468 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



18597. Ostrea compressirostra Say. Plesiotypes. 



Eocene. Maryland. 



White, Fourth Ann. Rept. U. S. Geol. Surv., 1S84, p. 309, pi. 65, 

 figs. 1, 2. 



238. Ostrea congesta Conrad. Plesiotypes. 



Niobrara (Cret.). Missouri River, near Niobrara, 

 Nebraska. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1S76, p. 13, pi. 9, figs, 

 ia-e. — White, Fourth Ann. Rept. U. S. Geol. Surv., 1884, p. 

 294, pi. 39, figs. 11-13. — Stanton, Bull. No. 106, U. S. Geol. 

 Surv., 1893, P- 55, pl- 2, figs. 2-4. 



9904. Ostrea contracta Conrad. Cotypes. 



Miocene. Oyster Point, Mexico. 



Conrad, Rept. U. S. Mexican Bound. Surv., Emory I, Pt. II, 1S57, 

 p. 160, pl. iS, figs, a-d. 



9871. Ostrea cortex Conrad. Cotypes. 



Cretaceous. Dry Creek, Mexico. 



Conrad, Rept. U. S. Mexican Bound. Surv., Emory, I, Pt. II, 1S57, 

 p. 157, pl. 11, figs. 4a-d. — White, Fourth Ann. Rept. U. S. 

 Geol. Surv., 1884, p. 294, pl. 37, figs. 3, 4. 



8642. Ostrea cortex Conrad. Plesiotypes. 



Cretaceous. Colob Plateau, southwest of Kanara, Utah. 



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

 p. 170, pl. 15, figs. 2a-c. 



= Ostrea soleniscus. 



20253. Ostrea cretacea Morton. Cotypes. 



Lower Cretaceous. Hempstead County, Arkansas. 



Owen, Second Rept. Geol. Reconu. Arkansas, i860, pl. 7, figs. 



3 a > 3 b - 

 = Ostrea franklini. 



201 1 1. Ostrea (Alectryonia) dilleri White. Cotypes. 



Chico (Cret.). Near Falls of Clover Creek, Shasta 

 County, California. 



White, Bull. No. 51, U. S. Geol. Surv.; 1889, p. 14, pl. 1, figs. 1, 2; 

 pl. 2, figs. 1, 2. 



8300. Ostrea diluviana Linnaeus. Plesiotypes. 



Cretaceous. Bell County, Texas. 



White, Fourth Ann. Rept. PT. S. Geol. Surv., 1884, p. 295, pl. 40, 

 fig. 1; pl. 41, figs. 1, 2. 



18611. Ostrea elegantula Newberry. Cotypes. 



Colorado (Cret. ). Canadian River, New Mexico. 



Newberry, Rept. Expl. Exped. Santa Fe to junction of Grand 

 and Green Riv., Macomb, 1876, p. 33. — White, Fourth Ann. 

 Rept. U. S. Geol. Surv., p. 295, pl. 36, figs. 5-7. 



