The Galeini and 3Ir(qaoketa Series. — S'ardeson. 333 
The foregoing table will show the relation of the two s_ysteins 
of nomenchiture with respect to the correlated divisions, the 
subdivisions being omitted. 
Tlie two columns on the left side of the diagi-am show the 
application of Winchell and Ulrich's correlation of the two 
series and their divisions, while the two columns on the I'ight 
show the classitication that I have adopted, as before described. 
The smaller divisions are placed in the middle columns of the 
diagram to facilitate comparison. The name Richmond lime- 
stone seems to have no claim to priority over any other term, 
and it should be rejected in this area at least. 
Oscar H. Hershey has recently used the name Pecatonica 
limestone for that which Winchell and Ulrich call Stones 
River; a new name the use of which scarcely accords with sci- 
entific usage, since that author neither defines the term Peca- 
tonica limestone nor seemed to have any reason for introduc- 
ing a new name. He w^as discussing an entirely distinct 
subject* and so far as I can learn, he had no more occasion to 
introduce a. new name for a part of the Ordovician, than one 
who is writing on the Ordovician would have to suggest a new 
name for some part of the Pleistocene. Notice of the name 
"Pecatonica limestone" is given place here, however, lest the 
name be sometime resurrected to the confusion of nomencla- 
ture. 
Another source of confusion in nomenclature is a kind of 
systematic substitution of allied names, the classification re- 
maining the same. The following quotations will serve to 
illustrate the argument that is given in support of such 
changes, and the nature of the change itself. "Really, Dr. 
Sardeson's name" (Camarella bed) "must be thrown out alto- 
gether for the simple reason that, according to the investiga- 
tions of Winchell and Schuchert, and those recentty published 
by Hall and Clarke, one of his supposed Camarellas proves to 
belong to the new genus Parastrophia H. and C, while the 
other is the type of another new genus and is now called Cij- 
dospira bisiUcata.''' Again the words, "The upper member of 
his Orthisina bed (Clitambonites bed of this book,)"f show 
*Preglacial Erosion Cycles in Northwestern lihnois, American Ge- 
ologist, vol. XVIII, p. 72. 
tSee Final Rep. Geol. Sur. Minnesota, Introduction, p. xcix, bottom 
f)f page. 
