INTRODUCTION 
This work is essentially an index and reference list to the sone 
ature on the Eublastoidea; with it the compiler had in view the i 
of making it possible for the user, either in the field or laboratory, 
to find a ready reference to the spina covering every species 
ieauithed from North American formations. 
The literature dealing with North aa species of the Eubla- 
stoidea is scattered through a great number of State and Federal 
publications, ieee s and Transactions of learned societies, ex- 
tending back over a period of more than one hundred years. 
(1825-1932. ) 
Many of the species published by the earlier writers have never 
been properly illustrated and many will doubtless prove to be 
synonyms and will be eliminated in a synopsis of the group, upon 
which the writer is now engaged. 
With the exception of Owen’s “Catalogue of Geological Speci- 
mens from the Ohio Valley, 1843,” every erige recorded in the 
index has been read by the compiler, and the plan has been to 
pe as far as practicable, that used in dealing et other groups 
of fossils. 
The compiler is greatly indebted to the officials of Ridgely 
Library, Washington n eee for their assistance in procurin 
the loan of numero rare papers. Also he is equally indebted to 
research, for a grant to cover the expense of preparation of the 
paper. 
