102 CARBONIFEROUS CORALS AND BRACHIOPODS 
Caninia (of McCoy) [~ the group of Za'phrmtis cylin- 
drica of Ed. and H.]. 
Those Zaphrentids which have a central area crossed by 
broad, close tabula and in which each tabula has a deep 
depression near its circumference (the “ fossula were 
separated by McCoy under the generic name Caninia. The 
convenience of this separation has been generally acknow- 
ledged, but the name Caninia has been discarded and 
replaced by the generic name Campophyllum. 
This is, in my opinion, a mistake caused by deceptive 
parallel-development. 
The essential characters of Caninia, McCoy, are the broad 
tabulse and the deep fossula ; the presence of the fossula 
introduces a strong bilateral symmetry which, whenever 
the septa extend conspicuously over the tabulae, is rendered 
still more obvious by the Zaphrentis type of grouping. 
Campophyllum, Ed. and H., was created to cover a 
group of cyathophyllids which have a broadly tabulate 
central area and short radial septa, not reaching the 
centre ; the strong radial symmetry and the very incon- 
spicuous nature of the bilateral symmetry clearly indicate 
the close relationship of this group to the genus Cyatho- 
phyllum. 
Whenever, as is usually the case, the ring of short septa 
in a Caninia is not conspicuously continued over the 
tabulae towards the centre, the general resemblance of the 
horizontal sections of Caninia and Campophyllum is 
remarkably strking, but in all cases the nature of the 
fossula forms a perfectly distinctive character for separating 
the two genera. 
In the horizontal section of a Caninia the fossula is 
usually occupied by a short, unique septum, and is bounded 
by the two septa on either side, which converge round it 
and form an arch ; usually also, one or more smaller arches 
lie within this main arch and indicate the intersections of 
