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MPM—Milwaukee Public Museum

USNM—United States National Museum

UW—University of Wisconsin

GOR—Gilbert O. Raasch

UC—University of California

Two series of locality numbers are carried opposite the specific occurrences in Part I. The whole integers (e.g. 85x) are United States National Museum numbers, such as are listed under “ Localities” in Cambrian Brachiopoda (Walcott, 1912). Correspondingly, most of the specimens from localities designated by these numbers are in the collection of the National Museum. Many of the National Museum numbers in the present text are completely catalogued by Walcott.

The second series of numbers embraces the bulk of the material studied, namely that collected by the writer and now deposited in his personal collection, in the collection of the University of Wisconsin, and that of the Milwaukee Public Museum. No catalogue of this series has been printed, but some of the more prominent localities are described in Part III of this paper. The numbers, prefixed with the letter X express the state, quadrangle, specific locality, and, where a section has been measured, the specific bed number. Although many of the localities remain without a published key, their numbers effect a standardization as to the particular lot or faunule.

The following abbreviations are used to indicate abundance of fossils at certain localities:

AA = Very abundant

A = Abundant

CC = Very common

C = Common

CR = Not uncommon

R = Rare

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