Geol.— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. 



41 



whole will be increased still more. In the basin of the 

 Great Valley they are especially abundant and varied, some 

 of them reaching very large dimensions. Among the very 

 large forms are Lytoceras argonaiitarmn and Ancyloceras 

 ^ercostatum. The following is a partial list of those already 

 known from the Horsetown beds of the upper Sacramento 

 Valley: — 



List of Fossil Species from Horsetown Beds. 



Acanthoceras dispar (?) (d'Orb.) Stol. 

 AdcBon impressus Gabb 

 Anchiira sp. 



Ancyloceras lineatum Gabb 

 Ancyloceras remondi Gabb 

 Anisoniyon meeki Gabb 

 Archoinya undidata Gabb 

 Avicula mucronata Meek 

 Avicula whiteavesi Stanton 

 Belemtiites impressus Gabb 

 Beleimntes sp. 

 Chiotie varians Gabb 

 Crioceras latum Gabb 

 Crioceras percostatum, Gabb 

 Cucullcza truncata Gabb 

 Cumlia sp. 



Desmoceras betcdanti Brong. 

 Desmoceras breweri Gabb 

 Desmoceras colusaense, sp. nov. 

 Desmoceras dilleri, sp. nov. 

 Desmoceras haydeni Gabb 

 Desmoceras hoffmanni Gabb 

 Desmoceras lecontei, sp. nov. 

 Desmoceras merriami, sp. nov. 

 Desmoceras subquadratum, sp. nov. 

 Desmoceras voyi, sp. nov. 

 Diptychoceras Iceve Gabb 

 Douz'illiceras mamillare Schloth. 

 Eriphyla sp. 



Eripachya hoffmanni Gabb 

 Eripachya perforata Gabb 

 Exogyra parasitica Gabb 

 Fusus aratus Gabb 

 Hehcancylus cequicostatus Gabb 

 Helicaidax bicaritiata Gabb 

 Holcodiscus re\.H. theobaldianus Sioi. 

 Hoplites remofidi Gabb 

 Inoceramus sp. 

 Lima microtis Gabb 

 Lima shastensis Gabb 



Liocium punctatum Gabb 

 Lunatia avellajta Gabb 

 Lytoceras angtilatum, sp. nov. 

 Lytoceras argonautaru)n, sp. nov. 

 Lytoceras batesi Trask. 

 Lytoceras sacya Forbes 

 Lytoceras x^. L. sacya 

 Lytoceras timotheanum May. 

 Meekia sella Gabb 

 Nautilus gabbi, sp. nov. 

 Nautilus suciaensis, sp. nov. 

 Neithea grandicosta Gabb 

 Nemodon vancouverense Meek 

 Nerinea dispar Gabb 

 Nerinea maudensis Whiteaves 

 Nerita deformis Gabb 

 Olcostephattus traski Gabb 

 Olcostephanus sp. 

 Ostrea sp. 



Oxytoma mucronata Whiteaves 

 Pachydiscus sacramenticus, sp. nov. 

 Pecten opercidiforjnis Gabb 

 Pinna sp. 



Pleuromya IcBvigata Whiteaves 

 Pleuromya papyracea Gabb 

 Plicatula varia Gabb 

 Phylloceras onoense Stanton 

 Phylloceras shastalense, sp. nov. 

 Potamides diadema Gabb 

 Ptiloteuthis foliatus Gabb 

 Ringinella polita Gabb 

 Scalaria albensis (?) d'Orb. 

 Schlcenbachia inflata Sowerbv. 

 Sonnertia stantoni, sp. nov. 

 Thetis elofigata Gabb 

 , Trigonia czqicicostata Gabb 

 Trigofda evansana Meek 

 Trigonia rel. T. evansana Stanton 

 Trigonia leana Gabb 

 Turnus plenus Gabb 



