A CARBONIFEROUS FAUNA FROM NOWAJA SEMLJA. 153 



diagnosis of the genus, founded on an examination of this and allied species, is appended 

 below : — 



Corallum simple and turbinate. Major septa meeting in the centre of the 

 coral in the early growth-stages. One of the septa, usually the counter septum, is 

 strongly thickened at the inner end, giving rise to a prominent columella, which may be 

 discontinuous. In the more mature growth-stages, the columella persists, but the septa 

 usually retreat from the centre and become amplexoid, while dissepiments appear 

 between the tabulae and the wall. The tabulae are arched upwards in the centre to 

 a varying degree, but, unlike such genera as Dibunophyllum, there is no central zone 

 where the tabulae are more numerous or vesicular, nor is there a system of vertical 

 lamellae distinct from the septa. 



All the simple forms of the genus Koninckophyllum of Nicholson and Thomson, 

 and also those corals referred by Thomson to Acrophyllum* thus fall into Lophophyllum 

 as above denned. It is suggested that the compound forms of Koninckophyllum should 

 also be included, as they only differ from a true Lophophyllum, in their pronounced 

 lateral budding. From Lithostrotions of the L. martini type the genus is distinguished 

 by being almost always simple and not forming tubular colonies. 



Those corals referred by Nicholson and Thomson and other authors to Lophophyllum 

 (e.g. L. proliferum and L. eruca) do not develop dissepiments at any stage of growth, 

 and are essentially Zaphrentes having one of the septa thickened at the inner end. It 

 may be convenient at some future time to group them as a sub-genus of Zaphrentis, 

 but for the present such a course is not considered advisable. 



Lophophyllum cherneyense sp. nov. (PI. I. figs. l-2d.) 



EXTERNAL CHARACTERS. 



Corallum cylindrical and twisted for the greater part of its length ; conical and 

 curved only at the proximal end. Epitheca thin, smooth, with numerous constrictions 

 of growth, but no longitudinal ribbing. Calyx unknown. 



The largest specimen measures 2'5 cm. by 4 cm., but is incomplete; eight other 

 fragments were also found. The full length may have been 8 cm. or more. 



INTERNAL CHARACTERS. 



Transverse Sections. — Major septa thin, straight, and tapering towards the inner 



end ; no stereoplasmic thickening. In proximal sections (PL I. figs. 2c, 2t/) they all 



reach the central columella formed by a thickening of the inner ends of the cardinal and 



counter septa. In later growth-stages, most of the septa fall away slightly from the 



columella, although a few are still prolonged over the central area in an irregular 



manner. 



* Thomson was mistaken in his conception of this genus, which was distinctly stated by Nicholson to have no 

 columella. Good figures of the genotype, A. oneidense (Billings) are given by Lambe in Contrib. lo Canadian Pal., 

 vol. iv. part 1, pi. xvi. figs. 1 and 2 (1899). 



