History of Conchology in the United States, 165 
Dr. S, P. Hitprern, of Marietta, Ohio, a well known contrib- 
utor in other departments to this Journal, published in the first 
series, vol. xiv, 1828, an interesting paper on the shells inhabit- 
ing the vicinity of that town. 
Saac Lea, President of the Academy of Natural Sciences, 
contributed his first paper on Conchology to the Philadelphia 
Philosophical Transactions, vol. iii, 1828; and from that date 
to the present time, a period of thirty-four years, he has given 
Unceasing attention to the science, and particularly to his chosen 
He has contributed two hundred fon to the Proceedings 
of the Academy, and of the Philosop 
about 550 species of Naiades, 400 species of Melanians and other 
fresh water shells, and 50 species of Terrestrial shells. 
._ +hey have also been issued in eight quarto volumes, containing 
in all 850 pp. and 198 plates, as follows: 
i 1832, pp. 230. From Philos. Trans, 11, rv, v. 
“= “ “ “ VIL 
stag 1838, pp. 152. : 
os 1842, pp. 88. MESS VIII. 
“ Iv. 1845, pp- 75. od “ . 1x, b= 
seas 1852, pp. 62.“ x 
vt 1858, pp. 96. From Trans. Acad. Nat. Sci. m, rv. 
. : “ “ “ “ IV. 
ve 1859, pp. 90. s 
* “ “ “ Iv. 
vat. (Part I.) 1860, pp. 56. 
grouped according to. 
Vious external characters, in order to facilitate their determina- 
Won. There is also a table of geographical distribution, and a 
very full index and bibliography of the subject; making aaa 
book an indispensable aid to those studying this interesting tam- 
shells, : 
. 4 
— The third editi f the Synopsis was issued in 1852. (4to, 
fe. 88.) ee ‘that sine ‘haat Hew species of Naiades have 
Retin described, rendering a new edition necessary ; and on 
“Setul work, Mr i ; : ; 
He has also iatcayeay” sited the Melanians of sar) 
besides describing many exotic species for the Zoological 
4ondon, 
