Page:Quarterly Journal of the Geological Society of London, vol. 27.djvu/541

 4. Salter & Hicks, Report Brit. Assoc. 1865.

5. Salter & Hicks, Quart. Journ. Geol. Soc. 1865.

6. Plant, Quart. Journ. Geol. Soc, and Trans. Geol. Soc. Manchester, 1866.

7. Salter & Hicks, Report Brit. Assoc. 1866.

8. Salter & Hicks, Quart. Journ. Geol. Soc. 1867.

9. T. Belt, Geol. Magazine, 1867.

10. Davidson, Geol. Magazine, 1868.

11. Hicks, Report Brit. Assoc. 1868.

12. Salter & Hicks, Quart. Journ. Geol. Soc. 1869.

Descriptions of New Species of Fossils from the Longmynd Rocks of St. David's. By Henry Hicks, Esq.

Plutonia Sedgwickii, Hicks. Pl. XV. figs. 1-8.

A largo Trilobite having affinities with Paradox-ides and Anopolenus in the form of its glabella, but differing from them in having the whole of its surface covered with coarse tubercles or spines. No perfect, specimens have been found, but numerous fragments, including glabella, cheeks, head-spines, and portions of the thorax. These, however, show a form nearly equal to Parad. Davidis in size ; and it is therefore, next to that species, the largest Trilobite discovered in British Cambrian rocks. The head is semicircular, with a wide margin and tolerably long posterior spines. The glabella is large, strongly convex, wider than the cheeks, and reaches anteriorly to the frontal margin ; it has three complete transverse lobes, and one incomplete lobe on either side, and is widest across the anterior lobe. Cheeks triangular. Eyes large, extending from near the anterior furrows of the glabella to about half of the length of the cheeks* The thoracic segments show also a strongly tubercular surface. The axis is wide and slightly convex. Pleurae long and deeply grooved, and with the spines bent backwards.

Locality. — Headland near Nun's well, St. David's.

Paradoxides Harknessi, Hicks. Pl. XV. figs. 9-11.

Of this species the head and some fragments only have been found ; but these show a species entirely distinct from any previously discovered in Britain, although resembling the Bohemian species P. rugulosus. The eyes reach the whole length of the cheeks, and are strongly raised at each extremity. The glabella is large, reaches far forwards, and is indented by three complete furrows, and two incomplete ones on either side.

Locality. — Headland near Nun's Well, St. David's, and on roadside between Solva and Whitchurch.

Conocoryphe Lyellii, Hicks. Pl. XVI. figs. 1-7.

An exceedingly well-defined species, and the earliest known of the genus. It occurs tolerably plentifully, and in a well-preserved state. Ovate in form, surface generally raised, and more or less convex. Length from 1-1/2 to 2 inches, breadth from 1 to 1-1/2 inch.