CAMBRIAN GEOLOGY AND PALEONTOLOGY 



II 



No. 9.— NEW YORK POTSDAM-HOYT FAUNA 



By CHARLES D. WALCOTT 



(with plates 37 to 49) 



CONTENTS PAGE 



Introduction 252 



Stratigraphic position of fauna 254 



Use of the terms Saratogan and St. Croixan 256 



Descriptions of genera and species 257 



Genus Cryptosoon Hall 257 



Cryptosoon proliferum Hall (pi. 37) 258 



Genus Climactichnites Logan (pis. 38-40) 259 



Lingiilella prima (Conrad MS.) (Hall) (pi. 41) 262 



LingulcUa (Lingulcpis) acttviiiiata (Conrad) (pi. 41) 262 



Genus Triblidium Lindstrom 263 



Triblidium conmtaforvie (Walcott) (pi. 41) 263 



Genus Matherella, new genus 263 



Mathcrclla saratogensis (Walcott) (pi. 41) 264 



Genus Palccacmcea Hall and Whitfield 264 



Palaacmcca typica Hall and Whitfield (pi. 43) 264 



Genus Matthevia Walcott 265 



Matthevia variabilis Walcott (pi. 42) 265 



Genus Hyolithes Eichwald 265 



Hyolithcs gibbosus Hall and Whitfield (pi. 43) 265 



Genus Pelagiella Matthew 266 



Pelagiella miniitissima (Walcott) (pi. 41) 266 



Pelagiella hoyti (Walcott) (pi. 41) 266 



Genus Hyolithcllus Billings 267 



Hyolithellns papillatus, new species (pi. 43) 267 



Genus Ptychoparia Corda 267 



Ptychoparia minuta (Bradley) (pi. 43) 267 



Ptychoparia matheri, new species (pi. 44) 268 



Genus Conocephalina Brogger 269 



Conocephaliua whitehallensis, new species (pi. 44) 269 



Genus Pagodia Walcott 269 



Pagodia seelyi, new species (pi. 44) 269 



Agraulos saratogensis Walcott (pi. 43) 269 



Genus Lonchocephalus Owen 270 



Lonchocephaliis calciferus (Walcott) (pi. 43) 270 



Genus Ptychaspis Hall 272 



Ptychaspis spcciosus Walcott (pi. 43) 272 



Genus Dicellocephalus Owen 273 



Dicellocephalus hartti (Walcott) (pi. 44) 273 



Dicellocephalus tribulis, new species (pi. 44) 274 



Genus Protichnites Owen 275 



Protichnites septemnotatus Owen (pis. 46, 47) 278 



Protichnites logananus Marsh (pis. 48, 49) 279 



Smithsonian Miscellaneous Collections, Vol 57, No. 9 



251 



