UPPER CAMBRIAN. 

Case and 
Column of 
Drawers. 

Go 
Go 

Reference to McCoy’s 
Synopsis: and Figures of Genera. 

Names and References; Observations, &c. 
Numbers and Localities. 

Odontochile, p. 161. 
Pl. 1 G, figs. 15, 16. 
T. gibbifrons, p. 145. 

Terebratule, &e. 
Lamp shells. 
Spirigerina, p. 197. 

do. p. 198. 
Hemithyris, p. 201. 
Hemithyris, p. 202. 
Pl. 1g, fig. 10. 

Phacops obtusicaudatus, Salter 
(Mon. Brit. Tril. 1864, pl. 1, figs. 
4245). A species with the 
habit of the common Dudley 
P. caudatus (Dudley butterfly). 
The tail is blunt. 
Proetus, sp. Fragments only. 
Trinucleus concentricus. 
MOLLUSCA BRACHIOPODA. 
Lamp shells are very common in the 
Llandovery rocks, and indeed 
throughout the Bala series. But 
the genera Meristella, <Atrypa, 
Pentamerus are hardly known in 
Middle Bala, and become of great 
importance in this division. The 
other Brachiopods are chiefly 
Upper Cambrian, but a few are 
Silurian forms. 
Atrypa marginalis, Dalman (Siluria, 
3rd ed. pl. 9, fig. 2). One of the 
long-lived forms, beginning in 
the Middle Bala rock. 
Atrypa reticularis, Linn. (Siluria, 
2nd ed, pl. 9, fig. 1). The earliest 
appearance of this truly cosmo- 
polite fossil. 
Atrypa hemispherica, Sow. (Siluria, 
2nd ed. pl. 9, fig. 3). 
Atrypa hemispherica, var. scotica, 
McCoy. A large variety. Dav. 
Sil. Brach. t. 13, fig. 31. 
Lingula, sp. Lingule are rare in 
the Llandovery rocks, 


Upper Bala proper. 

a. 132, Cold Well, 
near Wrae, Winder- 
mere; Helms Knot, 
N. E. side? 
Helms Knot, Dent. 
N. of Llanfyllin. 

Llandovery Group. 
a, 137, Pen-y-Craig. 
b. 207, Allt Goch, 
Llanfyllin; Mathyra- 
fal; Goleugoed. 
b. 208, Goleugoed. 
a. 199, Mullock. 
b. 209, Pen-y-Craig. 
