1922] Trash: The Briones Formation of Middle California 143 



Complete List of Known Species from the Briones Formation with 

 their Geologic Eange — • {Concluded) 



g 2 Pi a Ph 



m a P .2 a 



Gastropoda — (Continued) o S S m o5 



Astralium raymondi Clark x x 



Calliostoma obliquistriata, n. sp x 



Calyptraea filosa (Gabb) x x x 



Cancellaria cf. condoni Anderson x x 



Cancellaria pabloensis Clark x x 



Cancellaria cf. wynoothchensis Weaver x x — 



Cerithium, sp x 



Chrysodomus cf. cierboensis Clark x x 



Chrysodomus imperialis Dall x x 



Crepidula praerupta Conrad x x x 



Ficus rodeoensis English x 



Ficus stanfordensis Arnold x x 



Fissurella, sp x 



Fusinus, sp x 



Koilopleura sinuata (Gabb) ■ .... x 



Nassa whitneyi, n. sp x? x 



Natica arnoldi Clark x x 



Natica kirkensis Clark X X 



Natica pabloensis Clark x x 



Oliva simondsi, n. sp .... x 



Olivella cf. pedroana (Conrad) x x x 



Sinum trigenarium, n. sp x 



Siphonalia rodeoensis, n. sp x 



Thais cf. lima Martyn x x x 



Trophon daviesi, n. sp x 



Trophon gracilis clarki, n. nom x x 



Turris, sp. a x 



Turris, sp. b X 



Scaphopoda 



Dentalium, sp x 



Elasmobranciiii 



Spine and teeth X 



STATISTICAL SUMMARY OF FAUNAL LIST 



Species 



Echinodermata 3 



Bryozoa _ 1 



Pelecypoda 56 ' 



Gastropoda 11 : 29 



Scaphopoda 1 



Arthropoda 3 



Elasmobranchii 1 



Total number of species 94 



11 Acanthina perrini, n. sp., is omitted from the summary as it is found in beds 

 which are questionably correlated with the Briones. 



