﻿[275] 



VIII. — Descriptions of New Species of Cretaceous and Eocene Fossils of Mississippi 



and Alabama. 



By T. A. Conrad. 



A series of Cretaceous fossils from Barbour Co., Alabama, collected by the late 

 Mr. Tuomey, Geologist of that State, has been referred to me for examination. 

 There are several species which appear to be unpublished and are herein described, 

 together with others from Tippah Co., Mississippi, collected by Dr. Spillman, and 

 which are evidently synchronous with those from Eufaula, Alabama. I had at first 

 supposed this remarkable group of fossils to be of more recent origin than those of 

 New Jersey and Green County, Alabama, but I now find so many species common to 

 the New Jersey and Mississippi strata, that any great difference in age is not 

 indicated by organic remains. Dr. Hilgard, State Geologist of Mississippi, has 

 named the Tippah strata Upper Cretaceous, and no doubt his future researches will 

 enable him to define with accuracy their stratagraphical relation to the limestone of 

 the central counties. The North Mississippi inferior beds possess a mineral character 

 precisely like that of the Eufaula deposit, and many of the shells are common to both. 

 This marl or dark gray friable matrix has fortunately preserved the shells very 

 perfectly and enabled us to identify some of the species with the neglected and 

 obscure casts common in New Jersey. With the assistance of a young Palaeonto- 

 logist, William M. Gabb, I have compared the shells and casts, and the result is given 

 in the following list. 



Species common to the upper and lower Cretaceous Beds. 



1. Pholadomya oceidentalis, Morton, 



2. Dosinia excavata (Cytherea), ib., 



3. Fragilia elegantula (Cardium,) Eoemer, " " Texas. 



F. protexta, Conrad. 



4. Cardium Spillmani, Conrad, 



5. Trigonia thoracica, Morton, 



6. Pycnodonta vesicularis (Gryphsea,) Lam., 



7. Grervillia ensiformis, Con., 



8. Exogyra costata, Say, 



9. Pinna bicarinata, Matheron, Eufaula, 



P. laqueata, Conrad, 



TO 



ipah, 



New Jersey. 



a 



u 



a 



n 



tc 



a 



u 



u 



a 



u 



n 



k 



a 



M 



u 



U 



