166 LIST OF CONTRIBUTORS. 



Scott, W. B. Continued. 



The evolution of the premolar teeth in the mammals. P 



'92, 405 



A new insectivore from the White River beds. P '94, 446 



Protoptychus hatcheri, a new rodent from the Uinta Eocene. 



P '95, 269 



On some new and little known creodonts. J IX, 155 



The structure and relationship of Ancodus. J IX, 461 



The osteology of Hysenodon. J IX, 499 



Scribner, F. Lamson. Observations on the genus Cinna, with 

 description of a new species. P '84, 289 



A revision of the North American Melica?. P '85, 40 



Mexican grasses. P '91, 292 



Scudder, Sam 'l. H. New genera and species of fossil cockroaches 

 from the older American rocks. P '85, 34 



Notes on Mesozoic cockroaches. P '85, 105 



Seale, Alvin. Notes on Alaskan water birds. P '98, 126 

 Sellers, Coleman. Description of machine for grinding sections 



of hard substances for microscopic purposes. P '69, Biol. 11 

 Seybert, Henry. Analysis of American minerals. J ii, 139 

 Sharp, Benjamin. On the anatomy o-f Ancylus fluviatilis 0. F. 



Muller and Ancylus lacustris Oeoffroy. P '83, 214 



On visual organs in Solen. P '83, 248 



Visual organs of lamellibranchs. P '84, 10 



On Semper 's method of making dried preparations. P '84, 24 



Homologies of the vertebrate crystalline lens. P '84, 300 



On the eye of Pecten. P '86, 61 



Fermentation in Perenji 's fluid. P '86, 61 



On the expansion of the crystalline lens. P '86, 277 



Ctenophores in fresh water. P '88, 82 



Remarks on the phylogeny of the Lamellibranchiata. P 



'88, 121 



Activity in Donax. P '89, 347 



Change of habit causing change of structure. P '89, 347 



Variations in Bulimus exilis. P '90, 148 



Remarks on the exuvias of snakes. P '90, 149 



An account of the Vincelonian volcano. P '90, 289 



On a probable new species of Bipalium. P '91, 120 



On Hippa emerita. P '92, 327 



Catalogue of the crustaceans in the museum of the Academy 



of Natural Sciences of Philadelphia. P '93, 104 



