128 EOCENE AND LOWER OLIGOCENE CORAL FAUNAS, 



Locality. — Peach Tree Landing-, Alabama River, Alabama. 

 Horizon. — Greggs Landing, Chickasawan stage. 

 Type. — Wagner Free Institute of" Science. 



T'amily STYLOPHORID^E Zittel (snbfaixi. IVI.-EcIav. and H.). 



Genus MADRACIS Milne-Edwards and Haiine. 



Madracis ganei sp. nov. 



PI. XIII, figs. 1 to 7. 



189G. atylophora n. sp. Vaugban. BulL TJ. S. Geol. Survey No. 142, p. 49. 



Colony branching-; branches approximately circular in cross section; 

 diameter of branches from 5 to 14 mm. Surface between calices rough, 

 granular; no costse. Calices shallow, subcircular, or elliptical, small; diameter 

 about 2 mm.; usually about 2 mm. apart, margins very slightly elevated. 

 Septa usually ten, which reach the columella; a variable number of smaller 

 septa; thicker at the corallite wall, slightly exsert; sides minutely and 

 in-egularly granulate. Dissepiments abv;ndant. Columella stout, styliform, 

 below the projecting point very thick. The axes of the colonies are spongy, 

 but l)etween the central spongy axis of a colony and the bottoms of the 

 calices the corallites are almost entirely filled with dense, solid, internal cal- 

 careous deposit. 



Locality. — Natcliitoclies, Louisiana. 



Geologic occurrence LoWer Claibome. 



Types. — United States National Museum. 



Named in lionor of Dr. H. S. Gane. 



The following gives some of the minute details of this species, and, for 

 purposes of comparison, some notes on the recent West Indian Madracis 

 decactis (Lymau) and Madracis mircdnlis (Duchassaiug and Michelotti): 



This species agrees in every essential character with Madracis mirahilis 

 of Duch. and Mich, and witli Madracis decactis of Lyman — all of which agree 

 with the orio-inal characterization of the g-enus. 



In the cross section of a, corallite of M. ganei a styliform columella can 

 be seen between the thick and inner ends of the septa and the calcareous 

 deposits that surround them. The columella probal)ly has been broken 

 out of those calices that seem to contain none, or rather which seem to 

 possess only a false one. Quite often a single dissepiment is seen in the 

 cross section of one interseptal loculus. The wall appears to belong to that 

 t}'pe known as a true theca. The septal margins are finely dentate. As 



