TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 385 



13310. Mactra ? gaviotensis Conrad. Holotype. 



Miocene. Gaviote Pass, California. 



Conrad, Rept. Bxpl. and Surv. R. R. Miss. Riv. to Pacific Ocean, 

 VII, 1857, p. 194, pi. 7, fig. 4. 



297. Mactra gracilis Meek and Hayden. Holotype and paratypes. 

 Montana (Cret.). Yellowstone River, Montana. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila., for i860, p. 179. 



297. Mactra (Cymbophora ?) gracilis (Meek and Hayden). 



Holotype and paratypes. 

 Montana (Cret.). Yellowstone River, near Miles City, 

 Montana. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 209, pi. 17, figs. 

 18a, 18b. 



7840. Mactra ? holmesi (Meek). Holotype, paratypes, and 



8088. plesiotypes. 



Fox Hills (Cret.). About four miles north of Golden 

 City, and near Canyon City, Colorado. 



White, Eleventh Ann. Rept. U. S. Geol. Surv. Terr., 1879, p. 295, 

 pi. 6, figs. 5a, 5b, 4a, 4b. 



See Cyrena holrnesi. 



22904. Mactra huerfanensis Stanton. Cotypes. 



Colorado (Cret.). Huerfano Park, Colorado. 



Stanton, Bull. No. 106, U. S. Geol. Surv., 1893, p. 122, pi. 27, 

 figs. 14, 15. 



8636. Mactra ? incompta White. Holotype. 



Colorado (Cret.). Five miles above Pueblo, Colorado. 



White, Rept. U. S. Geogr. Surv. W. 100th Merid., IV, Pt. I, 1876, 

 p. 185, pi. 17, figs. 6a, b. 



1913. Mactra (Cymbophora ?) nitidula (Meek and Hayden). 



Holotype and paratype. 

 Fox Hills (Cret.). Deer Creek, near North Platte, 

 Wyoming. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1S76, p. 211, pi. 30, figs. 

 6a-c. 



See Tellina nitidula. 



207. Mactra siouxensis Meek and Hayden. Cotypes and 



plastotypes. 

 Dakota (Cret.). Big Sioux River, two miles ab6ve its 

 mouth, South Dakota. 

 Meek and Hayden, Proc. Acad. Nat. Sci. Phila., for 1S61, p. 179. 

 = Mactra (Cymbophora?) siouxensis. 

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