THE FAUNA OF THE ST. JOHlSr GEOUP. 



119 



Great Tkilobitbs of the Third Fauna. 



Homalonotiia rhmotropù, figured by Angelin. 



U. rhinotropis, Barrande (Supplement) , 



H. delphinocephalus, do. do 



Bronteua palifer, as stated by Barrande 



Dalmanites spinifera, do. do 



Width. 



cm. 

 9 



Length. 



cm. 



19i 



20 

 18 

 23 

 25 



2. — Paradoxides regina. 



Paradoxides maximus, corpore latissimo, depresso. 



Capite valde expanso, angidis in spinis brevibvs produdis ; glabella lata, sulcis duobus 

 perfecfis ; oculis breviatis, contra sulcos positis. 



Thorax articvlù xvii, axe corporis UUissimo; plevrarum apicibnsfoliosis, curvalù, vixreflexis, 

 tribus posterioribus breviorihus. 



Pygidium postice subquadratum, axe parvo, laferibus postice extensis. 



Hypostoma postice qtiadratum, sed angvlis truncatis ; lobe anteriore latitndine valde expanso ; 

 margine anterions expanso, latitudine extenso. 



The body of this species is broadly oval, or, without the anterior marginal fold and 

 genal spines, elliptical ; it is about one quarter longer than broad, and the test was thin 

 and flexible. 



The head shield is very broad, owing to the great width of the marginal fold, espe- 

 cially at the sides. The glabella is very wide, but its oiatlines obscure in the best example 

 known (from the form of the hypostome we infer that the dome especially was wide). 

 Two furrows only are known ; of these, the posterior is nearly straight in the middle 

 third, where it is shallower, but arches forward sharply at the extremities ; the anterior of 

 the two furrows has an open sigmoid curve arched forward in the outer third and back- 

 ward at the middle third, where it is shallower. The occipital furrow is arched forward 



