INDIANA PALEONTOLOGY. 54. 



ENALLOPH YLLUM, N. Gen. 



(Ety Enallos, changed; and Phyllon, a leaf.) 



Corallum having tabulate area with vertical walls, resembling Diphyphyl- 

 lum, and having a well developed fossette. Lanielhv occurs single or in pairs, 

 not extending farther than the vertical wall in the center of the calix. Type 

 E. Grabaui : 



E N A L L O P H Y L L U M , GRABAUI, N. Sp. 



Plate 20. Figs. 8-18. 



Corallum simple, or composite, increasing by gemmation from the superior 

 margin of the parent cup, turbinate, straight or slightly curved. Acute at the 

 point of attachment. Some examples have a broad scar at the base, some co- 

 rallums have root-like prolongations that served for attachment and support. 

 Exterior, when well preserved, exhibits numerous fine spines, distributed with- 

 out any regularity, and frequently extends some distance on the side of the 

 coral. Height varying in different individuals from ten to twenty millimeters Oj- 

 more in some examples. Calyx somewhat expanded, from eight to ten millimet- 

 ers in diameter. Depth seven or eight millimeters, walls nearly vertical. Situat- 

 ed in the center of the calyx is a vertical wall occupying one-third or slightly 

 more than the, diameter of the corallum at that point. The tabulie is smooth 

 and strongly oblique, occupying the entire inner area. Number of lamellae 

 fifty-four, in the circumference of a calix seven milimeters in diameter. Equal 

 in size, and somewhat rounded at the margin, occurring in pairs except a single 

 one that marks the continuation of the fossette, and three single ones on the 

 opposite side to the fossette. Sometimes these three lamella^ coalesce, and in 

 some examples where the cup is well preserved they are not united, the lamellae 

 extends to the vertical wall in the center of the calix, and abruptly terminates. 

 The fossette consists of a deep depression at the margin of the smooth, oblique 

 space in the center of the calix, and continues some distance on the side of the 

 coral, the positian of the fossette is variable. I have examples with the fos- 

 sette on the anterior, and others having it on the posterior side. 



Found in the Warsaw division of the St. Louis group (Sub-Carb.) at Lanes- 

 ville, Indiana. 



The specific name is in honor of Dr. Amadeus "VT. Grabau, Professor of Pale- 

 ontology in the Rensselaer Polytechnic Institute of Troy, New York, now in the 

 collection of the author. 



