Section IV, 1887. [ IIS ] Trans. Koy. Soc. Canada. 



XIII. — Illustrations of the Fauud of the St. John Group. No. IV. — Part L Descrip- 

 tion of a New Species of Parudoxides (Paradoxic! es regina). Part II. The 

 Smaller Trilohites unih Eyes (Pty choparidse and Ellipsocephalidœ) . By G-. 

 F. Matthew, M.A. 



(Presented May 25, 1887.) 



Part I. — Paradoxides regina. ' 



1. — Historical Outline. 



1745-53. — One of the earliest known trilobitos, and also one of the largest, was that 

 remarkable species described (about 1745-50) by the illustrious Linnœus, found by him 

 in the Tessin Museum, and which he named Enlomoiithus paradoxus, thereby indicating- 

 its relationship to the crustaceans, and at the same time the enigmatical character of the 

 fossil. This has now come down to us as a species of Paradoxides, which Angelin, the 

 Swedish palaeontologist, assumed to be the type of Paradoxides Tessini, but which he says 

 is unique, as no similar example of the species has since been found. The common 

 variety of the species is var. Wahlenbergii {Entomostracites parudoxissimus^'^ahX.), which is 

 smaller and narrower. 



1827-1833. — About this time C. Boeck described the large Bohemian species, P. spinost/s, 

 which, of the two larger species of Paradoxides occurring in that country, is the one that 

 most nearly resembles the subject of this paper. 



1834. — At this time was discovered the first Paradoxides known in America. It 

 was described by Mr. J. Green, and named Paradoxides Harlani. " "When this species was 

 described, the locality where it occured was not known ; but in 1856, Prof. W. B. Rogers 

 announced the discovery of specimens of this species at South Braintree in Massachusetts. 

 Green's original example was only nine inches long and four broad, but specimens found 

 since then and described by Mr. C. D. "Walcott ■' shew that it attained much greater 

 dimensions. He speaks of an individual of the long form 10 x 21 cm. (^4 X 8 in.) and of 

 one of the broad form 20 X 35 cm. (=8 X 13| in.) This exceeds in size any Scandinavian 

 species of Paradoxides known . 



1852. — In this year appeared Barrande's notable work on the Silurian System in 

 Bohemia in which he described the species Paradoxides Bohemieus, which in appearance and 

 size is near the var. Wahlenbergii of the species first named in this article. Barrande, in 

 the same work, describes another species, \>\\i none of these are of extraordinary size. 

 He mentions, however, that five joints of the body of a very large species had been found, 

 which he calls P. imperialis, and estimates as possibly 40 cm. long ; but no other examples 



' Am. Jour. Sc. and Arts, iii, vol. xxxiii, No. 167, May 1867, p. 389. 



^ Am. Jour. Sc. and Arts, xxv. No. 2, pp. 324-337. ■' U. S. Geol. Surv. Bulletin, No. 10. 



