DESCRIPTION OF SPECIES 



CLASS ANTHOZOA 

 Subclass Tetracoralla 

 family zaphrentidie 

 Zaphrentis parsonsensis, n. sp. 

 Plate I, figs. I, 2 

 Description: Corallite very large, simple, conical, straight, 

 expanding uniformly and rapidly. Apical angle about 60°, so 

 that the diameter of the calyx equals its height. Septa about 

 120 in number where the diameter of the calyx is 70 mm., alter- 

 nating long and short. The type specimen is a natural cast which 

 does not show the tabulae, and they were probably not strongly 

 developed. The length of the septa in the upper part of the cup 

 is not shown, but in its basal portion the longer septa reach the 

 center, where they are twisted into a pseudocolumella. 

 Dimensions: Length, 90 mm. ; diameter of calyx, 90 mm. 

 Occurrence: A single specimen, the type, was found in the 

 Harriman chert on Harriman Creek, near Parsons. 



Subclass Tabulata 

 family favositid^ 

 Favosites foerstei, n. sp. 

 Plate I, figs. 3, 4 

 Description: Corallum subhemispherical, the convex base cov- 

 ered with a thick and concentrically wrinkled epitheca which 

 covers all but the youngest corallites. Upper surface, in the 

 fossil condition, flat or concave. At the center of the base is a 

 small point of attachment about which the corallum is symmetri- 

 cally developed. The prismatic corallites arise from an unde- 

 fined central axis and quickly bend outward into a horizontal 

 position, which they maintain to the periphery. The corallites 

 vary in diameter from 1.5 mm. to 3.2 mm. at the surface, but the 

 majority measure about 2.3 mm. Each side of a corallite bears 

 two vertical rows of round mural pores, of which a row of ten 



