104 



NORTH AMERICAN INDEX FOSSILS. 



LVIII. ASTROHELIA E. & H. 



Similar to Ocidina, but with the calices merely excavated, rarely 

 raised on crater-like elevations. Columella spongy. Tertiary. 



Fig. 170. AslroJidia palmata (Md. Geol. Survey) reduced. 



141. A. palmata (Goldfuss). (Fig. 170.) Miocenic. 

 Branching, often coalescing, or in palmate expansions. Calices 



circular, excavated, septa in three cycles, the first and second 

 reaching the columella. 



In the Choptank and Calvert formations of the Miocene of the 

 Atlantic coast. 



LIX. Balanophyllia Wood. 



Simple conical corals with a broad base of fixation. Septa very 

 numerous, closely crowded and partly fused together. Columella 

 spongy. Epitheca often present, structure porous. Eocenic- 

 Recent. 



142. B. desmophyllum E. & H. (Fig. 172.) Eocenic. 

 Basal portions cylindrical, becoming conical upwards. Section 



elongate, elliptical with rather deep calyx. Septa thin, costae fine. 

 Epitheca rudimentary or absent. 



In the Chickasawan and Claibornian beds of Alabama, Mis- 

 sissippi, Texas and in Maryland. 



143. B. irrorata (Conrad). (Fig. 171.) Eocenic. 

 Slender cylindro conical, curved, cross-section elliptical, tpitheca 



on basal portion. 



