GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 351 



of each principal septum. Interseptal loculi about as wide as the 

 thickness of the septa. 



Columella an erect style, which does not reach the level of the upper 

 edge of the wall; its upper termination rounded; cross-section ellip- 

 tical. 



Endothecal dissepiments present. 



Localities and geologic occurrence. — Island Antigua in the Antigua 

 formation. Collected by R. T. Hill and by T. W. Vaughan. 



Porto Rico, station 3191, 4 miles west of Lares, in the Pepino forma- 

 tion, collected by R. T. Hill. 



Canal Zone, station 6024&, in the Emperador limestone, at the 

 crossing of the Panama Railway over Rio Agua Salud, collected by 

 T. W. Vaughan and D. F. MacDonald. 



Type. — No. 324785 U.S.N.M., from 4 miles west of Lares, Porto, 

 Pepino formation, collected by R. T. Hill. 



Paratype.—C&t. No. 324786, U.S.N.M. 



The foregoing description is based on the type-specimen and does 

 not take into consideration the variation of the species. I obtained 

 a good suite of specimens at two exposures of the Antigua formation 

 on the island of Antigua. The branches range in form from greatly 

 compressed to sub cylindrical (see pi. 77, figs. 1, la, illustrations of a 

 specimen from Willoughby Bay, Antigua). A segment from near 

 the base of a subcylindrical branch was collected on Rio Agua Salud, 

 Canal Zone. 



Genus STYLOCOENIA Milne Edwards and Haime. 



1849. Stylocoenia Milne Edwards and Haime, Comptes Rend., vol. 27, p. 469. 

 Type-species. — Astrea emarciata Lamarck. 



STYLOCOENIA PUMPELLYI (Vaughan). 



1900. Astrocoenia ■pumpellyi Vaughan, U. S. Geol. Survey Mon. 39, p. 149, pi. 

 17, figs. 7, la. 



This species seems to belong to the genus Stylocoenia, as it has inter- 

 corallite pillars; but as some septa show dentations on their margins, 

 the original generic identification may be correct. It occurs in the 

 base of the Chattahoochee formation, near Bainbridge, Georgia, and 

 not in Vicksburgian deposits, as I stated in the original description. 



Localities and geologic occurrence. — Georgia: Station 2326, Russell 

 Spring, Flint River, 4 miles below Bainbridge, collected by R. Pum- 

 pelly (type, Cat. No. 158315, U.S.N.M.); station 3381, same locality 

 as the preceding, collected by T. W. Vaughan; stations 3383, col- 

 lected by T. W. Vaughan, and 7078, collected by T. W. Vaughan, 

 C. W. Cooke, and W. C. Mansfield, Hales Landing, Flint River, 

 7 miles below Bainbridge, in the base of the Chattahooche formation. 



