GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 349 



by a small raised, granulated line. The distal ends of the septa are 

 produced as short costae to this line and often a granulation occurs 

 between each pair of costae. The diameter of the corallites ranges 

 from 1.5 to 2.5 mm. ; about 2 mm. is the average. Calices shallow. 



Septa distant, normally 16 in number, of which 8 extend to the 

 columella, occasionally 20, with 10 reaching the columella. Their 

 outer ends are slightly prominent on the wall and are equal in size. 

 The inner margins lie almost in a straight line or are very slightly 

 excavated but are regularly finely dentate, with four to seven teeth 

 to each septum. These teeth are moderately acute and are directly 

 obliquely upward and inward. Granulations on the faces minute, 

 pointed. 



Endothecal dissepiments present, thin, not abundant. 



Columella a strong style, upper end pointed but not very promi- 

 nent. There is some thickening of the inner ends of the larger septa 

 where they fuse to the columella. 



Localities and geologic occurrence.'- — Georgia, station 3383, Hale's 

 Landing on Flint River, 7 miles below Bainbridge; and station 3381, 

 Blue Springs, 4 miles below Bainbridge, collected by T. W. Vaughan. 



Island of Antigua, West Indies, in the Antigua formation, collected 

 by Robert T. Hill. 



Cuba, station 7523, south side of Mogote Peak, altitude 250 feet 

 a. t., one-half mile east of east boundary of the United States Naval 

 Reservation, near Guantanamo, collected by O. E. Meinzer. 



Type.— Cat. No. 324789, U.S.N.M. 



Paratype.—C&t. No. 324788, U.S.N.M. 



Astrocoenia ornata Duncan from Antigua (No. 12948, coll. Geol. 

 Soc. London) is a massive species of Astrocoenia. It is silicified; the 

 corallites are crowded, polygonal, intervening walls thin, diameter of 

 corallites, 1.5 to 1.75 mm. Septa, 8 principal, 8 rudimentary, thin 

 and distant. Columella, a slender style. 



ASTROCOENIA MEINZERI, new species. 



Plate 79, figs. 3, 3a. 



Corallum composed of thick branches, with broadly elliptical cross- 

 section. Type, a broken, bifurcating branch. Length from broken 

 base to fork, 50 mm.; diameter of basal end, 23.5 by about 24 mm. 

 Diameter of broken end of branch at fork, 23 by 24 mm. Length of 

 broken lateral branch from fork, 21 mm.; diameter of distal broken 

 end, 17.5 by 20.5 mm. 



Calices rather large, diameter measured between thecal summits 

 from 2.5 to 3 mm.; depth, 1.25 to 1.5 mm. Intercorallite walls from 

 0.5 to 1.5 mm. across where well preserved, about 0.75 mm. usual. 

 In places the top of the wall is acute, but this condition is probably due 



