118 NEW YORK STATE MUSEUM 



PLATE 8 



Brachyprion schudiertanum sp. nor. 



Page 66 

 Wta. 



1 The apical portion of the brachial valve showing the 



coarse angular striae similar to those of Stropheo- 

 donta arata Hall. x3 



2 The exterior of the brachial valve 



3 External cast of brachial valve 



4 The exterior of an incomplete pedicle-valve 



5 The exterior of a brachial valve 



6 An imperfect interior of the brachial valve 



7 An enlargement of the external surface showing the 



character of the ornament. x5 



Brachyprion majus sp. nov. 



Page 5« 



8 The character of the external surface. x5 



9 The exterior of the pedicle-valve, the umbo of which 



is made somewhat too conspicuous 



10 The interior of the pedicle- valve 



11 An internal cast of the pedicle- valve showing the 



muscular impressions 



12 The exterior of the brachial valve 



13 The cardinal area of the pedicle-valve showing the short 



rows of denticles on either side of the deltidium 



Rhipidomella oblata Hall 



Page 58 



14, 15 Views of the exterior 



Crania pulchella Hall and Clarke 



Page 58 



16 An incomplete specimen showing marks of attachment 



17 A more complete example. x3 



18 Two specimens exfoliated at the apex 



