BIBLIOGRAPHY OF PUBLICATIONS OF ISAAC LEA, LL. D. 57 



78. 



1852. Lea, Isaac. On some New Fossil Molluscs in the Carbouiferons Slates of the 



Anthracite Seams of the Wilkesbarre Coal Formation. <^Journ. Amci. Nat. 



(Set., P/(i?rt.,ii, New Series, Part III, pp. 203-206. Plate xx. For separate see 



No. 79. 



Read before the Academy iSTatural Sciences, May 18, 1852. Extra copies printed for the 



author June, 1852. (See Journ. Acad. Nat. Sci., PMla., ii, N. s., p. iv.) 



Modiola Wyomingensis, Lea, n. s, pi. -0, fi;?. la 205 



Modiola minor. Lea, n. s., pi. 20, fig. 2 205 



Posidonia ? claihrata. Lea, n. s., pi. 20, fig. lb 205 



Posidonia 1 perstriata, Lea, n. s., pi. 20, flg. 3 a 205 



Posidonia ? distang, Lea, n. s., pi. 20, flg. 3 b 205 



Palceoniscus ? Leidyiana, Lea, n. s. , pi. 20, figs. 4, 5 --, 206 



79. 



1852. Lea, Isaac. Descriptions of New Species of the Family UniouiclsB. <^Trans. 

 Amer. PhUos. Soc, x, pp. 253-294. 



Bead before the American Pbiloso])hical Society, March 5, 1852. Presented to the Acad- 

 emy of Natural Sciences, Phila., Juno 1, 18.52. (See Proc. Acad. Nat. Sci.. Phila., vi, p. xxii. 

 (With No. 81 and No. 82 forms No. 83.) 



A li.st of the species without remarks or descriptions was printed in the Proc. Amer^ 

 PMloa. Soc, V, 1852, pp. 251-252. 



"It is now some years since I presented to this society a continuation of my discoveries 

 of new forms from the fresh waters and soil of the United States. Since that period, owing 

 to the kindness of many valued friends, I have been enabled to get together a much larger 

 number by far than could have been anticipated. These have come chiefly from localities- 

 hitherto little examined, and which have produced new species more or less interesting. 



"I am aware that many persons doubt the existence of so extended a production of spe- 

 cies, but this arises from the want of a knowledge of them, closely cultivated and analyti- 

 cally examined. An organic form, instituted by nature, must be recognized as distinct, for 

 it will remain in a state of autonomy to the end of its term. It is the duty of the zoologist 

 to bring to the investigation an eye practiced in discrimination, and a judgment experienced 

 in analy.sis, as well as also an honest intention of iuirpo.se, that he may give the best and mo.st 

 accurate results to his investigations." 



TInio sordidis. Lea, n. s., pi. sii, fig. 1 254 



Abbeville District, S. C, J. P. Barratt, M. D. 



TInio Gibbesianus, Lea, n. s., pi. xii, flg. 2 254 



Abbeville District, S. C, Louis E. Gibbes, M. D. 



■ TInio pcrstriatus. Lea, n. s., pi. xii, flg. 3 255 



Abbeville District, S. C, J. P. Barratt, M. D. 



TInio Tuomexji, Lea, n. s., pi. xiii, fig. 4 ^. 256 



Abbeville District, S. C, J. P. Barratt, M.D. 



Unio Barrattii, Lea, n. s.. pi. xiii, fig. 5 256 



Abbeville District, S. C, J. P. Barratt, M. D. 



TInio decoratus, Lea, n. s., pi. xiii, fig. 6 257 



Abbeville District, S. C, Dr. Barratt and Mr. Tnomey. 



TInio riifuscidiis, Lea, n. s., pi. xiv, fig. 7 258 



Abbeville District, S. C, J. P. Barratt, M.D. 



Ujiio Whiteianus, Lea, n. s., pi. xiv, fig. 8 258 



Near Savannah, Georgia, Rev. G. "White. 



Unio Lazarus, Lea, n. s., pi. xiv, fig. 9 259 



Abbeville District, S. C, J. P. Barratt, M.D. 



TInio merus, Lea, n. s. , pi. xv, fig. 10 260 



AbbevUle District, S. C, J. P. Barratt, M. D. 



TInio concavus. Lea, u. s., pi. xv, flg. 11 260 



Abbeville Di.strict, S. C, J. P. Barratt, M. D. 



Unio ineptus. Lea, n. s., plrxv. tig. 12 261 



Abbeville District, S. C, J. P. Barratt, M. D. 



Unio buxeus, Lea, pi. xv, fig. 13 261 



Abbeville District, S. C, J. P. Barratt, M. D. 



Uiiio pygmceiig. Lea, n. s., pi. xv, fig. 14 262 



Abbeville District, S. C, J. P. Barratt, M. D. 



Unio fraternns, Lea, n. s., pi. xvi, fig. 15 203 



Columbus, Georgia, Dr. Boykin; Abbeville District, S. C, J. P. Barratt, M. D. 



