








UPPER BALA GROUP. 81 
Case and Reference to McCoy’s : 
Column of F Names and References; Observations, &c. Numbers and Localities. 
Drawers. |Synopsis: and Figures of Genera. 
Upper Bala proper. Llandovery Group. 
Go p- 216. Orthis elegantula, Dalm. (Siluria, | b. 371, Maes-y- | b. 373, Mullock 
2nd ed. pl. 5, fig. 5). fallen, Bala; b. 372, | Quarry; b. 374, Ma- 
Rhosfawr,Glog,near | thyrafal. 
Llanfyllin. 
Go p. 221. Orthis parva (Pander. Geol. Russ. | b, 376, Llanfyllin. | b. 377, Penlan, Llan- 
t. 26, fig. 10). dovery. 
Go p. 221 Orthis parva, var. avellana (De b. 378, Mullock. 
Vern. Geol. Russ, t. 13, figs. 3, 4). 
Go Spirifera, p. 194. Orthis insularis, Eichw. (De Vern. Mathyrafal; a. 978, 
Geol. Russ. Vol. 11. pl. 8, fig. 7). Llettyrhyddod, Llan- 
dovery (Mr Hughes). 
Go p. 220. Orthis hybrida, Sow. (Siluria, 2nd b. 379, Mathyrafal. 
ed. pl. 20, fig. 13). 
Go | Pl.14u, fig. 11, p. 219. | Orthis Hirnantensis, McCoy (Ann. | b. 381, Cwm -yr- 
G Nat. Hist. 2nd Ser. Vol. vir. p. | Aethren; b. 380, . 
395). Very characteristic of the | Maes-y-fallen ; a. 
Upper Bala limestone. 184, Maes-Hir; b. 
382, Aber Hirnant; 
b. 383, Cerrig -y- 
Druidion. 
Go O. confinis, p. 215. Orthis, sp.—Like Strophomena Pecten. b. 384, Mullock. 
Go p- 224. Orthis protensa, Sow. (Siluria, 2nd | b. 385, Ash Gill, | a. 191, Goleugoed; 
ed. pl. 9, fig. 22). A squarish | Westmorland; Llangynyw; Mathy- 
shell, flattened, and with the | Helms Knot, Dent. | rafal, &e. 
hinge-teeth parallel and short. 
Go p- 225 Orthis reversa, Salter (Sil. Foss. Ire- b. 386, Mullock, Gir- 
land, pl. 5, fig. 2). van. 
Go Pl. 1 4, figs. 15—19, Orthis sagittifera, McCoy (Ann. | a. 180, Aber Hir- 
p- 227. Nat. Hist. 2nd Ser. Vol. vim. p. | nant ; Cwm - yr - 
398). Very near to O. turgida. | Aethren, Bala. 
Go p. 228. Orthis testudinaria, Dalm. (Siluria, | b. 388, Maes-y-fal- | b. 889, Mullock, Gir- 
2nd ed. pl. 5, figs. 1, 2). len, Bala. van; b. 390, Math- 
yrafal. 
Go p. 230. Orthis vespertilio, Sow. (Siluria, 2nd b. 391, Mathyrafal. 
ed. pl. 6, figs. 1—3). 
Go O. turgida, p. 229 ‘| Orthis, sp. 0. turgida is a very b. 892, Craig Wen; 

PL. 14, figs. 20—24. 

peculiar species, with good cha- 
racters in the teeth. This is 
distinct. 

Mathyrafal. 
11 
