222 



GEOGRAPHICAL. DISTRIBUTION. 



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

 Georgia has Hkewise distinct fauna! 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 the 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 Medusse 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 famia 

 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 locaUty. 



GULP OF GEORGIA, W. T. 



Bolina microptera A. Ag. A. Agassiz. 



Pleurobrachia Bacliei A. Ag. A. Agassiz. 



Idyia cyathina A. Ag. A. Agassiz. 



Heccosdecomma ambignum Br. A. Agassiz. 



Cyanea Postelsii Br. A. Agassiz. 

 Trachynema camtschaticum A. Ag. A. Agassiz. 



Oceania gregaria A. Ag. A. Agassiz. 



Crematostoma flava A. Ag. A. Agassiz. 



Zygodactyla ccerulescens Br. A. Agassiz. 



^rjuorea ciliata Esch. A. Agassiz. 



Laomedea pacijica A. Ag. A. Agassiz. 



Polyorchis penicillata A. Ag. A. Agassiz. 



Laodicea cellularia A. Ag. A. Agassiz. 



Gonionemus vertens A. Ag. A. Agassiz. 



Melicertum, georgicum A. Ag. A. Agassiz. 



Bougainvillia Mertensii Ag. A. Agassiz. 



Stomotoca atra A. Ag. A. Agassiz. 



Proboscidactyla flavicirrata Br. A. Agassiz. 



Coryne rosaria A. Ag. A. Agassiz. 



Physalia sp. A. Agassiz. 



Velella septentrionalis Esch. A. Agassiz. 



Porpita sp. A. Agassiz. 



