[MATTHEW] STUDIES ON CAMBRIAN FAUNAS 83 



as Solenopleura (?) Howleyi ; the specimens show that the species 

 is intermediate between P. elegans and P. paradoxoides, but nearer 

 the latter. It has a shorter eje-lobe than either of these species, and it 

 has a sharply geniculated — almost mucronate — posterior marginal fold. 

 It has the tubercle at the root of the ocular fillet which appears in P. 

 elegans and is a more distinct feature in P. paradoxoides. Neither of these 

 characters are assigned to P. Hoivleyi. Though Mr. Walcott speaks of 

 only three furrows on the glabella his figure appears to indicate a fourth ; 

 it is evident that four furrows are present in the Smith Sound species. 



The free cheek which occurs with this species is similar to that of 

 P. paradoxoides, but has a shorter spine. 



From the above description it will be seen that this species is closely 

 related to P. paradoxoides, but we hesitate to assume its identity with the 

 New Brunswick species, as there are differences, and it may be found to 

 agree with Walcott's species when the two are better known, 



METADOXIDES, Bornemann. 



In 1888 Meneghini described trilobites which had been discovered in 

 Sardinia, and of which he had only the thoraces, under the genus Para- 

 doxides,^ but which are different from the types of that genus as known 

 in the north and west of Europe. Subsequently, J. G-. Bornemann re- 

 described these fossils under a new generic name, Metadoxides.'^ Borne- 

 mann found a decided 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 shaj)e 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 Parodoxides. 



Metadoxides magnificus. (PI. VIIL, figs, la to e.) 



Metadoxides magnificus, Matt., Bull. Nat. Hist. Soc. N. Brunswick, No. xvii., p. 137, 



pi. iii., 1898. 



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

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

 anterior marginal fold flat, and scarcely distinguished from the front area 

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

 half as wide as the glabella, both widen on each side of the glabella, so 

 that at the facial suture they are as wide as three-quarters of the width 



1 " Fauna Cambriana-Trilobiti," Memoirs Geolog. Commis. Italy, vol. iii., pt. 2nd. 

 - Die Versteinerungen des Cambrischen Schichtensystems der Insel Sardinien, 

 von Dr. Job. Georg Bornemann, Halle, 1891. 



