ARNOLD— THE TALEONTOLOGY AND STRATIGKAPIIY OF SAN PEDIIO. 87 



2. Caryophyllia pedroensis Vaughan, sp. nov. 



Plate in, Fios. 3 and 3a. 



Coralluni cornute, transverse calicular outline broadly elliptical. 



The outer surface of the specimen is worn, so that the detail of the ornamentation is 

 destroyed, but it can be discovered that the costae were not very prominent, and that there were 

 twelve corresponding to twelve large septa, pronouncedly larger than the others. 



The septa are in four complete cycles; the members of the first and second cycles reach 

 the columella and are rather thick, especially around the columella; those of the third are shorter 

 and thinner, and those of the fourth still smaller. The septa are not so thick as in C. arnoldi, and 

 not so crowded as in C. califomica. The septal faces are granulated, the granulations being much 

 larger and with blunt ends near the columella. All the pali except one are broken off, but they 

 appeared to exist before the twelve larger septa. The one remaining palus is broad and thin. 



Calice fairly deep. Upper surface of the columella not very deeply sunken below the level 

 of the upper edge of the pali. Columella composed of several twisted pieces. 



Dimetisiotts. — Greater diameter of calice, 13.5 mm.; lesser diameter ol calice, 12 mm.; 

 height of corallum, 25.5 mm. 



Locality. — San Pedro, California. 



Geologic Horizon. — Pleistocene. 



Type. — From the collection of Ralph Arnold. 



3. Caryophyllia californica Vaughan, sp. nov. 



Plate III, Fios. 2 and ia. 



Corallum with a narrow base, the lower half slender in comparison with the diameters at the 

 calice. The tip of the base damaged. Calice elliptical in transverse outline. 



The outer surface of the corallum is scarcely costate. There are flat, indistinct, densely 

 granulate costs corresponding to the septa, visible especially at and just below the calicular edge. 

 The wall is thin and fragile. 



There are four complete cycles of septa and many members of the fifth. They are thin and 

 crowded, twelve are larger than the others, and apparently these twelve bore pali on their inner 

 terminations. The margins of the septa of the first and second cycles project slighdy above the 

 upper edge of the wall, about i mm.; the margins of the septa of the other cycles are not prominent. 

 The septal faces are granulated, the granulations are low, frequently showing elongation along the 

 courses of the septal trabeculte ; the usual arrangement in curves parallel to the septal margins also 

 is shown. Calice fairly deep, 4.5 or 5 mm.; a distinct and rather sudden depression over the 

 columella. Columella not greatly developed, composed of a few loosely twisted laths. 



Dimensions.— Greater diameter of calice, 11.5 mm.; lesser diameter of calice, 10 mm.; height 

 of corallum, 13 mm. 



Locality. — Deadman Island, ofif San Pedro, California. 

 Geologic Horizon. — Pliocene. 



Type. — From material sent by Mr. Ralph Arnold to the U. S. National 

 Museum. 



