PLATE XLI. 
Tertiary Turritellas. 
(All figures natural size.) 
Fig. 1. Turritella pachecoensis Stanton. U.S.N.M. 165002. Back view of imperfect 
specimen; altitude 59 mm. Eocene, Rock Creek, Los Angeles County. 
This species is supposed to be characteristic of the Martinez formation 
(lower Eocene.) 
Fig. 2. Turritella uvasana Conrad. U.S.N.M. 164974. Wax cast, back view; altitude 
41 mm. Sespe Canyon, Ventura County. Supposed to be character¬ 
istic of the Tejon formation (middle Eocene). 
Fig. 3. Turritella uvasana Conrad. U.S.N.M. 165004. Back view of imperfect speci¬ 
men; altitude 44 mm. Eocene, Rose Canyon, San Diego County. 
Fig. 4. Turtriella ineziana Conrad (-f P. hoffmanni Gabb). U.S.N.M. 164964. Lower 
Miocene, supposed equivalent of the Fourfork formation, Chaffee Can¬ 
yon, southwest of Piru, Ventura County. Supposed to be characteristic 
of the lower Miocene; found from San Mateo to San Diego counties. 
Fig. 5. Turritella ineziana Conrad. U.S.N.M. 164969. Back view of imperfect speci¬ 
men; altitude 36 mm. Tar Creek, north of Fillmore, Ventura County. 
Common in the Vaquers formation, but good specimens are hard to 
obtain. 
Fig. 6. Turritella ineziana Conrad var. sespeensis Arnold. U.S.N.M. 164970. Type. 
Aperture view of imperfect specimen; altitude 34 mm. Same locality 
as fig. 5. 
Fig. 7. Turritella ocoyana Conrad. U.S.N.M. 164990. Back view of imperfect large 
specimen; altitude 60 mm. Topanga Canyon, 3 miles south of Calabasas, 
Los Angeles County. Supposed to be characteristic of the lower Miocene. 
Common in central and southern California. 
Fig. 8. Same species and locality as fig. 7; altitude 58 mm. 
Fig. 9. Same species and locality as fig. 7; altitude 32 mm.; upper whorls. 
Fig. 10. Turritella variata Conrad, U.S.N.M. 164991. Back view of imperfect speci¬ 
men; altitude 34 mm. Same locality as fig. 7. Supposed to be charac¬ 
teristic of the lower Miocene; so far known only in Fresno County and 
south. 
Fig. 11. Same species and locality as fig. 10. Slender variety; altitude 59 mm. 
Fig. 12. Same species and locality as fig. 10. Broad variety; altitude 43 mm. 
Fig. 13. Turritella cooperi Carpenter (var.?) fernandoensis Arnold. U.S.N.M. 164957. 
Type. Aperture view of imperfect specimen; altitude 31 mm. Lower 
Pliocene, Fernando formation, Elsmere Canyon, near Newhall, Los 
Angeles County. A common form in the lower Pliocene of southern 
California. 
Fig. 14. Turritella cooperi Carpenter. Collection of Delos Arnold. Aperture view 
of typical form. Lower Pleistocene, lower San Pedro formation, Dead- 
man Island, San Pedro, Los Angeles County. Common in the Pliocene 
and lower Pleistocene from Ventura County southward. 
Fig. 15. Turritella jewetti Carpenter. Collection of Delos Arnold. Typical form, 
aperture view; altitude 70 mm. Same locality and horizon as fig. 14; 
geologic and geographic range also about the same. 
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