44 



By Purchase. 



The Silurian System, founded on geological researches in 

 the counties of Salop, Hereford, Radnor, Montgomery, Caer- 

 marthen, Brecon, Pembroke, Monmouth, Gloucester, Worcester, 

 and Stafford, with descriptions of the coal fields and overlying 

 formations. By Roderick Impey Murchison, F.R.S., F.L.S. 

 3 vols, and separate map, 4to. London, 1839. 



Odontography, or a Treatise on the Comparative Anatomy 

 of the Teeth : their Physiological relations, mode of develope- 

 ment, and microscopic structure in the vertebrate animals, 

 illustrated by upwards of 150 plates. By Richard Owen, 

 F. R. S., &c. London, 1841, royal 8vo. 



Memoirs of Ichthyosauri and Plesiosauri, with numerous 

 Plates, by Thomas Hawkins, F. G. S., London, 1834 ; and the 

 book of the Great Sea Dragons, by the same, 1840 ', bound 

 together in one vol. folio. 



A Conchological Manual, by G. B. Sowerby, Jun., illustrated 

 by upwards of five hundred figures, (coloured copy), 1 vol. 

 8vo., London, 1839. 



A History of British Birds, by William Yarrell, F. L. S., 

 illustrated by 520 wood engravings ', 3 vols, and supplement, 

 8vo. London, 1843. 



A Manual of the Land and Fresh- Water Shells of the British 

 Islands, with figures of each of the kinds, by William Turton ; 

 a new edition, thoroughly revised and much enlarged, by 

 John Edward Gray, F.R. S., &c., 8vo., London, 1840. 



Nomenclator Zoologicus continens Nomina Systematica 

 Generum Animalium tam viventium quam fossilium, secundum 

 ordinem alphabeticum disposita, adjectis auctoribus, libris in 

 quibus reperiuntur, anno editionis, etymologia, et familiis ad 

 quas pertinent, in variis classibus, Auctore L. Agassiz : — 



Fasciculus I. continens Mammalia, Echinodermata et 

 Acalephas ; 



II. Aves ; 



III. et IV. Crustacea et Vermes, i. e. Entozoa, Turbellaria et 

 Annulata ; Hemiptera et Infusoria ; Polygastrica et Rotatoria ; 



