LOWER BALA GROUP. 
33 

Column of 
Drawers. 


Gk 
G 
G 
Gk 
Gk 
Gh 

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


Ogygia, p. 149. Pl. 1¥, f. 2. 

Synopsis, Pl. 1r, f.1, p. 149. 
Pl. 1F, f. 14, p. 155, 
C. brevicapitata, Pl. 1 F, f£. 4 
C. Baylet, Pl. 18, f. 8, p. 165. 
Jel, Tes, 18 WSs, Osh 


Barrandia (Ogygia) radians, McCoy (Salter, 
Mon. Brit. Tril. 1866, pl. 19, figs. 1—4). A 
genus distinguished from Ogygia by the 
length of the glabella, and its shape. 
Barrandia Cordai, McCoy (Salter, Mon. Brit. 
Tril. 1866, pl. 19, fig. 5). Short, oval, smooth. 
Asaphus? sp. with a short tail-piece. 
[Lichas patriarchus, Edgell, Geol. Mag. 1866, p. 
162. The earliest species of this genus known 
in Britain. See Middle Bala for genus.] 
Cheirurus (Eccoptochile) Sedgwickii, McCoy. 
A remarkable, large, trilobite, more expanded 
than any other of the British forms; they 
are mostly very convex. A kindred species 
occurs in Bohemia, 
Calymene Cambrensis, Salter (Mon. Brit. Tril. 
pl. 9, figs. 12—14). This has been included 
under C. Baylei, Barrande, and also C. bre- 
vicapitata Portl. by McCoy; but the last is 
a Middle Bala species, and no Bohemian 
forms are identical with ours. 
Homalonotus bisulcatus, Salter(Mon. Brit. Tril. 
1865, pl. 10, figs. 8—10). Homalonotus was 
a long-lived genus, and of all the more per- 
fect trilobites the least trilobed. 
Asaphus (Isotelus) laticostatus, McCoy, not of 
Green. The Asaphus laticostatus of Green 
isa Phacops. (See Salter, Mon. Brit. Tril. 
1866, p. 158, pl. 18, fig. 6.) 
Asaphus tyrannus, Murch. (Salter, Mon. Brit. 
Tril, pl. 21, 22.) One of the largest of all 
known trilobites: sometimes a foot or more 
in length. Mr. Hughes’ specimen (981) must 
have been rather more, It is as character- 
istic of the Lower Bala as the A. Powisti is 
of Middle Bala rocks. 


a. 80, Pen Cerrig, Builth. 
(A most prolific locality, 
full of the fry of Trilobites.) 
a. 79, Pen Cerrig, Builth. 
Shineton, Buildwas. 
Pont Ladies Quarry, Llan- 
deilo. 
a. 78, N. of Builth. 
a. 97, Llandeilo. 
Porth Treuddyn, Caernar- 
vonshire (in beds supposed 
to be = the dark earthy, 
slates of the Ffestiniog 
slate quarries). 
a. 208, Maen Goran, Builth. 
a. 83, Llandeilo. a. 85, Tre- 
gib. a. 82, Craig-y-Glyn, 
Llanarmon, N. Wales. 
a. 981, Llandeilo. A fine 
large specimen. (Mr. T. 
McK. Hughes.) 
