226 Tertiary. 



Pliocene of the Niobrara river, Merychochcerus rusticus ; from Dry 

 creek, Stanislaus county, California, Mastodon sheioardi ; and from 

 Tuolumne county, Auchenia californica. 



Prof. O. C. Marsh* described, from the Eocene of New Jersey, The- 

 cachampsa ininor; from the Miocene of Edgecombe county, North Car- 

 olina,t Catarractes antiqaus; from Maryland, Puffinus conradi; from 

 the Niobrara river, Orus haydeni, Oraculiis idahensis; from Squan- 

 kum. New Jersey,^ Hhinoceros matutinus; from Shark river, Dicotyles 

 antiquus; and from the Pliocene at Monmouth, 3Ieleagris altus. 



Prof. F. B, Meek described, from the Miocene, at Fossil Hill, Hot 

 Spring mountains, Idaho, Sphcerium rugosum, S. idahoense, Ancylus 

 undulatus, ^Gonlohasis sciclptilis, G. suhsculptilis^ Carinifex binneyi, C. 

 concava and C. tryoni. 



T. A. Conrad§ described, from the Miocene of Virginia and South 

 Carolina, Artena iindulata., Crepidula rostrata, C. recurvirostra, C. 

 virginica, Persicula ovula, and Axincea bella. 



The Grand Gulf Group of Louisiana! consists of nonfossiliferous 

 clays and sandstones prett}' regularl}^ stratified, varied, occasionally, by 

 clayey sand and beds containing twigs and leaves. The sandstone oc- 

 curs in ledges from six inches to 20 feet in thickness. It is cut into 

 four parts bj' the bluff and the alluvion of Red river and the Missis- 

 sippi. One reaches the Vicksburg area and extends into Missis- 

 sippi; another is southwest of Red river and extends into Texas; an- 

 other is northeast of Red river as far as Sicily Island on the Ouachita; 

 and the other is at the western part of the Avoyelles prairies. 



In 1871, T. A. Conrad^ described, from the Eocene at Claiborne, 

 Alabama, Garyatis exigua ; and from the Oligocene at Vicksburg, 

 Mississippi, Macoma siihlintea, and Ahra protexta. 



F. B. Meek** described, from the Bridger Eocene at Henry's Fork, 

 Black's Fork, and Church buttes, Wyoming, Viviparus wyomingensis. 



Brady and Crosskeyf f described, from the Post- pliocene of Port- 

 land and Saco, Maine, and from Montreal, Canada, Cythere mac- 

 chesneyi, C. logani, C. cuspidata, Cytherura cristata, C. granulosa^ 

 and Cytheropteron complauatum. 



* Am. Jowr. Sci. and Arts, 2d series, vol. 50. 



■{• Ibid, vol. xlix. 



X Proc. Acad. Nat. Sci. 



5 Am. Jour. Conch., vol. vi. 



II Geo. of Lou., 1871. 



IT Am. Jour. Conch., vol. vi. 



*•'■' Proc. Acad. Nat. Sci. 



tf Lond. Geo. Mag., vol. viii. 



