270 
EADIOPORID^. 
pi. 647, figs. 2, 4, 7, or 8. It is therefore necessary either to 
disregard d’Orbigny’s selection of Ceriopora diadema, Goldfuss, 
pi. xi. fig. 12, or, reducing Bomopora to a synonym of Lichenopora, 
to found a new genus for the species ordinarily referred to it, with 
Bomopora clavata as type. It is unfortunate that d’Orbigny 
selected a typical Lichenopora as the type species of Bomopora ; 
but since he did so, it seems necessary to adopt the latter alternative, 
both as the simplest course and as that required by the usual rules 
of nomenclature. The characteristic species of ‘ Bomopora ’ con- 
sequently require a new name, and Tholopora, which Dr. Bather 
suggests to me as a translation of Bomopora (from 06\o<i, a dome), 
is therefore reluctantly proposed. 
A fresh complication was introduced by Marsson, who suggested 
that von Hagenow accidentally inverted the numbers of figs. 3 
und 4 on his pi. iv. Accordingly, the names to be attached to 
von Hagenow’s figures should be as follows. The fourth column 
records names used in this Catalogue. 
Von Hagenow. 
Fide Marsson. 
Cat. Cret. Bry. 1909. 
PI. iv. fig. 1 
Befrancia disticha, 
Befrancia disticha, 
Actinopora disticha 
Hag. 
Hag. 
(Hag.). 
2 
Befrancia diadema, 
Befrancia diadema, 
Actinopora diadema 
Goldf. 
pars (Goldf.) 
(Goldf.). 
3 
Befrancia diadema, 
Biscocavea reticulata 
' Biscocavea irregu- 
Goldf. 
(Hag.) 
laris (d’Orb.). 
4 
Defrancia reticulata, 
Defrancia ohvallata. 
Lichenopora stellata 
Hag. 
Mars. 
(Goldf.). 
5 
Befrancia michelini, 
Befrancia michelini. 
Actinopora diadema 
Hag. 
Hag. 
(Goldf.). 
The type species of the five associated genera may then he 
taken as follows : — 
Tholopora clavata (Goldf.). 
Lichenopora turhinata^ Defr., figs. \2a—c. 
Radiopora formosa, Mich. 
Biscocavea irregularis^ d’Orb. 
Actinopora stellata (Koch & Dunker). 
