ANTHOZOA. 49 



regular series of round holes or mural pores. A series of small 

 shelves or squamce are generally found on# the inside of the wall 

 near these mural pores. In form the compound coral mass may- 

 be a hemispheric or spherical "head," a plate-like expansion, or 

 variously branching with cylindrical branches. 



Literature. 



1851. Milne-Edwards, H., et Haime, J. Monographic des Poly- 

 piers Fossiles des Terraines Paleozoiques. Arch, du Museum, Paris, 



Vol. V. (describe many American species). 

 1874. Nicholson, H. A. Palaeontology of the Province of Ontario, 



Toronto. 

 1876. Rominger, C. Fossil Corals. Geol. Surv. Michigan, Vol. 



III., pt. II., pis. 1-55. 

 1843-87. Hall, James. Palaeontology of New York. Vols. 1, 2, 3, 



6, and Illustrations of Devonian Fossils. 

 1879. Nicholson, H. A. Tabulate Corals of the Palaeozoic Period. 



Blackwood & Sons. 

 1882. Hall, James. Fossil Corals of the Niagara and Upper Helder- 



berg Groups. 1 2th Report Indiana Geol. Surv. 

 1885. Davis. Kentucky Fossil Corals. Geol. Surv. Kentucky. 

 1900. Vaughan, T. Wayland. The Eocene and Lower Oligocene 



Coral Faunas of the United States. Mon. U. S. Geol. Surv., 39. 

 1898 to date. Green, G. K. Contributions to Indiana Palaeontology. 

 1899-01. Lambe, Lawrence M. A Revision of the Genera and 



Species of Canadian Palaeozoic Corals. Geol. Surv. Canada, Contr. to 



Canad. Pal., Vol. 4. 



Key to the Genera. 



A. Coral simple *. 



* Surface covered by a wrinkled epitheca which extends to the edge of the calyx., f. 

 f Coral conical, cylindrical, or compressed conical not composed of invag- 



inated cups or funnels a. 



a. Septa well developed, the longer reaching to center aa. 



aa. Central columella well developed, not formed by the septa I. 



I. Coral compressed, columella spongy, septa numerous in 

 multiples of six, earlier ones much larger than later ones. 



LIII. Flabellum. 



1. Coral conical columella projecting and solid II. 



11. Columella compressed XXVII. Lophophyllum. 



II. Columella round Cyathaxonia. 



aa. Columella absent, pseudocolumella sometimes formed by twisting 

 of septa 2. 



2. Coral conical (cylindrical), the tetrameral arrangement of 



the septa visible in the calyx or in the external septal 

 grooves %. 



