lo 'The Taconic — Marcou. 
PALiEONTOLOGIC AND STRATIGRAPHIC "PRINCIPLES" 
OF THE ADVERSARIES OF THE TACONIC. 
BY JUI.ES MARCOU. 
The publication by Mr. Charles D. Walcott of his opinions, 
views and "principles," in order to have the question of the 
Taconic system " intelligently understood and decided," is a 
proper occasion to show the way in which the adversaries of 
the Taconic have constantly made use of and are still making 
use of palaeontologv, stratigraphy and lithology. 
The paper of Mr. Walcott is entitled, " The Taconic system 
of Emmons, and the use of the name Taconic in geologic no- 
menclature," with a plate containing, "geologic map of jDortions 
of eastern New York, western Vermont, western Massachusetts, 
and northwestern Connecticut, compiled under the supervision 
of Chas. D. Walcott;" and a section crossing the original Ta- 
conic area in Washington Co., N. Y., from Northumberland, 
the Hudson river. Fort Edward, south of Argile and Salem, 
and cutting through Bennington Co., Vermont. ( Amer. Journ. 
Sci., vol. XXXV, March, April and May, iSSS, pp. 229, 307 and 
394, New Haven.) 
Pai,.-eontology. 
Trilobites. Dr. E. Emmons described in 1844 Atops tri- 
lineaUis, a new genus and new species of trilolites. "]Mr. James 
Hall insisted upon the identity of the Atops and Triarthrns ^ 
notwithstanding the decision years ago by a committee of the 
American Association of whom (sic) Conrad was a member, 
was against Hall."' Suppressing the genus and the species, Air. 
Hall has identified that primordial trilobite with the Calynioie 
{^Triat'thrns^ beckii of the Utica slate, a trilobite very abundant 
and characteristic of the upper part of the second fauna. Mr. 
Fitch in 1849 followed Mr. Hall's determination. 
Barrande in 1861,' disputes Mr. Hall's determination and 
maintains Emmons' opinion; saying in regard to Atops punc- 
^ Letter from Emmons to J. Marcou {Proceed. Amcr. Acad. Arts and 
Sci., vol. xii, p. 188, Cambridge, 18S5). 
2 " Documens sur la fauna primordiale et le Taconique, etc." (B/dte- 
tin soc. gcol., France, vol. xviii, pp. 269, 270 and 271, Paris.) 
