LIST OF AUTHORS 



AND THEIR CONTRIBUTIONS. 



Binney, W. G. On Lingual Dentition, studied by the Mi- 

 croscope and Photography, . . . . .37 



Conrad, T. A. Descriptions of Miocene, Eocene, and Cre- 

 taceous Shells, ....... 39 



Observations on the Genus Astarte, with descriptions 

 of three other Genera of Crassatellid?e, . . 46 



Descriptions of new Fossil Mollusca, principally Cre- 

 taceous, ........ 96 



Notes on Recent Mollusca, ..... 104 



Cooper, J. G. On a new Californian Helicoid Land Shell, 196 



Notes on West Coast Land Shells, No. 2, . . 199 



Dall, ^V. H. Materials for a Monograph of the Family 



Lepetidre, ........ 140 



Gabb, W. M. Descriptions of some secondary Fossils 



from the Pacific States, ..... 5 



Notes on the Genera Alaria, Diarthema, Dicroloma, 

 &c.; being a supplement to "An Attempt at a Re- 

 vision of the Strombidse and Aporrhaidas, . . 19 

 Description of a new Helix from Utah, . . .24 

 Descriptions of new species of South American Fossils, 25 



Gill, T. On the Pterocerge of Lamarcls and their mutual 



relations, ........ 120 



