0 « eras so lame 12 at a -29- 
Orbicelia eras so lame Hat a var. nobilis. 
PI. XIII, figs . 2 a, 2 b. 
®Corallum large, irregiilarly convex, and gibbous above. 
Corailites distinct, circular in transverse section, varying in 
size; coenenchyma well developed. Septa very large at the wall, 
linear within, number of large-headed septa remarkable; primary, 
secondary, and tertiary septa often equally large. Calices 
varying in size* Septal number from three to four cycles. This 
form is betv/een the varieties magnet ioa and pulchella . Coll. 
Geol. See 
