26 Annals of the Carnegie Museum. 



Faunal List of the Three Forks Formation. — Continued. 



MOLLUSCA. 



Pelecypoda. 



Lyriopeclen fasciatus Hall 



L. cf. solox Hall 



L. cf. polydorits Hall 



L. sp. nov.? 



Crenipecten amplus Hall 



C. glaber Hall 



Aviculopecten fasciculatus Hall 



A . cf. celsus Hall 



A. cf. princeps Hall 



Aviculopecten sp.? 



Pterinopecten imhecilis Hall 



P. vertumnus Hall 



Pterinopecten sp? 



Actinopteria hoydi Hall 



A. amiliana? = Avicula cemiliana Freeh. 



Actinopteria sp.? 



Loxopteria holzapfeli Raymond 



Loxopteria clarkei Raymond 



Leptodesma sociale? Hall 



Leptodesma sp? 



Glyptodesma cf. erectum Hall 



Mytilarca chemungensis? Conrad 



Modiomorpha sp.? 



Nucula sp.? 



Grammysia subarcnata Hall 



Grammysia sp.? 



Goniaphora cf. hatniltonensis Hall 



G. cf. subrecta Hall 



Palceanatina sp.? 



Leda sp. ? 



Schizodus cf. appressus Hall 



Cf. Edmondia philipi Hall 



Macrodon chemungensis Hall 



Pthonia cf. cylindrica Hall 



Cf. PalcBoneilo brevis Hall 



Spathella cf. lypica Hall 



Paracyclas sp.? 



Cypricardella sp.? 



Cypricardinia sp.? 



L. JM. U 



Gastropoda. 



Phanerolinus sp.?. 



Conularida. 



Conularia sp.? . 



Nautiloidea. 



Orlhoceras monlanense Raymond 



Geisonoceras nortnale Raymond 



G. accelerans Raymond >" 



