48 The American Geologist. January. 1904. 
Genesee province is divided into an eastern or Naples subprovince and 
a western or Chatauqua subprovince. The nature of the gulf in which 
this fauna flourished, its boundaries and connection with the sea, the 
origin and direction of migration of the fauna are fully discussed. Fol- 
lowing the technical description of the fauna is a discussion of the re- 
lations of the congeries to other manifestations of the Intumescens 
zone, and a noteworthy fact here brought out is the actual appearance 
in New York of a large number of species indicial of this horizon else- 
where, especially in Westphalia and Timan, and the much larger series 
of close relationships between the New York and Eurasian species. The 
author's conclusions as to the significance of the fauna, derived from 
this protracted and exhaustive study, are given in the "summary" as 
follows : 
"I. The fauna of the Naples beds, as the term has been heretofore 
employed and as used in the title of this work, is a congeries integrated 
by its organic characters and its bionomic relations from appearance to 
vanishment and unitive in its essentiality. With contemporaneous faunas 
of the Appalachian gulf it has, in its purity, no organic relation direct 
or sequential, but at the boundaries of the province may become im- 
plicated with the latter by the incident of geographic continuity. 
"2. This Naples fauna as a whole is geographically characterized 
with greater accuracy as that of the Genesee province. In its integrity 
it represents the Eurasian Upper Devonic faunas above the horizon of 
Hypothyris cuboides (Tully limestone of New York) and below the 
brachiopod fauna with culminating Spirifer disjunctus. In the New 
York sections, however, it is followed by and is, in part, contempora- 
neous with a tremendous development of the brachiopod fauna, which 
is equivalent in sequence and in composition to that of the Condroz and 
Famenne sands of Belgium, etc. 
"3. The geographic subdivision of this integral into (i) the Naples 
and (2) Chautauqua subprovinces, determinates : (a) the early arrival 
of the lower fauna in the Genesee province, its primary occupancy of the 
entire area, its eventual profuse development at the eastern end of the 
province till the incoming of the brachiopod fauna from the east; (&) 
the subsequent arrival of the organic assemblage which more fully ex- 
emplifies the later stages of the Eurasian fauna, stratigraphically se- 
quential to the feeble western development of its predecessor, profuse 
in its own development in its proper province, but unable to penetrate 
the province of its antecursor, consubstantial and contemporaneous with 
it during all its own stages, but during the later stages only of the an- 
tecedent fauna. 
"4. The fauna in its entirety shows a subversion of the facial dif- 
ferentials distinguishing its European phases, and species there recog- 
nized as successional indexes are here disvalued {Clymenia, Entomis 
serratostriata, Chiloceras). On the other hand, entire convergence of 
faunal differentials is not effected, and certain indexes retain their value 
in both lower and higher components of the fauna. 
