468 BULLETIN 5:5, UNITED STATES NATIONAL MUSEUM. 



18597. Ostrea compressirostra vSa\'. Plesiotypes. 



Eocene. Maryland. 



White, Fourth Ann. Rept. U. S. Geo!. Surv., 18S4, p. 309, pi. 65, 

 figs. I, 2. 



238. Ostrea congesta Conrad. Plesiotypes. 



Niobrara (Cret.j. Mis.soiiri River, near Niobrara, 

 Nebraska. 



Meek, Rept. V. S. Geol. vSurv. Terr., IX, 1876, p. 13, pi. 9, figs, 

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

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

 Surv., 1S93, p. 55, pi. 2, figs. 2-4. 



9904. Ostrea contracta Conrad. Cotj'pes. 



Miocene. Oyster Point, Mexico. 



Conrad, Re])t. U. S. Mexican Bound. vSurv., Emorj^ I, Tt. II, 1857, 

 p. i6(j, pi. iS, figs, a-d. 



9S71. Ostrea cortex Conrad. Cotypes. 



Cretaceous. Dry Creek, Mexico. 



Conrad, Rept. U. S. Mexican Bound. Surv., Emory, I, Pt. II, 1857, 

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

 Geol. vSurv., 1884, p. 294, pi. 37, figs. 3, 4. 



8642. Ostrea cortex Conrad. Plesiot3'pes. 



Cretaceous. Colob Plateati, southwest of Kanara, Utah. 



White, Rept. l'. S. (reogr. vSurv. W. looth Merid., IV, Pt. I, 1S76, 

 p. 1711, pi. 15, figs. 2a-c. 



= Ostrea soleni.sctis. 



20253. Ostrea cretacea Morton. Cotypes. 



Lower Cretaceous. Hemp.stead County, Arkansas. 



Owen, vSecond Rej)t. Geol. Reconn. Arkan.sas, i860, pi. 7, figs. 



= Ostrea franklini. 



201 1 1. Ostrea fAlectryonia ) dilleri White. Cotypes. 



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

 County, California. 



White, lUill. No. 51, U. vS. Geol. vSurv., 1889, p. 14, \A. i, figs. 1,2; 

 pi. 2, figs. I., 2. 



8300. Ostrea diluviana Linnccus. Plesiotypes. 



Cretaceous. Bell Comity, Texas. 



White, I'ourth Ann. Rept. U. vS. Geol. Surv., 1884, p. 295, ])1. 40, 

 fig. I ; pi. 1 1 , iigs. I, 2. 



18611. Ostrea elegantula Newberry. Cotypes. 



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



Newberry, Re])t. hlxj^l. I<;xi)ed. Santa ]'<j to junction of Grand 

 and Green Riv., Maconih, 1876, ]). 33. — While, I'ourth Ann. 

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



