DISTRIBUTION. 



255 



Genera 



Number 



Number of Pacific species 



Percentage of tlie total num- 

 ber of known species 



Caminella 



2 



1 



50 



Pachymatisma 



5 



0 



0 



Caminus 



4 



1 



25 



Isops 



17 



4 



23.5 



Sidonops 



20 



9 



45 



Geodia 



44 



29 



65.8 



Geodinella 



2 



2 



100 





94 



46 



49 



Within the Pacific region the following eleven areas can be distinguished, 

 in no two of which the same species has been found. 



Sidonops californica. 

 " angulata 



var. megana 

 " microana 

 " orthotriaena 

 " bicolor 

 Geodia me.sotriaena 



var. pachana 

 " megana 

 " microana 

 agassizii 

 mesotriaenella 

 breviana 

 ovis 



acanthtylastra 

 Geodinella robusta 



var. earolae 

 " megaclada 

 " megasterra 



Sidonops reticulata 

 Geodia ataxastra 



var. angu.stana 

 " latana 

 " media. 



West coast of North America. 

 22° 1.5' N. 



Southern California. 



from .33° 18' N. to Monterey Bay, Cal. 

 from 33° 38' 45" N. to 34° 22' N. 



from 33° 50' 45" N. to Naha Bay, Behm Canal, S. E. Alaska. 

 Santa Barbara Island. 



Southern California and near Comox, Strait of Georgia. 

 34° 1' 30" N. 

 22° 52' N. 



Southern California, Queen Charlotte Sound, and Naha Bay, Behm 

 Canal, S. E. Alaska. 



West coast of Central America. 



Mexico (? which coast). 

 Perico Island, Gulf of Panama. 



Gulf of Panama and Mexico (? which coast). 



Eastern Pacific Isla?uls. 



Sidonops oxyastra 

 Geodia cooksoni 

 " micropora 



Duncan Island, Galapagos. 

 Charles Island, Galapagos. 

 Duncan Island, Galapagos. 



