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V !.KA, ISAAC. Descriptions of three new 

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Proc. Acad. Nat. Set. Philn.. 1871, 

 p. 188. 



Descriptions of twenty new Uni- 

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Proc. Acad. Nat. Sci. Phila., 1S71. 

 pp. 189-193. 



Descriptions of twenty-nine Union- 

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Proc. Acad. Nat. Sci. Phila., 1872, 

 pp. 155-161. 



Rectification of Conrad's Synopsis, 

 etc., 1872. 



* Description of seven new Union- 

 id JB, etc. 



Proc. Acad. Nat. Sci. Phila., 1874, i 

 pp. 422, 423. 



Descriptions of three new Uniones j 

 from the United States. 



Proc. Acad. Nat. Sci. Phila., 1873, p. 

 424. 



Description of fifty-two species of 

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Jour. Aca-L Nat. Sci. Phila., 1874, 

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* Observations, etc., XIII, 1874, pp. 



75, 22 plates. 



*- Index to Volumes I-XIII, Observa- 



tions, etc., 1874, 29 pp. 

 LKA, ISAAC, and BINNEY, W. G. Ex- 

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Hep. on Geol. and Nat. Hint., of Ne- \ 

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* LEACH, WILLIAM ELFORD. The Zoo- 



logical Miscellany, 1815. 



* A synopsis of the Mollusca of Great 



Britain, 1852. Completed by J. E. 

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LKK, W. S. How the Muskrat opens the 

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Jour. Trenton Soc., 1, 1886, p. 8. 



* LF.ENWENHOEK, ANT. VON. Arcana Na- 



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 LE GOUVIBRIE, T. La peche anx perles 



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 *LKHMAN, R. Die Schnecken and Mus- 



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 *LEII>IG, . In Mollnsken der Main, 



1866. 

 *LEII>Y, Jos. [On the Parasites of Ano- 



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Proc. Acad. Nat. Sci. Phila., 1857, p. 



18. 



*LEIDY, Jos. On the reproduction and 

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Proc. Acad. Nat. Sci. Phila., 1883, 

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 LELIEVRE, A. Clef diohotomiqae pour 

 la determination des Mollusques <ln 

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Bull. Sci. Dep. Nord, 1878, pp. 81, 

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*LEMON, JAMES H. Interglacial Shells 

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Nautilus, XII, 1898. pp. 6, 7. 

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1784. 

 LESSER, CREUSE DE. Statistique du 



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 ^LESSER, FREDERIC CHRISTIAN. Testa- 

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*LESSON, R. P. Voyage de la Ooquille. 

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Synopsis Me'thodiqne des Mollus- 



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LETOURXKUX, ARISTIDE. Mollusques 

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LETOURNEUX, TACITK. Catalogue des 

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Kev. et Mag. Zool., XX., 1869, pp. 

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Separate. 



*LETOURNEUX, A., and BOURGUIGNAT, J. 

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LEVILLE, J. B. T. Manuel d'histoire 

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*LEWIS, JAMES. [List of Mollusca in 

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Proc. Acad. Nat. Sci. Phila., 1856, 

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* [On Alasmodonta marginata Say.J 



Proc. Bosl. Soc. Nat. Hist., V, 1854, 

 pp. 120-124. 



* Notes on Mollusca. 



Proc. Boat. Soc. Nat. Hist., 1855, pp. 

 121-124. 



[On the Shells of New York]. 



Proc. Boat. Soc. Nat. Hist., 1856, pp. 

 295-298. 



