104 North American 



PLATES AND EXPLANATIONS. 



PL.ATE II. 



Generic Illustrations. 



Fig. 1. Proetus Bohemicus, Corda. 



After Barrande's figure (Sil. Syst. Bohemia, Vol. I, pi. 2, B, 

 fig. 15). 

 Fig. 2. The same, showing the hypostoma. 

 Fig. ?i. Gi'iffitMdes longispinus, Portlock, 



Restoration after Woodward's figure, (Monograph Carbon- 

 iferous Trilobites. pi. vii, fig. 6.) 

 Fig. 4. Phillipsia Mchicaldi. var mucronata, McCoy. 



Outline restoration ; (p) position of pores on glabella. After 

 Woodward's figure (Mon. Carb. Trilobites, pi. iv, fig. 15). 

 Fig. 5. Griffithicles seminiferus. Phillips. 



Dorsal view of one of the thoracic segments. After Wood- 

 ward's figure. (Mon. Carb. Tril., pi. v, fig. 8a.) 

 Fig. 6. The same. 



A section of one of the thoracic segments. 

 Fig. 7. Phillipsia trimideata, Ilerrick. 



The glabella, from the Waverly Group, Granville, Ohio ; 

 after Herrick's figure. (Bull. Sci. Lab. Denison Univer- 

 sity, Vol. II, pi. 1, fig. 23 h.) 

 Fig. 8. The pygidium. 



Fig. 9. The restored outline as figured by Ilerrick. 

 Fig. 10. Phillipsia gemmulifera, Phillips. 



Restored outline, after Woodward's figure. (Mon. Carb 

 Trilobites, pi. iii, fig. 6.) 

 Fig. 11. Phillipsia DerUensis, Martin. 



A figure of the hypostoma magnified four times ; after Wood- 

 ward's figure. (Mon. Carb. Trilobites, pi. i, fig. 4 b.) 

 Fig 12. Grffit hides seminiferus, Phillips. 



A figure of the hypostoma enlarged twice, after Woodward. 

 (Mon. Carb. Trilobites, pi. v., fig. 7.) 

 Fig. 13. Brachymetopus Maccoyi, Portlock. 



Restored and enlarged figure of this species as given by 

 Woodward. (Mon. Carb. Trilobites, pi. viii., fig. 13.). 



