1865.] GEOLOGY OF NEW BRUNSWICK. 819 



leaving the descriptions and figures of the species to be given in a 

 paper which will appear in the Appendix to this Report. 



" The fossils as yet known to occur in the rocks of the Saint John 

 group, are principally Trilobites, which are represented by quite 

 a large number of species, and Brachiopoda, which last are of more 

 rare occurrence. All these fossils are preserved as casts or impres- 

 sions, the tests of the Crustacea and the shells of the Brachiopoda 

 being usually transformed into oxide of iron. 



" All the specimens have suffered more or less from distortion 

 through pressure and the metamorphosis to which the rocks en- 

 closing them have been subjected. The Trilobites occur also as de- 

 tached fragments, so that their accurate determination is not easy, 

 and more material is required in order satisfactorily to figure and 

 describe all the species. 



" Representatives of four genera of Trilobites have been obtained 

 thus far from the Saint John rocks, viz : — Paradoxides, Conoce- 

 phalites, Agnostus, and a new genus (?) allied to Conocephalites. 



" The number of species in each genus has not yet been satisfac- 

 torily made out; but of Paradoxides there are at least five, of 

 Conocephalites seven, and of Agnostus and the new genus each one. 



" All the species appear to be new. One of the Paradoxides bears 

 a close resemblance to P. rugulosus, Corda, from the Etage C of 

 Barrande, in Bohemia, and one of the Conocephalites is allied to 

 C. coronatus, Barrande, from the same fauna and horizon, though 

 neither is identical with the European species. 



" There are six species of Brachiopoda, belonging to the genera 

 Orthisina, Discina, Obolella, and Lingula. I have not been able 

 to identify any of the forms with described species. 



" Though all the species from the Saint John group are apparently 

 new, yet the occurrence of Paradoxides and Conocephalites, genera 

 confined entirely to the so-called Primordial fauna of Barrande, 

 and everywhere characteristic of it, together with the strong like- 

 ness borne by the Saint John species, in their facies, to those of 

 the same genera of the faunae of the Primordial in Europe and 

 America, enable us unhesitatingly to assign to the Saint John 

 group, or at least to that lower part of it which has afforded Trilo- 

 bites, a geological position equivalent to Barrande's Etage C, or to 

 the Potsdam proper of America. 



"As Agassiz has shown, Barrande uses the word fauna, in his 

 term primordial fauna, in a sense equivalent to epoch or horizon, 

 A fauna is strictly a collection of animals confined within a limited 

 geographical area. The terms 'primordial fauna/ 'second 



