CARBONIFEROUS CORALS AND BRACHIOPODS 101 
(1) Zaphrentis sp., a solid, comute specimen labelled 
Mendips. 
All but the rim of the calyx is obscured, but this 
exhibits numerous septa with a second series of thinner 
intermediates ; there is also evidence of the fossula lying 
on the outer side (i.e. on the side of the broader curve of 
the horn). 
The point being broken, the rough section shows indis- 
tinctly the usual Zaphrentis type of grouping. Until the 
internal structure can be more clearly made out, by means 
of a section, the specimen cannot be assigned to any 
definite species. 
(2) A vertical section of a cornute form, showing a 
deep calyx and a fossular depression on the outer side. 
Diameter of calyx-rim, 18 mm. Extreme length, 42 mm. 
From the Black Rock. Probably Zaphrentis afi Phillipsi, 
Ed. and H. 
(3) Zaphrentis aff Phillipsi, Ed. and H., and Zaphrentis 
aff cornucopice, Mich. 
A polished section from the Black Rock Quarry, cut to 
exhibit a poor transverse section of a Caninia {yA.) con- 
tains also two horizontal sections of small Zaphrentes, 
(а) Probably a very young stage in the development of 
a member of the Phillipsi group, since the section (3 mm. 
in diameter) exhibits a relatively large fossula bisected by 
a long thin septum, and the arrangement of the septa 
shows the very marked grouping, so characteristic of this 
group. 
(б) Probably a young stage in the development of a 
member of the cornucopice group, since the section (6 mm. 
in diameter) exhibits a long, narrow fossula, less obvious 
grouping and a dense circumferential ring, formed of the 
short secondaries and of the thickened ends of the primary 
septa. 
