GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 461 



The young calices, of course, are smaller. 



Distance apart 7 to 20 mm. Isolated calices may be decidedly 

 prominent, 5 mm. or more in height. Depth, moderate. 



The corallites externally are strongly costate; large, tall, thin 

 costae alternate with much smaller ones. The intercostal spaces 

 wider than the costae. Wall mostly dissepimental, but there are 

 some synapticulae with intervening perforations similar to those in 

 C. rochettina. 



Septa in the larger calices between 70 and 80, the various systems 

 and cycles are not distinctly differentiated, about 24 reach the 

 columella. Within the wall the septa are thin, in the thecal ring 

 they are thicker; the costae are thicker than the inner portions of the 

 septa. Pali before the members of the first three cycles of septa. 

 Both synapticulae and dissepiments present. 



Columella large, composed of twisted, interlacing, fused inner ends 

 of septa. Its diameter about one-third the diameter of the calice. 



Localities and geologic occurrence. — Island of Anguilla, West Indies, 

 collected b}^ P. T. Cleve; station 6969cr, bottom bed, Road Bay, 

 Anguilla, collected by T. W. Vaughan. 



A specimen from station 7509, west of Ocujal Spring, conglomerate 

 boulder on hill of limestone conglomerate, near Guantanamo, 

 Cuba, collected by O. E. Meinzer, seems to be referable to this species; 

 it is a large calicled species of Cyathomorpha, and I have found no 

 -differences between it and C. anguillensis. 



Type. — University of Upsala (pi. 127, fig. 1); 4 specimens in the 

 United States National Museum. 



Three specimens belonging to the University of Upsala collection 

 are typical, although they show some variation. Four other speci- 

 mens show gradual decrease in both the size and prominence of the 

 calice. These four specimens are figures on plate 127, figures 2, 3, 

 4, 5. With them before one it does not seem possible to separate 

 sharply the large and prominent caliced specimens from those with 

 smaller (7 mm. diameter) and only slightly prominent calices. 



The specimens with smaller, less prominent calices closely resemble 

 the specimens described below under the name C. roxboroughi. 



CYATHOMORPHA ROXBOROUGHI, new species. 



Plate 129, figs. 1, la, 16. 



Corallum massive, usually rather broadly and obtusely conical in 

 shape. Type — greater diameter of base, 111 mm.; lesser diameter 

 of base, 73 mm. ; height, 103 mm. The rather large difference in the 

 basal diameters is probably in part due to compression. A paratype 

 has a greater basal diameter of 121 mm.; lesser basal diameter, 

 108 mm.; height, 96 mm. Base without calices; apparently some 



