726 General Notes. 
We suspect that if we were to state that Mr. Lydekker had 
described the bones of a crocodile as those of an ostrich, and the 
teeth of a baboon as those of an ape, without at the same time 
stating that he had himself corrected those errors, he would not 
consider our method of criticism legitimate. And if we were to 
assert that in description he called the inside the outside, when he 
had not done so, and stated that a scientific body had published a 
plate which it did not publish, he would consider re wanting in a 
primary essential of criticism, viz., accuracy.—E. D. Cope. 
BIBLIOGRAPHICAL Notes ON THE Two Books oF CONRAD ON 
Tertiary SHELLS.—Having had occasion to see various copies of 
. A. Conrad’s “ Fossil Shells of the Tertiary Formations” and 
“ Fossils of the Tertiary Formations,” I have found that nearly all 
of them in some respects are deficient. In fact, I have not seen a 
single copy that gives perfectly all that has been published in the 
way in which it had been issued, and one finds in the literature 
quite a number of assertions which show an erroneous or imper- 
fect knowledge of these two works.! For this reason I consider 1t 
desirable to give the following notes :— a. 
1, “ Fossil Shells of the Tertiary Formations of North ere 
The two most complete copies which I have seen are those in the 
library of the Academy of Natural Sciences and my own. Neither 
7 perfectly complete, but both together furnish the following 
ata :—- r 
The book has been issued in two editions, the second were 
being a supplement to the first one. The first edition has bee 
issued in four parts. Yellow 
First edition: Part I. Pages 1 to 20, plates 1 to 6. thin 
cover, with date October 1, 1832. There 1s not mg 
rinted on the back of this cover. 
3 Part. II. Pages 21 to 28, plates 7 to 14. Yellow vei 
with the date December, 1832; a note by the author on 
fourth page. 
1 American Naturalist, 1888, p. 165. : dden- 
2? We suggest whether Mr. Lydekker has not referred, an hens of 
- Tetracerasi We did 
: thinking the author 
would correct it himself. 
