114 



ON THE FOSSlIi CORALS OP THE 



MiOHELINIA FAVOSOIDBA (BillingS.) 



Corallum forming large hemisplieric or flattened masses ; cella 

 unequal in size, adult diameter about two lines and a-half ; diaphragms, 

 flat, horizontal, with small vesicular swellings, usually around the 

 margins of the upper surface ; septal striae very obscure, six to eight 

 on each plane side of the cells ; pores, very small, irregularly distri- 

 buted, sometimes in rows of five or six across the cell, about one- 

 sixth of a line distant from each other in some places, and sometimes 

 absent in spaces of half a line in width. This species has much of 

 the aspect of Favosites favosa, Q-oldfuss, but is notwithstanding very 

 clearly a true Michelinia. 



Locality and Formation. — Corniferous. Pvama's farm, Port Col- 

 borne. 



Genus Alyeolites. — (Lamarck.) 



Generic characters. — Corallum dendroid or in convex masses. Ca- 

 licos oblique, subtriangular or irregularly ovoid, presenting within 

 three small longitudinal projections representing the radiating septa. 

 A few communicating pores in the walls of the corallites. Trans- 

 verse diaphragms complete. 



The following species appear to belong to this genus : 



Alveolites Labios a.— (Billings.) 



Branching, sometimes sub-palmate, stems, about two lines in thick- 

 ness ; cells small, oval or sub-triangular, the lower lip, when perfect, 

 strongly projecting ; width of each cell, one fifth of a line ; distance 

 of cells from each other, half a line. 



14 15 16 



Pigs. 14 and 15. A. labiosa. Fig. 16. A. c 



The cells exhibit several different forms, according as they are more 

 or less worn. When perfeet, they are transversely oval, and formed 



