DESCRIPTIONS OF SPECIES. 89 



ment the rudiinentaiy costai disappear. The primary and secondary cost?e 

 seem to continue to the apex of the base. All of the costse are rather com- 

 pressed ; their margins are entire and smooth. The intercostal furrows are 

 perforated. The wall is rather thin. Septa 24, in three cycles, six systems, 

 somewhat exsert, faces undulated, granular. 



The ornamentation of the sides of the septa is of the same type as in 

 T. jiharetra, but shows very important differences in the minor details. The 

 first difference is that the ornamentation of T. wautuhbeensis is less regular. 

 The rows of granules on the outer portion of the septum slope downward 

 and inward, but extend more than halfway across the septal face. In the 

 rows the granules are not so absolutely regular as in T. ■pharetra. Another 

 difference is that the transverse undulations of the septa are less pronounced 

 than in T. pharetra. A close examination of the margin of a septum showed 

 that the granular arrangement, and by inference the trabecular constitution 

 of the septa, is of the same general type as all the preceding corals here 

 discussed. The granules are formed in curves parallel to the upper septal 

 margins. On the inside of the wall corresponding to the highest point in 

 the arch of the septal margin there seems to be an area of divergence. The 

 outward-directed granules can be seen distinctly only at the septal margin. 

 The columella projects far above the corallum wall ; presents a star-shaped 

 outline when seen from above. Diameter, 4 mm. ; height, 9 mm. ; columella 

 projects 1 mm. above the corallum wall. 



Localities. — Wautubbee, Mississippi; Claiborne, Alabama (Lisbon hori- 

 zon); Holstun's, 5 miles southeast of Gibbsland, Louisiana. 



Geologic occurrence. — Lower Claibome. 



Types. — PI. VI, iig.s. 11 to lib, from collection of T. H. Aldrich in 

 the United States National Museum; PI. VI, fig. 12, from United States 

 National Museum. 



TuBBiNOLiA ACUTicosTATA Vaughan. 



PI. VI, figs. 13 to 13b. 



1895. Turbinolia acuticostata Vaughan. Johns Hopkins Univ. Circ, Vol. XV, No. 



121, p. 6. 



1896. Turbinolia acuticostata Vaughan. Bull. U. S. Geol. Survey No. 1-il, p. 89. 

 Conical in shape, as is usual in the genus. Size small. Costse tall and 



thin, with crenate margins. Beginning with 6, 6 additional cost?e are soon 



