GENERAL SCIENCE. 



629 



Layard, Daniel Peter, (cont.). An Account of the Somersham Water 

 in the County of Huntingdon. 8°. London, 1767. 



Pharmacopoeia in usum Gravidarum, Puerperarum et Infantum 



recens natorum, in cubiculo puerperarum Noaocomii Middlesexiee 

 primum anno 1747 concinnata et deinde anno 1749 accommodata 

 in usum Hospitii Britan. Puerperarum. 8°. Londini, 1776. 



Lazari, Vincenzo. Viaggi di M. Polo. See Polo. 



Lazesio, F. Feliciano de. See Feliciano de Lazesio. 



Lazius, Wolfgang. De Gentium aliquot Migrationibus, sedibus fixis, 

 reliquijs, linguarumque initijs et immutationibus ac dialectis, 

 libri xii. Fol. Basileas, 1557. 



Lea, Henry G. Descriptions of some new species of Marine Shells, in- 

 habiting the coast of the United States. 8°. Boston, 1844. 



Catalogue of the Tertiary Testacea in the United States. 



8°. Philadelphia, 1848. 



Xea, Isaac. Observations on the Genus Unio, together with descrip- 

 tions of new genera and species. . . . 



Vol. 1-13. 4°. Philadelphia, 1829-74. 



Vol. 3 wanting. 



Index to vols. 1 to 11. 4°. Philadelphia, 1867. 



Index to vol. 12, and Supplementary Index to vols. 1 to 



11. 4°. Philadelphia, 1869. 



Index to vols. 1 to 13. Vol. 3. 4°. Philadelphia, 1874. 



Contributions to Geology. 8°. Philadelphia, 1833. 



A Synopsis of the Family of the Naiades. 



8°. Philadelphia, 1836. 



Third edition. 4°. Philadelphia, 1852. 



Description of nineteen new species of Colimacea. 



4°. Philadelphia, 1840. 



Notice of the Oolitic Formation in America, with descriptions of 



some of its organic remains. 4°. Philadelphia, 1840. 



[Obituary Notice of Richard Cowling Taylor.] 



8°. Philadelphia, 1851. 



On the genus Acostaea of D'Orbigny, a Fresh- water Lamelli- 



branchia. 4°. Philadelphia, 1851. 



On a Fossil Saurian of the New Red Sandstone formation of 



Pennsylvania, with some account of that formation, also on some 

 new fossil Molluscs in the Carboniferous Slates of the anthracite 

 seams of the Wilkesbarre coal formation. 



4°. Philadelphia, 1852. 



On the Fossil Foot-marks in the Red Sandstone of Pottsville, 



Pennsylvania. 4°. Philadelphia, 1852. 



Rectification of Mr. T. A. Conrad's ' Synopsis of the Family of 



Naiades of North America.' 8°. Philadelphia, 1854. 



Description of a new Mollusk from the Red Sandstone, near 



Pottsville, Pa. 8°. Philadelphia, 1855. 



