CLASSIFICATION. 11 



Prosobranchiata according to (1) Fischer (' Manuel de Conchyliologie, &c.,' par le 

 Dr. Paul Fischer, Paris. Gasteropoda concluded February, 1886). (2) Teyon 

 (' Structural and Systematic Conchology,' by George W. Tryon, junr., Phila- 

 delphia, 1882-4). (3) Tate (Woodward's 'Manual of the Mollusca,' 4th edition, 

 with appendix by Ralph Tate, A.L.S., F.G.S., London, 1880). (4) Stoliczka 

 (' Pakeontologia Indica,' " Cretaceous Gasteropoda," by Fercl. Stoliczka, Ph.D., 

 F.G.S., Calcutta, 1868) ; and (5) Morris and Lycett (Palseontographical Society, 

 'Monograph of the Great-Oolite Mollusca,' by J. Morris, F.G.S.,and John Lycett, 

 London, 1850-4). 



