AYCENTURY OF PROGRESS IN PALEONTOLOGY: ‘499 
In the earlier volumes of the paleontology of New York, the 
faunal classification of fossils is predominant. Many new species 
and genera are described as members of the faunas under discus- 
sion, there being no elaborate investigations into the natural tax- 
onomic grouping of organisms. In volume four of the work we 
begin to see the deviation of the line of investigation toward the 
biologic side, the faunal grouping being made subordinate to the 
taxonomic. This same subordination is seen in volumes five, six, 
and seven, while in volume eight we find the faunal classification 
entirely displaced, and the whole volume devoted to the treat- 
ment of the genera of Paleozoic brachiopods. We have, there- 
fore, inthis series of volumes an exhibition of the development of 
the science asillustrated by the life work of oneman, from the fau- 
nal classification in 1847, through the mixed faunal and biologic, 
to the purely biologic classification in 1894. 
This differentiation of the science, which has become nearly 
accomplished at the present time, is well exhibited in the charac- 
ter of the paleontologic monographs which have been published 
during the past decade or less. On the one hand such works as 
Wachsmuth and Springer’s monograph of the ‘‘Crinoidea Came- 
rata,’ a work which is strictly biologic in its treatment of this 
extinct order, is an illustration of one division of the subject, and 
on the other hand may be mentioned Walcott’s ‘‘ Fauna of the 
Olenellus Zone,” where the biologic treatment of the fossils is 
made entirely subordinate to their faunal associations. 
While these two branches of paleontologic science have been 
differentiating, the older method of investigation has by no means 
disappeared, and during this whole century of progress there 
have been appearing constantly contributions to paleontology of 
the ‘‘scrapbook”’ order. Among the more recent of these made 
upona large scale may be mentioned the series of bulletins which 
have been issued from the Illinois State Museum of Natural His- 
tory during the past decade. In these contributions some 
hundreds of species have been described, belonging to various 
classes and orders of organisms and from various geologic hori- 
zons, but they have contributed little or nothing either to the 
