IV. On the Connection between the Crag Formations and the Recent North Pacific Faunas

Abstract

All facts from stray sources bearing on the connection between the Newer Tertiaries and existing faunas are worth placing on record, as they may hereafter unexpectedly throw light on important points of inquiry. The existing faunas radiating from the Boreal districts may, indeed, be expected to have much in common, together with species peculiar to each ocean, and to each side of each ocean; and the correspondence extends to species living in the Temperate and even the Sub-tropical districts. Kellia suborbicularis, Lasea rubra, and Saxicava pholadis of the Coralline Crag are now living along the whole coast from Vancouver to the Acapulcan district: and Erato Maugeriw, whose head-quarters are now in the West Indies, appeared in the Coralline, did not disappear in the Red Crag, is now living in the Bay of Panama, and is nearly, if not quite, identical with E. columbella of the Gulf and the Temperate shores of California.