118 



G. F. MATTHEW : ILLUSTEATIONS OF 



Great Trilobites op the First Fauna. 



Paradoxides Tesmii, full length, fdi' Barrande. . . . 



P. Tessini genuinus, as figured by Angelin 



P. Tessini ( ]Vahlenbergii ?), Brogger, estimated . . . . 



P. spMio,f!(.5, full length, fide Barrande 



P. Forchammeri, Brogger's estimate 



P. Forchammeri, Angelin's estimate, fide Brogger.. 



/'. Forchammeri, Angelin's figure 



P. Dmidis, as figured by J. W. Salter 



P. Davidis, as estimated by Salter, as I understand his descrip- 

 tion 



P. Bcnnettii, as figured by Salter 



P. Harlani, statement of J. Green 



P. Harlani, figured by C. D. Walcott 



P. Harlani, estimated by Walcott 



P. regina, by example figured 



P. regina, estimated from fragments — if of the broad form. .. 

 " " " if of the narrow form, probably. 



Width, 



Head. 



20 



15^ 

 8 



24 



14 



3nj 



35 

 35 



Thorax. 



15J 



Hi 



5i 



18 



10 



11 



19è 



21 



24J 



25 



Length. 



To 



6' d of 



pygidium. 



27 



22 

 11 



32 

 26 



20i 



38 

 38 

 44 



To 



tips of 

 pleurai. 



cm. 

 30 



30 



16 



30 



27 



28 



25 



13 



38 



27 



20 



22 



3U 



3S 



38 



45 



Great Trilobitbs op the Second Fauna. 



Niche insignia 



N. lata, figured by Angelin 



Asaphus platycephalus, Barrande (in Supplement) 



A. tyrannus (England), do. do. 



A. nobilis (Bohemia), do. do 



Megalaspis heros (Sweden), as figured by Angelin 



Asaphus Barrandei, Barrande (in Supplement) 



Megalaspis aculicavda, estimate from the pygidium by Brogger 



Asaphw (Isotelus) gigas (New York), estimated from fragments by J. Hall . 

 A. {Isotelus) megistos (Ohio), estimated from fragments (by S. A. Miller?). . 



Width. 



14 



17 



17? 



17 



27? 



30? 



Length. 



cm. 



20 



19 



22 

 26 

 28 

 35 

 40 



40;5 



45s 

 50 



