Mesozoic Series of New Mexico. — Marcou. IGl 
been given, until 1887. And more, until now, it has been the 
custom amon<; paheontologists to quote all the fossils de- 
scribed and figured by their predecessors; but an exception 
has been made for me, and Dr. Benjamin F. Shumard, F. B. 
Meek, and Dr. Charles A. White have simply passed over my 
palffiontological work on the Mesozoic fossils of Texas and 
New Mexico, as if it did not exist. Dr. C. A. White goes so 
far in his "Review of the fossil Ostreidai of North America" 
{Fourth Ann. Rep. U.S. Geol. survey, 1884), as to give as a 
new species, under the name Exogyra walkeri, an enormous 
Gri/p/uca, the largest existing in America, which I have 
described with a splendid figure as Gryjihaia sinuata var. 
anicricana, thirty years before him ; and he adds that the 
G. pitcheri described by Morton was originally discovered in 
the Cretaceous strata of New Jersey, contrary to the printed 
opinion of Dr. Morton and where the G. pitcheri does not 
exist. Finally on plate xlix, he gives Fig. 3, the lower valve 
of my G. dilatata var. tucumcarii as belonging to the 
G. pitcheri, thus adding to the confusion introduced by the 
determinations of Mr. Hall. The only geologist who has 
quoted my Mesozoic fossils of Texas, is professor Robert T. 
Hill, in his paper : "The Texas section of American Creta- 
ceous" (Amer. Jr. Sci., vol. xxxiv, 1887) and he, probably 
misled by the determination of Mr. Hall, has confounded the 
G. dilatata var. tucumcarii with the G. pitcheri; and the 
Ostrea marshii with the Ostrea suhovata; only now, after a 
visit to the Little Tucumcari mountain, in September, 1888, 
he is convinced that the Gryphcea tucumcarii, is an entirely 
different species from the Gryphcea jntcheri, and was rightly 
referred by me to the Jurassic type of Gryphcea dilatata. As 
the main part of the controversy and the principal ground 
for the rejection by Mr. Hall and his associates of the exis- 
tence of the Jurassic system at the Tucumcari area is based 
on the erroneous identification of the Gryphiva tucuincarii 
with the Grypha^a pitcheri, I shall quote Mr. Hall's own 
words : 
"In a section of Pyramid mount given by Mr. Marcou ( Bul- 
letin Soc. Geol. de France, tome xii, p. 878) he recognizes a 
series of sandstones and clays beneath limestones, which are 
of unquestionable Cretaceous age. 
