The Taconic — Marcou. 13 
" Lingula flags" of Wales, has recognized Emmons' genus as 
good, with the single reservation that his fossil from Wales, 
Microdicus 'ptcnctatiis " may be thejO^y of some larger trilobite." 
{^^ziart. yourn. Gcol. Soc, London^ vol. xx, p. 237, 1S64.) 
Other species belonging to the same genus have been dis- 
covered since in America; first by Hart, and then after him 
Messrs. Walcott and Ford have described five species, in 1868, 
1873. 76,77, and 86. 
As usual the adversaries of Dr. Emmons, seeming to be bound 
to reject all his discoveries, Mr. Walcott leaning upon the er- 
roneous idea that "Emmons' original name * * * ap- 
pears to have been founded on a specimen of the genus l^rlnu- 
cleus^'' is trying to change Emmons' name into Pempkigaspis 
Hall, given in 1863 to a small trilobite of Trempeleau, upper 
Mississippi valley. However Mr. Walcott has used the name 
Microdiscits in Bulletin U. S. Geol. Snr., No. 30, p. 153, 1886; 
a concession very reluctantly and only momentarily granted. 
Graptolites. The Graptolites have furnished the most 
constant weapon used to suppress the whole Taconic system. 
Mr. Walcott says: "In regard to the graptolites found near 
Hoosic, N. Y., I wish to state that I visited that locality and 
collected specimens of the flattened and distorted graptolites 
from the smooth shales. On comparing the specimens with 
those of Diplograptiis prist is from the Hudson terrane {sic) 
at Fort Edward, N. Y., and also from the Hudson terrane {sic) 
in the western part of the township of Greenwich, Washington 
Co., N. Y., I fully concur with the opinion given by professor 
James Hall in 1857 (" Pal. N. Y., vol. i, pp. 321, 323" — an er- 
ror, it is i^p. 365 to 26S, J. M. — PI. 73), that the Hoosick shale 
graptolite is identical with the Diplograptus pristis found in 
the Hudson terrane {sic)^ within the Hudson valley." {Loc. 
cit.^ p. 340.) It is simply an endorsement, a great deal more 
easy to give than it was for Mr. Walcott to indorse the errone- 
ous identification of Mr. Hall of the Atops trilineatzis with the 
Calymeue bcckii ; for a graptolite, to say the least, is always 
easily dealt with, being such a low form of animal. But with- 
out good figures and descriptions, the concurrence of opinion of 
Mr. Walcott with the one expressed by Mr. Hall, is valueless 
and can be classified with his concurrence of opinion for the 
