






48 UPPER CAMBRIAN. 
C d , 
Golarariot eee eo Motor Names and References; Observations, &c. Numbers and Localities. 
Drawers. | Synopsis: and Figures of Genera. 
G Serp. dispar, p. 132. Serpulites, sp. (not the S. dispar, Salter) from Caradoc grit, Hollies, Shrop- 
Pl. 1D, figs, 11, 12. Upper Silurian. shire? 
Gl Pl. 1D, fig. 15, p. 130. Crossopodia scotica, McCoy. a, 225, Thornielee Quarry, 
on Tweed. 
Small bivalve Crustacea (water- 
fleas). CRUSTACEA—Phyllopoda and Trilobita. 
G1 Pl ae a 138 Ceratiocaris? umbonatus, Salter. Oval con- | Bala; Corwen; Conway 
Be ne ara vex valves of a bivalve Crustacean, very | Falls; Llanfwrog, near 
common. Ruthin, under the Old Red 
Strata (stream section). 
a. 113, Dermydd Fawr, 
Denbighshire. 
Gl Primitia McCoyii (Salter MSS. — Cythere | Keisley, Dufton, Westmor- 
phaseolus, McCoy, Synopsis Sil. Foss. Ire- | land. 
land, p. 58, pl. 1, fig. 1). 
G1 Primitia McCoyii, var. Pusgill, Dufton, ib. 
G1 Pl. 15, fig. 3, p. 136. Beyrichia complicata, Salter (Mem. Geol. | Coniston. Pwllheli. Llan- 
Surv. Vol. m1. pl. 19, fig. 9), a most curi- | fwrog, Ruthin; Dermydd 
ously ornamented and deeply grooved species, | Fawr. Pont-y-Meibion, S. 
extremely common. of Llangollen, Mynydd 
Mawr, Llanfyllin, &c. &e. 
G1 Beyrichia complicata, var. Dermydd Fawr, Denbigh- 
shire. 
PL 15, fig. 1, p. 136. Primitia strangulata, Salter. (One of the | Coniston. 
Q simpler forms of the genus—with only one 
S furrow. 
=) 
Gl Trilobites. Trilobita auctorum. The majority of large 
forms of this order (always excepting the 
giant Paradowides of the Lingula flags) 
occur in the Bala group: great species of 
Asaphus, Homalonotus, Lichas, &c. In 
fact the Bala group may be taken to be 
the metropolis both of the Trilobites, the 
Orthides, and the Orthoceratites. 
G1 Trinodus agnostiformis, Agnostus trinodus, Salter (Decade Geol. Surv. | Rhiwlas, Bala. 
Pl. 1 &, fig. 10, p. 141. 
T. tardus, 
Pl. 1 F, fig. 9, p. 142. 

No. 11, pl. 1, figs.) 8—10). The simplest 
form of trilobite known—and the smallest. 
It represents well the embryonic forms of 
larger trilobites. 
