Vol. IV] 



DICKERSON—SIPHONALIA ZONE, OREGON 



115 



FAUNAL RELATIONS. 



The fauna obtained at these two locahties is as follows 



LIST OF FOSSILS FROM THE UMPQUA FORMATION. 



25 



24 



Barbatia morsel Gabb ; 



Cardium marysvillensis Dickerson 



Cardium breweri Gabb 



Crassatellites semidentata Cooper 



Crassatellites washingtoniana Weaver 



Corbula parilis Gabb 



Corbula hornii Gabb 



Dosinia, species 



Glycimeris sagitata Gabb 



Glycimeris eocenica Weaver 



Lucina( ?) cretacea Gabb 



Modiolus ornatus (Gabb) 



Meretrix hornii Gabb 



Meretrix ovalis Gabb 



Macrocallista conradiana (Gabb) 



Psammobia equalis (Gabb) 



Pitaria martini, new species 



Ostrea idriaensis Gabb 



Tivela weaveri, new species 



Venericardia planicosta merriami, new subspecies. 



Venus aequilateralis Gabb 



Amauropsis andersoni, new species 



Amauropsis alveata Gabb 



Amauropsis umpquaensis, new species 



Ancilla (Oliverato) calif ornica Cooper 



Caricella stormsiana Dickerson 



Cerithiopsis alternata Gabb 



Cassidaria twberculata (Gabb) 



Clavella, species 



CalyptrcBa excentrica (Gabb) 



Cylichna costata Gabb 



Chrysodomus martini Dickerson 



Dentalium, species 



Ficopsis remondii Gabb 



Ficopsis cooperi Gabb 



Loxotrema turrita Gabb 



Natica hannibali, new species 



Neverita nuciformis Gabb 



Neverita secta Gabb 



Neverita globosa Gabb 



Olivella mathewsonii Gabb 



Potamides carbonicola Cooper 



Pseudoliva dilleri, new species 



Rimella canalifera Gabb 



Siphonalia suiterensis Dickerson 



Surcula davisiana (Cooper) 



Tritonium hornii Gabb 



Turritella uvasana Gabb 



Turritella merriami Dickerson 



Turris suturalis (Cooper) 



X 



