Analysis of Periodical Works on Natural History. 451 



der the direction of the latter gentleman, with the assistance 

 of Professors Leslie and Wallace, and of other gentlemen of 

 the University of Edinburgh. 



An Elementary Treatise on Optics. By the Rev. Henry 

 Coddington, M.°A. Fellow of Trinity College, Cambridge. 

 In one volume 8vo, with Plates, price 8s. boards. 



An Inquiry into the Principles of the Distribution of Wealth 

 most conducive lo Human Happiness; applied to the newly 

 proposed System of voluntary Equality of Wealth. By Wm. 

 Thompson. In a thick volume 8vo, closely printed, price 145. 

 in boards. 



ANALYSIS OF PERIODICAL WORKS ON NATURAL HISTORY. 



No. II. Of The Zoological Journal has just appeared, con- 

 taining nineteen papers, of which the following are original, 

 or have original notes appended to them. — Continuation of 

 Mr. Gray's Monograph on the Cyprceidce, with a coloured En- 

 graving. — Mr. French On Instinct, Essay II. containing an 

 Examination of the Views of that Subject taken by Dr. Fle- 

 ming and M. Frederic Cuvier. — Continuation of Mr. Bell's 

 Translation of Gaspard On Helix Pomatia. — Some Observa- 

 tions on the Nomenclature of Ornithology ,• particularly "with 

 reference to the admission of New Genera. By N. A. Vigors, 

 jun. Esq. A.M. F.L.S. — Remarks on the Animal Nature of 

 Sponges. By Mr. Bell. — Conchological Observations, being an 

 Attempt to fix the Study of Conchology on a firm Basis. By Mr. 

 J. E. Gray, M.G.S. — Note on the supposed Identity of the Ge- 

 nus Isodon of Say with Capromys. By Mr. Bell. — A Revision 

 of the Family Equidce. By Mr. Gray. Mr. Gray divides the 

 family EquidfE into the two genera Equus and Asinus, de- 

 scribing the Equus Zebra of Burchell, as Asinus Burchellii : 

 A. albidus, nucha dorsoque fasciis alternis nigris et fuscis, ni- 

 gris latioribus, linea dorsali nigra albido-marginatis ; ventre, 

 cauda, artubusque infasciatis. A plate is given, showing the 

 animal itself, and also the difference between its hoof and that 

 of the Equus montanus of Burchell, which is the true zebra. 

 — Description of two new Species of Helicina ,■ also by Mr. 

 Grey. — Description of a remarkable Fossil found in Coal Shale. 

 By Mr. J. D. C. Sowerby. — On the Structure of Melania setosa. 

 By Mr. Gray. — Abstract of a Monograph on a new Genus of 

 Gasteropodous Mollusca, named Scissinella ; by M. D. Or- 

 bigny. With Notes by Mr. G. B. Sowerby. There are four 

 plates besides those already mentioned ; one of them lithogra- 

 phic : their subjects are, Helicinae, Baleas, Isodon pilorides, 

 Melania setosa, the fossil bone from the coal shale, Epeira 

 curvicauda, and Nyctinoinns Braziliensis. 



3 L 2 Curtis's 



