131 



Found in the Demissa bed (?), at Eighteen 

 Mile Creek. 



Favosites hamiltoni^e. Hall. (Fig. 13.) 

 (111. Dev. Foss., PL XXXIV.) 



Distinguishing Characters. — Hemispherical 

 heads, often of large size; the base covered 

 by peritheca; slender corallites; somewhat 

 distant mural pores, in two rows ; rather 

 closelv crowded tabulae, some of which are 

 horizontal, others bent down at the angles. 



Found in the Encrinal limestone, at Sec- 

 tion 5, and the Lake Shore; also at Morse pores 

 Creek, at which place heads, afoot or more in diameter, occur 



Kic. 13. 

 hiiuiiltoniif 



Favosites 

 A frag- 



ment of a head slight- 

 ly enlarged, showing 

 the columnar coral- 

 lites and the mural 



(Fig. 14.) 111. 



Genus PLEURODICTYUM. Goldfuss. 



[Ety. : Pleura, side ; dictyon, net.] 

 (Petref. Germ., Vol. I., p. 209.) 



Corallum depressed, discoidal, lower surface covered by a 

 concentrically wrinkled peritheca. Corallites small, pris- 

 matic, funnel-shaped below ; .septa faint or obsolete, a scanty 

 development of tabulae occurring; mural pores irregularly 

 distributed. 



Pleurodictyum stylopora. (Eaton.) 

 Dev. Foss., PL XVIII.) 



Distinguishing Characters. — Flat ba se, 

 covered by peritheca; faint septa; cren- 

 ulated margins of calices ; irregular con- 

 vex or concave tabulae ; diameter one to 

 two inches. 



Found in the Pleurodictyum beds of Avery's Ravine and 

 the Lake Shore (usually abundant). 



Genus AULOPORA. Goldfuss. 



[Ety. : Aulos, pipe ; poron, pore.] 

 (Goldf. Petrefact. Germ., p. 82.) 

 Corallum prostrate, the corallites adhering to foreign 

 bodies by the whole of the lower surface. Corallites slender, 



Fig. 14. Pleurodictyum 

 stylopora (after Hall). 



