BIHANG TILL K. SV. VET.-AKAD. IIANDL. BAND. 3. N:0 12. 27 



loped ill comparison with that of contemporary formations. In 

 no otlier couutry have so many specific or generic forms been 

 found. From tlie Primordial zone of Bohemia Mr. Barrande 

 mentions only two species, Oi-this Romingeri Bark. and Oholus 

 bohemicus Barr. mscr. Of the same age as tlie Bohemian Pri- 

 mordial zone is evidently the Spanisli, from whicli Barrande 

 and Verneuil have described four species of Brachiopoda, 

 namely Discina primawa, Ortliis jyrimorcUalis, Orthisina vaticina 

 and Orthisina Pellico. ') Besides these, two undescribed spe- 

 cies of uncertain grenus are stated to occur. In the Baltic 

 provinces of Russia the oldest fossiliferous beds contain several 

 species of Brachiopoda, but among these beds there are none 

 which can be parallelized w^ith the Paradoxides beds. In Great 

 Britain several species have been brought to light in the Me- 

 nevian and underlying rocks, which correspond to the Swedish 

 Paradoxides beds and, in part, to the sandstones underlying 

 tlie Paradoxides beds. Up to this day, however, as far as 1 

 know, only six species have been described, namely Lingulella 

 ferruginea Salt. and piiynceva Hicks, Discina plleolvs Hicks, 

 Oholella sagittalis (Salt.) Dav., Oholella maculata Hicks and 

 Orthis Hicksi (Salt.) Dav. To these inight perhaps be added 

 Kutorgina cingulata Bill., but the age of the English rock 

 which has yielded it is not yet settled; by the English geo- 

 logists it is supposed to belong to a higher horizon than the 

 ]\Ienevian. As to the American forms, I am not certain that 

 I can give a complete enumeration, partly because the descrip- 

 tions are scattered in many publications, of which perhaps some 

 iiiay be unknown to me, partly because it does not yet seem 

 to be quite made out which of the American beds belong to 

 the Paradoxides period. The best known representative of the 

 Paradoxides zone in America is the St. Johns group of New 

 Brunswick. From that Mr. Hartt has named four species, 

 lAngula Mattheioi, Oholella transversa, Discina acadica and 

 Ortliis Billingsi. -) One undescribed species of Lingula and 

 one of Orthis are also said to occur. In the lirst volume 

 of his Palseozoic Fossils Mr. Billings describes several Bra- 

 chiopoda from the Potsdam sandstone, of which at least 

 three, Oholus lahradoricus, Oholella chromatica and Kutorgina 

 cingulata, occurring on the nortli shore of the Straits of 



') BuU. Soc. Géol. Fr., voL XVII, p. 532 et seqq. 

 ^) See Dawson, Acadian Geology, 1868, p. 664. 



