MIDDLE BALA GROUP. 
67 

Case and 
Column of 
Drawers. 
Reference to McCoy's 
Synopsis: and Figures of Genera. 
Names and References; Observations, &c. 
Numbers and Localities. 



C. cancellata, p. 287. 
Heteropods—such as Atlanta. 

p- 308. 




Conularia, Miller, 1818. A large horny, pro- 
bably transparent shell, highly ornamented, 
like certain species of Cleodora. The genus 
has a long range from the Tremadoe rocks 
to the Coal measures! Some of the species 
had long lobes between the four angles 
converging in age so as to close in the 
aperture. 
Conularia Sowerbyi, Defr. (Siluria, 2nd ed. pl. 
25, fig. 10). Ranges from Bala rocks to 
Ludlow,—compressed. 
Bellerophon, Montfort, 1808 (Bucania, Hall, 
and Huphemus, McCoy). 
Most authors have agreed to regard Bellerophon 
as a Heteropod or Nucleobranch ; of larger 
size and stronger shell than the living forms. 
In support of this view we have the facts, 
that many species have extremely thin and 
ornamented forms of shells; that they bave 
a deep notch in the mouth like the living 
Atlanta; and globose forms in others, like 
the majority of the small living (Heteropods) 
Nucleobranchs. Against the idea that they 
could be single chambered Cephalopods, we 
have Ist, their thin and small shells (few 
attain the size of the smallest shelled Cepha- 
lopods) ; 2nd, if the analogy be drawn with 
Argonauta (instead of Carinaria as usual), 
it will be necessary to suppose that Decapod 
cuttlefishes abounded in Cambrian times, 
an idea wholly at variance with the observed 
facts, which limit Decapods to the secondary 
and tertiary epochs, I cannot follow Prof. 
McCoy here. 
Bellerophon bilobatus, Sow. (Siluria, 2nd ed. pl. 
7, fig. 9). The surface is covered with an 
extremely fine reticulation, not yet figured 
in any work. This kind of ornament is 
conspicuous and common in the genus. 

a. 214, Bryn Melyn, Bala. 
The species is easily dis- 
tinguished by its 
pressed form, and 
square section, from the 
coal measure fossil, Con. 
quadrisulcata. 
com- 
not 
a. 161*, Dolydd Ceiriog 
Waterfall, in the Berwyns. 
a. 161, Teirw River, N. 
Wales, 8. of Llangollen ; 
Horderley and Cheney 
Longville (in Shropshire), 
most abundant; Dinas 
Mowddwy; Llanwddyn. 
