DISTRIBUTION OF SPECIES. 25 



EOCENE. 

 MIDWAYAN STAGE. 



Midway beds. — The spccIes wliicli I have seen belonging to this horizon all 

 come from one locahty, or from the same vicinity — Prairie Creek, Wilcox 

 County, Alabama. 



There are eight species referred to these beds: 



Oculina(?) smithi Vaugban. Siderastrea hexagonalis Vaughan. 



Dicboccpiiia alabamensis Vaugban. Mesoinorpba duucani Vauglian. 



Haimesiastra^a conferta Vangbau. Balanopbyllia poiiderosa Vaugban. 



StepLanoiuorpba niouticuliformis Astraugia wilcoxeusis Vaugban. 

 Vaugban. 



The two following species also are doubtfully referred to them : 



Paracyatbus cylindricus Vaugban. Trochocyatbus cingulatus Vaughan. 



Dichocoenia and Siderastrea are exclusively shallow-water genera; 

 HaimesiastrjEa, Stephanomorpha, and Mesomorpha are shallow-water types 

 of corals; Oculina lives at a depth of 50 fathoms or less, and Balanophyllia 

 occurs both in shallow and in moderately deep water. We may conclude 

 that the Midway beds in the vicinity of Prairie Creek were deposited in 

 water considerably less than 50 fathoms deep. 



sucarnoche-- clays and Naheoia marls. — Thcsc two liorizous are represented by only 

 two species, Flahellum conoideum Vaughan and Trochocyathus liyatti Vaughan. 



The collection is not extensive enough to warrant any general conclu- 

 sion. The water at the time of the deposition of these beds was probably 

 100 fathoms or more in depth. 



CHICKASAW AN STAGE. 



Nanafaiia Bluff beds. — Ouly oue specles, BalmiopliyUia desmophyUum M.-Edw. 

 and H. var. microcostata Vaughan, is known from these beds. This genus 

 ranges in depth from shallow water to 400 fathoms. 



Greggs Landing beds. — Scveu species are known from these beds from 



Alabama : 



Oculina alabamensis Vaugban. Balanophyllia desmopbyllum M.-Edw. 



Ccelobelia wagneriana Vaugban. and H. 



Madracis gregorioi Vaughan. Balanophyllia annularis Vaughan. 



HaimesiastriBa conferta Vaugban, Eupsammia elaborata (Conrad). 



