1871.] HICKS FOSSILS FROM ST. David's PROMONTORY. 399 



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



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



6. Plant, Quart. Joiirn. Geol, Soc, and Trans. Geol. Soc. Man- 



chester, 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 Henky Hicks, Esq. 



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



A largo Trilobite having affinities with Paradoxkles and Anopo- 

 lenus in the form of its glabella, but diifering 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 Farad. 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, Plcuras long and 

 deeply grooved, and with the spines bent backwards. 



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



Paeadoxides Harknessi, Hicks. PI. 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 previouslj^ 

 discovered in Britain, although resembling the Bohemian species P. 

 rugidosus. 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 road- 

 side between Solva and Whitchurch. 



CoNOcoRYPHE Lyellii, Hicks. PI. 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| to 2 inches, breadth from 1 to 1^ inch. 



