II.-THE WRITINGS OF TIMOTHY ABBOTT CONRAD. 



Conrad, T. A. Observations on a portion of the Atlantic Tertiary region, with a de- 

 scription of New Species of organic remains. <^2d. Bull. Proc. Natl. Institution, 

 pp. 171-194, pis. i and ii. Washington, 1842. 



Page. 



Section of the cliff at Claiborne I74 



Clasaification of Tertiary formations 178 



Table of Atlantic supracretaceous deposits 177 



Geographical range of Lower Tertiary 178 



Geographical range of Medial Tertiary I79 



Localities of the Upper Tertiary 17g 



Medial Tertiary period .„ 180 



Section at Fair Haven 181 



List of species obtained 181-182 



(Section) Cliff near Beckett's ., 182 



(List of fossils) .^ 185 



(Section) Saint Mary's River „. 185 



Organic remains found on Saint Mary's Eiyer 186-187 



Post-Pliocene period .». I87 



Upper Tertiary formation 187 



(Sections near Patuxent River) 188 



Section near the mouth of Potomac 189 



(List of species) ^ 190 



List of Fossil shells at Benner's 191-192 



Descriptions of new Tertiary fossils 192 



Lower Tertiary or Eocene fossils 192 



Ostrea, Linnaeus 192 



0. teUceformis, n. s., Conrad, 1842, pi. i, fig. 1 _ 192-193 



Pholadomya _.. I93 



P. marylandica, n. s., Conrad, 1842, pi. 1, flg. 3 193 



Pholat 193 



P.petrosa, n. s., Conrad, 1842, pi. ii, flg. 4 193 



Isocardia, Lamarck I93 



1. markoei, n. s., Conrad, 1842, pL ii, flg. 1 193 



Peeten, Lamarck I94 



P. humphreysii, n. s., Conrad, 1842, pL ii, flg. 2 I94 



Digpotoea, Say 194 



D. conttricta, n. s., Conrad, 1842, pi. i, flg. 2 I94 



Scalaria, Lamarck I94 



S. expansa, n. s., Conrad, 1842, pi. ii, flg.3 194 



Suceinum, Lamarck .......i ............. 194 



B. integrum, n. s., Conrad, 1842, pL ii, flg. 6.- ., 194 



SeuteUa, Lamarck I94 



S. aberti, n. s., Conrad, 1842 I94 



2. 



Conrad, T. A. [Descriptions of the fossil shells of Astoria, Oregon.] <U. S. Expl. 

 Exp. under the command of Charles Wilkes, vol. x. Geology, Appendix i, pp. 

 723-728, pis. xvii-xxi. Philadelphia, 1849. 



Page. 



Mya abrupta, n. s., Conrad, 1849, pi. xvii, figs. 5, 5 a 723 



Thracia trapezoids, n. s., Conrad, 1849, pi. xvii, figs. 6 a, ft 723 



Solemya ventricosa, n. s., Conrad, 1849, pL xvii, flga. 7,8 723 



205 



