74 PEOP. p. MAETiN Duncan's eetision op the 



covered with a complete epitlieca, forming strong circular ridges, 

 wanting here and there. Calices round. No columella (?). 

 Septa broad, slightly exsert, uniting at tlie axis. Endotheca well 

 developed. Gremmatiou lateral, and buds pass up parallel with 

 the parent. 



Distribution. — Fossil. Oolite : Europe, England ? 



V. Alliance PAL^ASTR^OIDA. 



Astrseidse which increase by gemmation from the wall of the parent, 

 and also from the calice. Septal number irregular. Costse occasionally 

 remarkably developed. 



Genus Heterophyllia, M'Coy. 

 Genus Battersbyia, Ed. & H. 



Genus Heteeophtllia, Ji'Coy, amended in Phil. Trans. Royal 

 Soc. 1867, p. 648. 

 Colony of long and slender corallites, free. Gemmation 

 around the calicular margin. Septa either irregular in number 

 and arrangement, or are only six in number and regularly 

 placed. Costse well developed, may be tubercular, spined, and 

 flexuous. Wall thick. Endotheca dissepimental. Epitheca 

 absent. Columella absent or produced by jujiction of the 

 septa. 



Distribution. — Fossil. Carboniferous limestone : United King- 

 dom. 



Genus Batteesbtia, Fd. Sf S., amended in Phil. Trans. Boyal 

 Soc. 1867, p. 648. 



Colony fasciculate. Corallites tall, distant, or close and 

 crowded, free, except when arising from a parent, very variable 

 in dimensions in the same colony, or else subequal. Calices and 

 corallites, on section, circular in outline. Columella absent or 

 produced by union of septa. Septa very unequal in size and 

 number, from 6, 12, to 52 in number. Endotheca vesicular and 

 abundant. Gemmation from the walls of corallites, and the 

 buds have five septa or more ; also by budding from the inter- 

 septal spaces of those buds, of gemmules which develop six septa. 

 There is no epitheca. Corallites without coeuenchyma around 

 them, but often surrounded by Stromatopora. 



Distribution. — Fossil. Devonian : England. 



