GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 477 



chyma between them. The diameters of five corallites are as follows : 

 ■| inch [21 mm.], § inch [17 mm.], 1 inch [25 mm.], 1-jV inches [27.5 mm.] 

 ^ inch [12.5 mm.]. Walls very indistinct. Costae small, and appear- 

 ing to be appended to all the septa. Exotheca is present and connects 

 the costae. Septa numerous, especially in large corallites, where the 

 cycles, which are small and rudimentary in the lesser, become well 

 developed. In the smallest corallites there are six systems of four 

 cycles, the fourth and eighth orders being very small. In medium- 

 sized corallites there are six systems, four cycles in five systems, and 

 in the sixth there are the rudimentary sixth, seventh, and eighth 

 orders. The first, second, and third orders are nearly equal in size. 

 In the largest there are six systems, and from twelve to fourteen 

 septa in every system. Lateral teeth exist on all the primary septa 

 at the place of greatest width. The higher orders in every system 

 are very linear. Endotheca abundant, but not in excess. Columella 

 large, well developed, and spongy. Coenenchyma formed of cells- 

 produced by the costae and the exothecal dissepiments." 



Except that Duncan failed to recognize that this is a fungid coral 

 his description is good. 



I am introducing on plate 138 figures of two specimens of this 

 variety, one specimen from Antigua (fig. 1); the other from Flint 

 River, near Bainbridge, Georgia, (figs. 2, 2a). 



Localities and geologic occurrence. — Antigua, in the Antigua forma- 

 tion, station 6881, Willoughby Bay, collected by T. W. Vaughan. 



Porto Rico, Lares road, associated with corals representing the 

 Pepino formation of Hill, collected by Bela Hubbard of the New 

 York Academy Scientific Survey of Porto Rico'. 



Cuba, station 7522, collected by O. E. Meinzer. It was stated on 

 page 476, that the fragments obtained by Mr. Meinzer on Mogote Peak 

 near Guantanamo seem referable to this variety. 



Georgia, station 3381, 4 miles below Bainbridge, Flint River, in 

 the base of the Chattahoochee formation, collected by T. W. 

 Vaughan. 



This variety has the same stratigraphic significance as the typical 

 form of the species. 



DIPLOASTREA CRASSOLAMELLATA var. NUGENTI (Duncan) Vaughan. 



Plate 138, fig. 3, 3a. 



1863. Astraea crassolamcllata var. minor Duncan, Geol. Soc. London Quart, 



Journ., vol. 19, pp. 414, 416, pi. 13, fig. 6. 

 1863. Astraea crassolamellata var. nugenti Duncan, Geol. Soc, London Quart. 



Journ., vol. 19, pp. 414, 416, pi. 13, fig. 5. 



Duncan's original description of variety nugenti is as follows: 

 "The specimen upon which this variety is founded has no calices 



