218 
DALL. 
were right in thinking that Mr. Lea was endeavoring to 
anticipate him. 
On the other hand, Mr. Lea considered that he had a per¬ 
fect right to publish on Tails fossils without reference to 
Conrad’s subsequent collections, and regarded the publica¬ 
tion of No. 4 as an attempt to deprive him of the fruit of his 
labor and expense. The copies of No. 4 were bought up and 
destroyed as far as possible, and Mr. Lea, in accordance with 
a very ancient usage, claimed priority for his descriptions 
from the date of the presentation of his paper at the Acad¬ 
emy, a priority which the friends of Conrad, in accordance 
with more modern custom, refused to admit. The result was 
a serious breach between the naturalists at Philadelphia, 
who were divided into the partisans of one or the other 
geologist, and the differences thus begun continued to exist 
for many years, with unfortunate results for science. 
COLLATION OF THE WORKS REFERRED tfO. 
Yol. 1. No. 1. Fossil Shells | of | the Tertiary Forma¬ 
tions | of North America. | Illustrated by figures drawn on 
stone | from nature. | By T. A. Conrad, | Member of the 
Acad. Nat. Sc. of Philada. | Contents. | Area limula [15], 
tab. 1, fig. 1. A. transversa [15], tab. 1, fig. 2. A. stilli- 
cidium [15], tab. 1, fig. 3. A. centenaria [16], tab. 1, fig. 4. 
A. idonea [16], tab. 1, fig. 5. A. incile [16], tab. 2, fig. 1. 
Pectunculus pulvinatus [17], tab. 2, fig. 2. P. subovatus 
[17], tab. 2, fig. 3. Murex umbrifer [17], tab. 3, fig. 1. Fu- 
* sus exilis [17], tab. 3, fig. 2. F. sulcosus [18], tab. 3. fig. 3. 
F. strumosus [18], tab. 3, fig. 4. Fusus trossulus [18], tab. 
3, fig. 5. F. tetricus [18], tab. 3, fig. 6. F. rusticus [18], 
tab. 4, fig. 1. F. parilis [18], tab. 4, fig. 2. F. cinereus [19], 
tab. 4, fig. 3. Buccinum porcinum [19], tab. 4, fig. 4. B. 
laqueatum [19], tab. 4, fig. 5; B. altile [19], tab. 4, fig. 6. 
Cypricardia arata [20], tab. 5, fig. 1. Cardita planicosta [20], 
tab. 5, fig. 2. Artemis acetabulum [20], tab. 6, fig. 1. 
| Philadelphia: | Sold by Judah Dobson, No. 108 Chest¬ 
nut St. | October 1, 1832. | 
