LITTORAL LISTS. 



The accompanying Lists will show how far the Geographical Districts 

 which have been recognized are natural. The lists are not culled to show 

 the characteristic species of each district ; on the contrary, all the species 

 occurring within a given range of coast are included ; and as the range of 

 each species in the district is always given, it will be an easy matter, by a 

 comparison of the map and of the lists, to see how far each species contrib- 

 utes to the districts recognized. 



OKHOTSK SEA TO GULF OF GEORGIA. 



Slrongylocentrotus Drfibachiensis A Ac. ass. Okhotsk Sea; Gulf of Georgia. 

 Strongylocenlrotus intermedins A. Agass. Seghalion. 

 EcMnarachnius excentricus Val. Karatchatka ; San Diego. 

 Echinarachnius parma Gray. Kamchatka ; Aleutian Islands. 



GULF OF GEORGIA TO SOUTHERN PERU. 



Cidaris Thouarsii Val. Peru ; Cape St. Lucas. 



Diadema mexicanum A. Agass. Panama ; Cape St. Lucas. 



Astropyga pulvinafa Agass. Panama ; Gulf of California. 



CentTostephanus coronatus A. Agass. Cape St. Lucas. 



Arbacia nigra A. Agass. Peru. 



Arbacia spattdigera A. Agass. Peru. 



Arbacia stellata Gray. Peru ; Santa Barbara. 



Colobocentrotus atratus Br. Peru. ? 



Echinnmetra Van Brunti A. Agass. Peru ; Cape St. Lucas. 



Strongylocenlrotus Drdbachiensis A. Agass. Gulf of Georgia. 



Strong ylocentrotus franc iscanus A. Agass. San Diego; Gulf of Georgia. 



Slrongylocentrotus eurythrogrammus A. Agass. Galapagos. 



Slrongylocentrotus mexicanus A. Agass. Panama; Gulf of California. 



Strongylocenlrotus purpuratus A. Agass. San Francisco; Gulf of Georgia. 



Slrongylocentrotus gibbosus A. Agass. Peru ; Galapagos. 



Pleurechinus bothryoides Agass. Galapagos. 



Toxnpneustes semituberculatus Agass. Panama; Galapagos; Cape St. Lucas. 



Toxopneustes pileolus Agass. Panama; Gulf of California. 



Hipponoe depressa A. Agass. Panama ; Gulf of California. 



Amblypneustes formosus Val. Galapagos.? 



Ecliinanthus testudinarius Gray". Gulf of California. 



Clypeaster rotundus A. Agass. Panama ; San Diego. 



Echinarachnius excentricus Val. San Diego; Gulf of Georgia. 



