GUELPH FAUNA IN THE STATE OF NEW YORK 1 47 



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 



Page 42 



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, 18 Three views of the internal cast of a similar form. X2. 



Rochester (Arey collection) 

 14, 16, 17 Three views of a finely preserved specimen from the same 

 locality. X3 

 15 Enlargement of the surface, to show the characteristic papil- 

 lose sculpture of the species. X5. Rochester (Arey col- 

 lection) 



Spirifer cf. bicostatus (Vanuxem) Hall 



Page 44 



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) 



