1871.] HARKNESS AND HICKS — ST, DAVID's PEOMONTORY. 393 



from. He regards the fossils which occur in these primordial rocks 

 as being of a later age than those found in the primordial zone of 

 Bohemia ; and he looks upon them as representing a period between 

 the first and second faunas of Bohemia *. 



This fauna of Hof has no analogy with the ancient fauna of the 

 St. David's promontory. It is altogether much higher in position, 

 and connects the upper portion of the Lingula-flags of Wales, not 

 only with the succeeding Tremadoc rocks, but also with higher mem- 

 bers of the Silurian series. 



The occurrence of rocks which appertain to the primordial zone of 

 Barrande, in Spain, has been referred to by Sir R. I. Murchison f. 



The arrangement of these Spanish representatives of the primor- 

 dial zone has been given in detail by M. Casiano de Prado J. 



The fauna of the Spanish primordial rocks, which has been ob- 

 tained from a thin series of red limestones, has been described by 

 Barrande. Among the fossils which it affords are seven Trilobites, 

 referable to the genera Paradoxides, Arionellus, Cenoceplialites, and 

 Agnostus. The genus Paradoxides is represented by P. pradoanus, 

 a form which seems to occur only in Spain. The species of Ario- 

 nellus is A. ceticepJialus, Barr,, which is a form found in the primordial 

 rocks of Bohemia. There arfe three species of Conocephalites among the 

 Spanish representatives of the primordial zone, of which two are Bo- 

 hemian, viz. 0. coronatus and C. Sulzeri ; and one form, C. Ribeiro, 

 Barr,, has not yet been obtained elsewhere. Two species of the 

 genus Agnostus are also met with in the Spanish primordial rocks. 

 These several Trilobites have been obtained from deposits which lie 

 north of Scabero, and of Bonar, in the province of Leon. 



Sir li, I. Murchison also states that MM, de Verneuil and Louis 

 Lartet have discovered a "primordial" Silurian range with the 

 same species of Trilobites near Daroca. They also found it in 

 various parts of the Silurian strata which extend from Daroca to 

 Moneayo§, 



The occurrence of fossils, of a type allied to those which are ob- 

 tained from the rocks of St. David's, has been recognized in several 

 localities in North America. Mr. Salter has mentioned Paradoxides 

 Harlani, Green, as occurring in great quantities in Massachusetts. 

 P. Bemietti, Salter, is found in hard, fine-grained, flinty shales at 

 Branch, in the promontory between St. Mary's and Placentia Bays, 

 Newfoundland ; and Mr. Salter alludes to the occurrence of Conoce- 

 phalites antiquntus, Salter, as a form which was exhibited at the 

 Great Exhibition, 1851, and which was obtained from a boulder of 

 brown sandstone in Georgia ||. 



Dr, Dale Owen has mentioned the occurrence in Wisconsin of 

 several forms of Dikelocephalus, with species of Conocephalites, Ari- 



* Faune Silurienne des Environs de Hof, December 1868, 

 t Siluria, 4th edit. p. 416. 



I Bull. Soc. G6ol. France, 1860, vol, xvii. p. 516 et seq. 

 § Siluria. 4th edit. p. 416. 



II " Fossils of the Lingula-flags or Primordial Zoue,'^ Quart, Journ. Geol. 

 Soc. vol. XV. p. 551 et scq. 



