PLATE 45 



Chonetes (Eodevonaria) antiopa Billings 



(Si'e plate 46) 

 Page 208 



I A ventral valve mostly an internal cast, x 3 

 2, 3 Exterior of ventral valves, x 3 



4 Interior of ventral valve, x 3 



5 Billings's original mostly a ventral cast, x 2 

 Grande Greve limestone. Perce Rock 



Chonetes (Eodevonaria) hudsonicus Clarke and metatype gaspensis nov. 



Page 238 



6-9 Internal casts of ventral valves 



10 Enlargement of squeeze taken from specimen 6 to illustrate the char- 



acter of the denticulate hinge, x 3 



11 Interior of a dorsal valve, x 2 



12 The ventral hinge taken from a squeeze enlarged from figure 7, show- 



ing coarse denticulation and the prominence of tlie median septum 



13 A coarsely ribbed example, x 2 



14 A ventral valve, x 2 



15 Exterior of dorsal valve 

 Gaspe sandstone. Gaspe Basin 



Chonetes canadensis Billino^s 



Page 205 



16, 17 Young shells. X7 



18 The spined cardinal area of the ventral valve 



19 A very young shell, x 10, showing the median stria and smooth 



protegulum 



20 A mass of young shells for the most part in sections, grouped in verti- 



cal position about a center 



2 1 Exterior of adult ventral valve with very strong median stria 



22 Exterior of ventral valve 



23 Partial internal cast of ventral valve, showing impressions of the radial 



sinuses of the pallial surface 



342 



