232 
BALL. 
has two states, one in which the inside of the valves is 
shaded, while the other has it white. 
No. 3 has a new cover, marked “ Fossils of the Miocene 
formation of the United States; ” otherwise the first side is 
like that of the cover of Nos. 1 and 2. On my copy in Con¬ 
rad’s handwriting is the date, “ Jan., 1845.” The text in¬ 
cludes pages 57-80, and the plates 30-32 and 34-44, no plate 
33 having existed. I have seen no variants of the plates of 
this number. Except the first page, the cover is blank ; on 
the front of it, after the word “ Miocene,” Conrad has written 
in the words “or Medial Tertiary,” in my copy. On page 
77 is a reference to H. C. Lea’s Teredo fistula , which was not 
described until 1845, but the reference is not complete and 
was probably taken from a specimen donated to the Academy 
by Mr. Lea, who published a list of names, without descrip¬ 
tions, in the Proceedings of the Am. Phil. Society before his 
paper in the Transactions was printed. No. 4 comprised 
pp. 81-86, descriptions of species, and 87-89, index, followed 
by plates 45-49. The last leaf of the cover was blank on 
both sides, as well as the second page of it. On Gabb’s copy, 
under date of August 10, 1861, he has written the following 
remarks: 
“ From page 81 to end of the text was first published in 
1861, about March or April, I believe; perhaps later, cer¬ 
tainly not earlier.—W. M. G.” 
The following list of species published in the “ Medial 
Tertiary ” may be of use to students. The abbreviations 
used to indicate places of prior publication or other refer¬ 
ences are, J. Ac., for Journal of the Academy of Natural 
Sciences; Proc. Ac., Proceedings of the Academy ; Eo. fos., 
for Conrad’s Fossils of the Tertiary formation N. Am., 1832- 
’42; S. J., for Silliman’s American Journal of Science and 
Arts; Am. Ph., for Transactions American Philosophical 
Society; Am. Con., for Say’s American Conchology; Min. 
Con., Sowerby’s Mineral Conchology; Mar. Con., Conrad’s 
American Marine Conchology, etc. The references have 
