152 DR G. W. LEE ON 



Genus Carcinophyllum Thomson. 



Carcinophyllum sp. (PL I. figs. 8-8&.) 



Besides the figured specimen, another example, complete but of small size, was 

 obtained. 



The corallum is conical and very slightly curved. The calyx is deep and the 

 epitheca smooth, with slight accretions of growth. In the mature growth-stages, when 

 it is separated from the septa, the epitheca is seen to be of medium thickness, but at 

 the proximal end of the corallum appears to be of great thickness, owing to the complete 

 fusion of the septal bases. 



A comparison of figs. 8 and 8b shows that, with increasing age, the complexity of 

 the lamellae in the central area increases, an Aulophyllum-Yike character being assumed. 

 Such a fact, observable also in other species of the genus, suggests that the Aulophylla 

 may have been evolved directly from the Carcinophylla. It is interesting, therefore, 

 to note that Dr Vaughan finds the maximum of the genus Carcinophyllum to be at 

 the base of his D x sub-zone, while the Aulophylla appear much later, at the top of the 

 D 2 sub-zone. 



Such a genetic connection as is here suggested does not, of course, preclude the 

 possibility of representatives of these two genera existing side by side. They un- 

 doubtedly do so in this Nowaja Semljan fauna, and also in the Scottish Carboniferous 

 Limestones ; Dr Sibly has also found such an association in the D 2 sub-zone of the 

 English Midlands. 



*&' 



Genus Lophophyllum M. Edw. and H. 



1845. Cyathaxonia (pars), Michelin. 



1850. Lophophyllum, M. Ed. and H. 



1876. Koninckophyllum, Nicli. and Tliom. 



1883. Acrophyllum, Thorn, (non Nicli.) ; non Lophophyllum, Nich. and Thorn. 



The opportunity is here taken to give a revised diagnosis of the genus Lophophyllum,, 

 two species of which occur in Dr Brtjce's collection. 



Michelin, in 1846, when describing the corals of Tournai, referred to his genus 

 Cyathaxonia a new species which he named C. tortuosa. Later, in 1850, Milne 

 Edwards and Haimr established the genus Lophophyllum, selecting as the type 

 L. Jconincki, which also came from Tournai. 



An examination of a large number of topotypes of these two "species" shows that 



(1) Lophophyllum Jconincki is simply a young form of " Cyathaxonia" tortuosa, which 



(2) cannot be referred to the genus Cyathaxonia, as in the mature growth-stages a 

 well-marked zone of dissepiments appears between the tabulae and the wall, and such a 

 feature is quite absent in Cyathaxonia proper (e.g. C comu Mich., or C. rushiana 

 Vaughan). 



The genotype of Lophophyllum therefore is L, tortuosum (Mich.), and the revised 



