108 EOCENE AND LOWER OLIGOCENE CORAL FAUNAS. 



Pabacyathus bellus sp. nov. 

 PI. \ail, figs. Ki to 20. 



1895. Par acyathus bellus Vaugban uom. nud. Am. (xeol., Vol. XV, p. 217. 



1896. Paravyathus bellus Vaughau uom. nud. Bull. U. S. Geol. Survey No. 142, p. 19. 



Form rather elongate, slightly eur^'ed, attached by a rather broad 

 base, cross section nearly circular, enlarging very little in diameter with 

 increasing height. Costse corresponding to all cycles of septa, no noticeable 

 alternation in size. Along' the summit of each costa there is a singfle row of 

 regular g-ranules. Intercostal furrows narrow. Epitheca rudimentary, 

 occasional slu'eds or bauds girdling the corallum. Wall not verv thick. 

 The number of septa varies from 24 t(i 36 ; the latter seems the usual num- 

 ber. Sides of the septa densely graimlate, the granules elongated and 

 disposed in curves parallel to the septal margins. Pali before all of the 

 septa except those ol" the last cycle. Seen from above they are very diffi- 

 cult to distinguish from the papillate surface of the columella. They are 

 small, slender, weak, with granulations similar to tliose on the se})ta. 

 Columella fascicular, its upper surface papillate. Calice shallow. 



Localities. — EuterpHse, Newton, and Wautubbee, Mississippi; 2 miles 

 southeast of Hickory, Newton County, Mississipj)!; 8 miles south of Hickory, 

 Clarke County, Mississippi; 8 miles west of Enterprise, Mississippi; 1 mile 

 south of Hickory, Mississippi; 4 J miles east of Newton, Mississip|)i; 10 

 miles northwest of Wintield, Louisiana; St. Maurice, Louisiana. 



Geologic occurrence. — Lowcr Claibome. 



Types. — From collection of T. H. Aldricli in the United States National 

 Museum. 



Specimens. — United States National Museum. 



The wall ap])arently is formed by the distal fusion of the septa. 

 The fusion is not always complete, so perforations in the Avail are quite 

 frequent. The septal structure is identical with that of F. alternatm, 

 excepting the presence of many pseudosynapticulse. The septa are crowded 



