THOLOPORA. 
269 - 
PI. xi. figs, a, c = Lichenopora stellata { = Radiocavea reticulata^ d’Orb.^ 
non Hag. 
Befrancia ohvallata, Mars.). 
Figs, d, (?, ?/= Actinopora diade)na{ = Defrancia miehelmi^ Hag. 
Biseotuhigera michelini 
(Hag.), d’Orb.). 
D’Orbigny, in 1854, removed these species from Befrancia to 
a new genus Radiocavea ; but he reversed von Hagenow’s use of 
the name diadema as follows : — 
Goldfuss. Von Hagenow. D’Orbigny. 
Figs. a-d. Befrancia diadema. Radiocavea reticulata. 
,, e,f. ,, michelini. ,, diadema. 
To add to the confusion, d’Orbigny refers (p. 758) von Hagenow’s 
Befrancia michelini to another genus, as Biseotuhigera michelini. 
According to the usual system of nomenclature the type species 
named by the founder of the genus should fix the interpretation 
of the name ; in that case the type species of Bomopora should 
be one of the following : — 
- (1 ) Actinopora diadema (Goldf.), which includes Goldfuss’ 
figures pi. xi. figs. V2d, e. This species is the Radiocavea diadema 
of d’Orbigny, excluding, however, from d’Orbigny’ s synonyms 
Hagenow, pi. iv. fig. 3, which is Befrancia reticulata, Hag. It 
also included the Befrancia diadema, Hag., pars (pi. iv. fig. 2, non 
fig. 3), and von Hagenow’s Befrancia michelini (Hag. pi. iv. fig. 5). 
(2) Actinopora michelini (Hag.), which, according to von 
Hagenow, included Goldfuss’ figs. 12e, f and is here regarded 
as a synonym of Actinopora diadema. 
(3) Lichenopora stellata (Goldf.), which includes the Radiocavea 
reticulata, d’Orb. The latter species, according to d’Orbigny 
(Bry. Cret. p. 965), includes Goldfuss’ figs. I2a^c, and also the 
Befrancia ohvallata, Marsson, which was also founded on Goldfuss’ 
figs. 12^^^;, and included von Hagenow’s specimen pi. iv. fig. 4, 
described by that author as a worn specimen of Befrancia diadema. 
The name Bomopora is quite unsuited to any of the above 
species, and none of them corresponds to the original diagnosis, 
which describes such a Bryozoon as that illustrated by d’Orbigny’s 
figure of his Bomopora clavula (= clavata, Goldf.), Bry. Cret. 
