 On the Pacific side of North America, we find the great belt of the 

 Northern Pacific extending from the shores of Kamtschatka to British 

 North America ; the inland sea behind Vancouver's Island and the main- 

 land has a characteristic fauna, and along the coast of California itself 

 still different Medusae are found. The association of the three elements 

 mentioned above being so different at certain localities, we naturally 

 come to look upon them as centres from which the species of a fauna 

 are derived, while in reality it is only the peculiar combinations of the 

 geographical extension of each species which give the distinguishing 

 features to each locaHty. 



NORTH PACIFIC. 



SITKA, ALEUTIAN ISLAOT)S, BEHRING S STRAITS, KAMTSCHATKA. 



Bolina septentrionalis Mert. 

 Janira cucumis Less. 

 Dnjodora glandiformis Ag. 

 Phacellophora camtschatica Br. 

 Cyanea Postelsii Br. 

 Cyanea ferruginea Escli. 

 Pelagia Brandtii Ag. 

 Polybostricha helvola Br. 

 Melanasler Mertensii Ag. 

 jEginopsis Laurentii Br. 

 Trachynema camtschaticum A. Ag. 

 Stauropkora Mertensii Br. 

 Diphasia (n/^ra-like) 

 Sertularia (aftje^ina-like) 

 Colulina Greenei A. Ag. 

 Thuiaria {thuja-]ike) 

 Bougainvillia Mertensii Ag. 

 Proboscidactyla Jiavicirrata Br. 



GULF 



Bolina microptera A. Ag. 

 Pleurohrachia Bachei A. Ag. 

 Idyia cyathina A. Ag. 

 Hecccedecomma ambiguum Br. 

 Cyanea Postelsii Br. 

 Trachynema camtschaticum A. Ag. 

 Oceania gregaria A. Ag. 

 Crematostoma Jlava A. Ag. 

 Zygodactyla ccerulescens Br. 

 jEquorea ciliata Esch. 

 Laomedea pacifica A. Ag. 



