12 Cincinnati Society of Nntv/ral History. 



garis, now /. vulgaris, Crassatella vadosa, Plwladomya occidentalism, 

 Trigonia thoracica, Venilia conradi, now Veniella conradi., 

 Terehratula floridana^ Serpida harhata. Hamulus onyx, CassiduJus 

 mquoreus, Clypeaster geometricus, Flustra sagena, now Pliophlcea 

 sagena, Eschara digitata, Alveolites capularis, Turhinolia inauris and 

 Gryphoia pitclieri. The latter species was collected by Dr. Z. Pitcher, 

 on the Kiamechia, a stream which empties into the Red river, a few 

 miles above Fort Towson, when on a tour with a small militarv force, 

 marking out a road from Fort Smith to Fort Towson. Dr. Pitcher and 

 M. Jules Marcou referred the rocks to the Jurassic, and INIarcou claims 

 that the ypecies is distinct from that which abounds in the Cretaceous 

 of Texas, and farther west which is now so universally referred to this 

 species. The weight of authority, howerer, is in favor of the identity 

 of the fossils, and the Cretaceous age of the specimens described b}- Dr. 

 Morton. 



In 1835, in an appendix to his S3^nopsis of Organic Remains, he 

 separated the Cretaceous into upper, middle and lower divisions. Tn 

 the upper division he placed the Cretaceous of South Carolina, and 

 the Nummulite, or Orhitoides limestone of Alabama, which has since 

 been regarded as of Eocene age. The middle division is partially 

 seen at Wilmington, North Carolina, and to a considerable extent in 

 New Jersey. The lower division embraces the vast Ferruginous strata 

 of the Atlantic and Southern States. He enumerated the fossil species 

 which he regarded as most characteristic of these divisions, and de- 

 scribed Plagiostoma echinatum, now Spondylus echinatus. 



In 1834, Dr. Harlan described* Ichthyosaurus missiiriensis, now 

 JIosasaifTUS missuriensis. 



In 1836^ Dr. Dekay describedf Geosaurus mitchelli, now Liodon 

 mitcheUi. 



In 1838, Prof. Bronn described,^ from the greensand, 3Iosasaurus 

 dekay i. 



In 1840, Prof. Henry Rogers§ divided the Cretaceous, which is ex- 

 posed in the southern half of New Jerse3% northwest of a gentle undu- 

 lating line, drawn from Shark Inlet, on the Atlantic coast, to Salem, 

 into five separate beds, in ascending order, as follows : 



First. — A group of sands and clays, of several colors, and of some- 

 what variable constitution, but frequentl}^ of extreme whiteness and 



=•= Trans. Am. Phil. Soc, vol. 4. 

 t Ann. Lye. Nat. Hist. N. Y., vol. 3. 

 X Lethaea Geognostica. 

 g Geo. of New Jersey. 



