366 PROCEEDINGS OF THE ACADEMY OF [1880. 



Pecten Foulsoni, Morton. 



Ostrea (species difterent from that of Knight's Branch and 

 Cave Branch.) 



From an examination of the above tables it will be seen that a 

 fair proi)ortion of the fossils from Knight's and Cave Branches 

 are held in common by both deposits, and therefore there can be 

 no reasonable doubt that they represent about equivalent horizons. 

 Of the hitherto undescribed forms Gytherea Nuttalliojysia and Lsevi- 

 huccinum lineatuvi appear to have been obtained only at the 

 former, and Pleurotoma moniliata at the latter locality, although 

 it is highly probable that further investigation will reveal their 

 mutual presence in both localities. The described American forms 

 are mainly those occurring at various heights on the Claiborne 

 exposure. A comparison of these forms with those obtained by 

 Tuomey ( First Biennial Report of the Geology of Alabama, p. 

 146) from the Basliia Creek sections near Choctaw Corner, shows 

 the two groups to be of a contemporaneous age, for from bed No. 

 2 of that section Prof Tuomej^ obtained (among others) species 

 of " Ostrea., Gytherea, Cardita^ Cardiuin, BosteUaria, Actseon. 

 Vohita, Infundibulum, and' Solarium,^'' wliich appear to have been 

 identical with the species obtained by Dr. Smith from the two 

 localities above mentioned.' 



1 The siiecies enumerated by Tuomey are Ostrea coinpressirostra, Cardita 

 planicostd, Rostelhtrla vcluta, ArtiEon po)/nHii.s, Vol nUi Say ana? Cardium 

 Nicollctl, undinfundibulfuii trochiforinis. The specimens aj^pear to have been 

 submitted to Mr. Conrad, who considered the determinations of Tuomey as, 

 at least in part, imperfect, and substituted the following specific names {Am, 

 JoxLrri. Science, new series, xl, p. 266) : Ostrea CaroUnensis (species from 

 the Santee Canal, South Carolina), Volutilithes [Athleta] Tuomeyi (de- 

 scribed by Conrad [Proc. Acad. Nat. Sciences, vi, p. 449] in 185iJ from 

 Bashia C!reek), and Protoairdiu Virginiana ? The following remark in 

 pencil occurs in the volume of Toumey's Reports, contained in the library 

 of the Academy : "All doubtful except VenericAirdia planicosta. T. A. 

 Conrad." Tuomey's Rostellaria tetata and Acta'on pomilivs were in all 

 ■pvdhahiWtY Ixostellaria trinodif era and Tornntella, bella, wliich would better 

 agree with the descriptions of obviously the same fossils as given in Hale's 

 report (C. S. Hale : The Geology of South Alabama, Am. Journ, Science, 

 new series, vi, p. 355). 



