GUELPH FAUNA IN THE STATE OF NEW YORK 147 



Dalmanella cf. hybrida Sowerby (sp.) 



Page 42 

 FIG. 



7, 8 Two views of a small shell, doubtfully referred to this species. 

 x5. Rochester (Arey collection) 



Dalmanella cf. elegantula Dalman (sp.) 



Page 41 



9 Single specimen observed. X3. Rochester (Arey collection) 

 Spirifer crispus (Hisinger) Hall 



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10 Internal cast of the ventral valve of a specimen with obscure 

 ribs. Natural size. Upper Shelby bed (N. Y. State 

 Museum) 



11, 19, 20 Three views of a well preserved example of the prevailing 



expression of the species, showing the character of the 

 surface. x2. Upper Shelby bed (N. Y. State Museum) 



12, 13, 1 8 Three views of the internal cast of a similar form. xz. 



Rochester (Arey collection) 

 14, 1 6, 17 Three views of a finely preserved specimen from the same 



locality. X3 



1 5 Enlargement of the surface, to show the characteristic papil- 

 lose sculpture of the species. x5- Rochester (Arey col- 

 lection) 



Spirifer cf. bicostatus (Vanuxem) Hall 



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21 Internal cast of a ventral valve. x2. Rochester (Arey 



collection) 



22 Lateral view of a shell with similar characters. Natural size. 



Upper Shelby bed (N. Y. State Museum) 



Rhynchotreta cuneata americana Hall 



Page 46 



23-25 Three views of a specimen, natural size. Upper Shelby 

 bed (N. Y. State Museum) 



