A NEW CAMBRIAN TRILOBITE. 137 



ARTICLE V. 



A NEW CAMBRIAN TRILOBITE. 



By G. F. Matthew, M. A., D.Sc, LL.D. 



(Read February 7th, 1899.) 



During my. visit last summer to Newfoundland I had the good 

 fortune to discover a new link between the Cambrian of Europe and 

 that of America. 



In 1888 Meneghini described some trilobites which had been dis- 

 covered in Sardinia under the genus Paradoxides,* but which are 

 different from the types of that genus as known in the north and west 

 of Europe. Subsequently, J. G. Bornemann redescribed these fossils 

 under a new generic name, Metadoxides.i Bornemann found a de- 

 cided difference between this genus and Paradoxides in the form of 

 the glabella ; this part of the head-shield in the latter genus is club- 

 shaped, whereas in Metadoxides it is conical. Now, as the glabella is 

 the most important part of the head-shield, and a part which exhibits 

 prospectively in the larval form, its shape in the adult, it is important in 

 generic classification, and it appears to me that Bornemann was quite 

 right in dividing off his genus from Paradoxides. 



Regarding the forms with conical glabella as a separate genus — 



METADOXIDES, Bornemann, 



we proceed to describe under the name 



Metadoxides magnificus, n. sp., 



a species of the Lower Cambrian beds in Newfoundland. 



A large species with wide, semicircular head-shield, and long genal 

 spines. Middle piece of the head subquadrate. Front broadly arched ;. 

 anterior marginal fold fiat, and scarcely distinguished from the front 

 area of the cheeks (in the flattened tests) ; the two together in front, 



* " Fauna Cambl•iana-Trilobiti,' , Memoirs Geolog. Commis. Italy, vol. iii, pt. 2nd. 



It would be more correct to say that Vleneghiui described two of the species of which 

 he had only the thoraces under Paradoxides, and the third under Olenus. Bornemano hav- 

 ing known heads and thoraces for all three, described them under his new genus. 



t Die Versteinerungen des Cambrischen Schichtensystems der Insel Sardinien, von 

 Dr, Joh. Geo rg Bornemann Halle, 1891. 



