Geology. 279 
closely at the plates of the Mexican Boundary Report, I found on the 
last plate, No, xx1, fig. 8a, 3b, 8c, a specimen of Gryphea Tucumcarii 
under the false name of Gryphea Pitcheri. Mr. Conrad in his description 
of Gryphea Pitcheri, p. 155, makes no reference whatever to that plate, 
nor to the figures 3a, 3b, 3c; and in the explanation of Prof. Hall’s Re- 
port, p. 174, nothing is said of the locality or the stratigraphical position 
of this fossil. The plate was drawn by Mr. F. B, Meek, who has put it 
under the head of Cretaceous.” 
ven goes on to intimate that I had either myself, or in connec- 
Conrad intended to intimate the same thing. Thus he says, “ desirous to 
know the opinion of Mr. Conrad on this incomprehensible and doubtful 
proceeding, I wrote him, and give below his answer :”— 
« Philadelphia, January 25th, 1861, 
e of : l ; 
cartt as figured on plate xxr. Prof. Hall thought they graduated into G. Pitcheri, 
i a cies ought not to have 
identical with your species or no 
The locality of the @. Pitcheri (page 155 Leon Springs, crim Case 
mesha, Arkansas; New Braunfels, Texas; Fort Washita and ae aera i 
are correctly given from mss, accompanying the specimens. T, A. Conran.” 
Sincerely yours, 
Mexican Boundary Re- 
wise,—I knew it was utterly im 
Suspected, when he was iia his letter quoted above, the nature of t 
Construction Mr. Marcou would place upon it. Consequently om SES 
Mr. Marcou’s paper I wrote Mr. Conrad on the subject, and received the 
following reply :— 
Sicgagueshd wat pede 
My Dear Sir— i t your name has int I 
to the Palponeciciar Ra gsghiecet Boundary Survey. You certainly had no 
i . know of, ex- 
connection with it other than drawing the plates, and never, t I . 
n opinion of ley ies snad in that — y oma that “* ‘ 
2 ought aced as nonym to , 
that J should sit t raed i agen was not entirely satisfied of the identity of G 
Pitcheri . Tucumearit. Talone am responsible for the oa if there : 
Teither made the refere yself, or authoriz of. Hall to make it © Ret aad 
figure on plate xxt, to the best of my recollection was engra cle aie ok 
sent in my report, but no one excepting myself is responsible for omitting any 
Eee In my repent. T T. A. Conran. 
ruly yours, | 
_ ima postscript to this letter Mr. Conrad also states, amongst other 
things, that Hh now satisfied that the so-called G. Tucumcari 1s the 
