DESOEIPTIONS OF SPECIES. 123 



diameters of the corallites at their bases and circular margins being practi- 

 cally the same; (3) the thinness of the margins of the calices, the thin septa 

 and pali, and the lax columella. 



OCULINA ALDRICHI sp. DOV. 



PI. XII, figs. 8 aud 8a. 



The species is described from a small but excellently preserved piece 

 of a branch. 



The branch is small; does not taper i-apidly toward the end. Coenen- 

 chyma solid, .surface finely striate longitudinally, granulations not apparent. 

 Corallites in rather definite spirals, inclined toward the termination of the 

 branch, usually rise very little above the coenenchyma, occasionally as much 

 as 2 mm., scarcely constricted at the calicular margin. Distance between 

 calices on a spiral about 3 mm.; sometimes a little more or a little less. 

 Externally on the corallite wall there are low subequal costse corresponding 

 to all cycles of septa. Wall at calicular margin rather stout; diameter of 

 calices, 4 to 5 mm.; calices not very deep. Septa rather thin; usual 

 arrangement, 14 principal and as many smaller ones, i. e., three complete 

 cycles of six systems, and two members of the fourth cycle in each of the 

 half systems on the sides of the uppermost j^rimary. The tertiaries in the 

 half systems on each side of that primary usually reach the columella. 

 Members of the fifth cycle are sometimes present in the quarter systems next 

 the uppermost primary. Margins finely dentate, sides finely granulated. 

 A very few dissepiments present. Pali erect, rather slender lobes near the 

 inner terminations of the septa; they may be double. Columella poorly 

 developed, formed by the fusion of the inner terminations of the septa or of 

 septal j^rocesses. The basal portions of the corallites fill up by internal 

 secondary deposit. 



Locality. — Byrams Ferry, Mississij^pi. 



Geologic occurrence. Ecd Bluff beds. 



Type. — From collection of T. H. Aldrich in United States National 

 Museum. 



OCULINA (?) SMITHI sp. nov. 



PI. XII, figs. 10 to 11. 

 Form dendi'oid or branches coalescing to form small flabelliform 

 masses. Coenenchyma very solid. Corallites projecting .slightly or not at 

 all. On small branches arrangement in rather regular spirals; wlien the 



