THE NAUTILUS. 47 



dita. It ha8 been reported as growing on Gebia pugetensie, a bur- 

 rowing crustacean, but so far as I know, no report has been made of 

 this habitat. About a quarter of the specimens taken had one or 

 more of the mollusks attached. 



Lepton mcrdeum Cpr. Orcas Island. 



Kellia laperousii Desh. Orcas Island, EUamar. 



Kellia suborbicularis Montagu. Eliaraar. 



Rochefortia aleutica Dall. Port Graham. 



Rochefortia tumida Cpr, Ballard Beach. 



Turtonia minuta Mont. EUamar, Port Graham. 



Astarte alaskensis Dall. Orcas Island. 



Astarte rollandi Bernardi. Port Graham, very common. 



Venericardia ventricosa Gld. Orcas Island. 



Nucula belloti A. Ad. Orcas Island. 



Yoldia ensifera Dall. Orcas Island. 



Yoldia limatula Say. Orcas Island. 



Yoldia thraciseformis Storer. Orcas Island. 



Glycimeris subobsoleta Cpr. Orcas Island. 



Mytilus edulis Linn. All points visited. 



Modiolus capax Conr. Orcas Island. 



Modiolus fornicatus Cpr. .Orcas Island. 



Modiolus modiolus Linn. Shore Orcas Island, Port Graham. 



Modiolaria laevigata Gray. Orcas Island. 



Modiolaria vernicosa Midd. Eliaraar. 



Pecten (Patinopecten) caurinus Gld. Orcas Island, 8 living and 

 several valves. 



Pecten (Chlamys) hastatus Sby. Orcas Island. 



Pecten (Chlamys) hastatus hericus Gld. Orcas Island. 



Pecten (Chlamys) hastatus hindsii Cpr. Orcas Island. 



Pecten (Chlamys) hastatus navarchus Dall. Orcas Island. 



Monia macrochisma Desh. Orcas Island. 



Terebratalia transversa Sby. Orcas Island. 



NOTES ON DAVI8IA AND MALVINA8IA. 



BY WM. H. DALL. 



In the Annals and Magazine of Natural History for January, 1910, 

 Messrs. J. E. Cooper and H. B. Preston described two supposedly 

 new genera of minute bivalves from the Falkland Islands. Through 



