Mesozoic Series of New Mexico. — Marcoii. 1G3 
and notwithstanding this it has absolutely nothing in com- 
mon with the G. pitcheri figured on the same plate. The 
description is inexact and fails completely to give an idea of 
the fossils; and besides the assimilation that Mr. Hall 
attempts to make with the G. vesicularis of the white chalk 
is as faulty as it is possible to imagine, for the two Grijphcea 
have no resemblance whatever. 
As to the Grt/phcea pitcheri which Mr. Hall calls var. 
7iavia, it is the true G- pitcheri of Morton and Koemer, found 
by me at Comet cjeek near the False Washita river. Mr. Hall 
has copied on his plate the figures of my plate of the Bulletin 
soc. c/eol. de France, and he was plainly so little acquainted 
with the fossil that he put fig. 10 as the side view of fig. 9, when 
it is the side view of the upper valve of Gryphma tucumcarii, 
which has nothing to do with the Comet creek specimen. Mr. 
Hall is also incorrect in the locality given {Facile E. R. 
explorations, vol. iii, p. 100), saying: "The same {G. pitcheri 
var. navia) has likewise been brought from numerous other 
localities in the west." That ^'n/z^Afca has actually never been 
found in the west, and the numerous palreontological publica- 
tions of Meek do not make any mention whatever of its exis- 
tence in a single western locality. It was never found outside 
of the Indian territory and Texas, and last year only in south- 
ern Kansas, ^vhich seems to be its northern limit. 
One example, among many which could be quoted, will 
show the influence exercised by the erroneous determination 
of my Jurassic fossils of the Tucumcari area by Mr. Hall : 
"Although some of the strata which Mr. J. Marcou described 
as Jurassic and Triassic are, perhaps, of that age, still he 
based his conclusions chiefly upon fossils which have since 
been recognized as Cretaceous forms." {Explorations across 
the Great Basin of Utah in 1S5V. Simpson. Geology by H. 
Engelmann, p. 274, Washington, 1876). 
Everything is so inaccurate in Mr. Hall's identifications, 
descriptions and figures that we are driven to the conclusion 
that his knowledge of the genus Gryha'a is well nigh a blank, 
as well zoologically as geologically. 
185S AND 5V), NkwbeuuV.— In 1858 Dr. J. S. Newberry made 
a reconnoissance in New Mexico which touched my road of 
1853 from Aztec Pass in Arizona, to Pecos village. Here is 
the resume of his classification : 
