112 



ON THE FOSSIL CORALS OF THE 



of large size, marked internally witli numerous vertical lamellar striae, 

 and communicating pores ; base of cells filled up by yery irregular, 

 numerous, highly inclined vesicular plates, not forming distinct liori-' 

 zontal diaphragms ; external or basal epitheca of the general mass^ 

 strong, concentrically wrinkled, and sometimes spinose." — McCoy, 

 British Palceozoic Fossils, page 80. 



This genus differs from Favosites in the vesicular character of the 

 transverse diaphragms, and in the radiating lamellae being represented 

 by vertical striae on the inner surface of the cells, instead of series 

 of minute spines. The cells are usually much larger than in Eavo- 

 sites. The genus appears to be confined to the Devonian and car- 

 boniferous formations. 



MiCHELiNiA coirvEXA. — (D'Orbigny). 

 {Prodr. de PaleonU, t. 1, p. lOT, 1850.) 



Corallum forming hemispherical, or erect rudely cylindrical masses, 

 several inches in diameter ; the base covered by a strong wrinkled 

 epitheca. Adult calices from four to five lines in diameter ; about 

 forty septal striae in each ; pores small, arranged in several vertical 

 series in some of the tubes, irregularly distributed in others ; distant 

 from half a line to more than one line . Diaphragms very convex in 

 the centre of the tubes, and usually with three or four smaller 

 rounded prominences on their surface ; a vertical section shews that 



Fig. 13, Michelinia convexa. Specimea from Rama's farm, near Port Oolborne.- 



