DATES OP CONRAD. 
231 
Myoconcha incurva , and Pectunculus carolinianus. In March, 
1840, on the second page of the cover was added Area elevata 
from the Choptank river, Md. This cover in this state 
will be referred to as cover A; it was afterward used for 
some copies of Part 2. 
As regards the plates in Part 1, for Plate 3 in several 
copies is substituted a copper plate with the same species 
from the Journal Acad. Nat. Sci. In Gabb’s copy plate 7 is 
similarly replaced. Plate 9 has two states, one printed by 
Lehman and Duval and the other by Sinclair; the same is 
true of plate 10. These two are erroneously numbered xxii 
and xxiii and were perhaps originally drawn for the unpub¬ 
lished part of the Eocene volume. Plate 11 is sometimes 
replaced by Lesueur’s copper plate from, the Journal. 
No. 2 is marked May 7, 1840, in Conrad’s handwriting. 
It has in my copy the same cover which I have called A, 
except that on the fourth page of cover (about September, 
1841, as nearly as I can discover) diagnoses were printed of 
Pholas arcuata, Fulgur coronatus, Fulgur tuber culatus , and 
Fulgur fusiformis. 
The text extends from p. 33 to p. 56, inclusive, and the 
plates from 18 to 29, inclusive. Other copies have pages 2 
and 3 of the cover plain. 
Plate 19 has two states; the earlier has 8 figures, the view 
of figure 7 being double. The second state has plate number 
18 by error, and has fifteen figures which are not numbered 
with the same numbers as in the first state. On the latter 
fig. 6 was Amphidesma subreflexa, but it is Lucina (divari- 
cata —) Conradi Orb. on the second. The two figures marked 
7 on the first represent Amphidesma carinata , while on the 
second 7 indicates Lucina (squamosa =) speciosa Rogers. 
A. carinata becomes figure 11 and A. subreflexa fig. 12 in the 
second state of the plate and figures of the above-cited 
Lucinas and of L. crenulata (which also appear on the orig¬ 
inal plate 20), Nucula obliqua and IV. acuta (which also appear 
on plate 30). Plate 21 is numbered 23 by error. Plate 24 
32—Bull. Phil. Soc., Wash., Vol. 12. 
