131 



Found in the Demissa bed (?), at Eighteen 

 Mile Creek. 



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

 (111. Dev. Foss., PI. XXXIY.) 



Distinguishing Clmracters. — Heniispherieal 

 heads, often of large size: the hase covered 

 by peritheca; slender corallites; somewhat 

 distant mural pores, in two rows; rather 

 closely 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 p'^'«'^<^'^'-h*")- 

 Creek, at which ])lace heads, a foot ormorein diameter, occur 



Fift. 13, Fai'osifes 

 hdiitiltdiiiif. A frag- 

 ment (if a head slight- 

 ly fularged, showhig 

 the cokimnar coral- 

 lites and the mural 



Genus PLEURODICTYUM. Goldfuss. 



[Ety. : Pleura, side ; diet yon, net.] 

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



Corallum depressed, discoidal, lower surface covered bv a 

 concentrically wrinkled peritheca. Corallites small, pris- 

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

 development of tabulae occurring: mural [)()res irrcgularlv 

 distributed. 



Pleurodictyum stylopoija. (Eaton.) (Fiu. 14.) 111. 

 Dev. Foss., PI. XVIII.) 



Distinguishing Clinracters. — Flat base, 

 covered by peritheca: faint se])ta; cren- 

 ulated margins of calices ; irregular con- 

 vex or concave talmhe ; diameter one to 

 two inches. 



Found in the Pleurodictyum beds of Avery's Ravine and 

 the Lake Shore (usually abundant). 



Fio. '\i. PTeurodictyiim 

 fi/liqinni (after Hall). 



Genus AULOPORA. Goldfuss. 



[Ety. : Ai/los, pipe ; jwros, pore.] 

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

 Corallum prostrate, the corallites adhering to foreign 

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



