222 



GEOGRAPHICAL DISTRIBUTION. 



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

 Georgia has likewise distinct faunal features, while Florida and the 



o 



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 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 locality. 



NORTH PACIFIC. 



* 



SITKA, ALEUTIAN ISLANDS, BEHRING'S STRAITS, KAMTSCHATKA. 



Bolina scptcntrionalis Mert. 

 Janira cucumis Less. 

 Dryodora glandiformis Ag. 

 Phaccllophora camtschatica Br. 

 Cyanea Postelsii Br. 

 ( '//mica ferruginea Esch. 

 Pelagia Brandtii Ag. 

 Polybostricha helvola Br. 

 Melanaster Mertensii Ag. 

 ^Eginopsis Laurentii Br. 

 Trachynema camtschaticum A. Ag. 

 Staurophora Mertensii Br. 

 Diphasia (H /r/ra-like) 

 Sertularia (a&iema-like) 

 Cotulina Greenei A. Ag. 

 Tli niaria (th /a-like ) 

 Bougainvillia Mertensii Ag. 

 Proloscidactyla flavidrrata Br. 



Behring's Straits. 

 Sitka. 



Behring's Straits. 

 Kamtschatka. 

 Sitka. 



Aleutian Islands ; 

 Aleutian Islands. 

 Aleutian Islands. 

 Kamtschatka. 

 Behring's Straits. 

 Kamtschatka. 

 Aleutian Islands. 

 Behring's Straits. 

 Behring's Straits. 

 Behring's Straits. 

 Behring's Straits. 

 Behring's Straits 

 Kamtschatka. 



Kamtschatka. 



Mertens. 



Mortens. 



Mertens. 



Mertens. 



Mertens. 



Eschscholtz. 



Mertens. 



Mertens. 



Mertens. 



Mertens. 



Mertens. 



Mertens. 



W. Stimpson. 



W. Stimpson. 



W. Stimpson. 



W. Stimpson. 



Mertens. 



Mertens. 



GULF OF GEORGIA, W. T. 



microptera A. Ag. 

 Pleuroibrachia Bacliei A. Ag. 

 Idyia cyatJnna A. Ag. 

 Hecccedeconima amliiguitm Br. 

 Cyanea Postelsii Br. 

 Trachynema camtschaticum A. Ag. 

 Oceania gregaria A. Ag. 

 Crematostoma flava A. Ag. 

 la ccerulescens Br. 

 ciliata Eseh. 

 Laomedea pacifica A. Ag. 



A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 



Polyorcliis penicillata A. Ag. 

 Laodicea eellularia A. Ag. 

 Gonionemus vertens A. Ag. 

 Melicertum georgicum A. Ag. 

 Bougainvillia Mertensii Ag. 

 Stomotoca atra A. Ag. 

 Proboscidactyla flavicirrata Br. 

 Coryne rosaria A. Ag. 



Velella septentrionalis Esch. 

 Porpita sp. 



A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 

 A. Agassiz. 



