Spirifer subcuspidatus Schnur var. lateincisus Scupin 



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15, 16 Internal casts of ventral valves 

 1 7 Exterior of dorsal valve 



18 Internal cast of dorsal valve 



19 Internal cast of ventral valve 

 Locality. Presque Isle stream 



Chonetes aroostookensis Clarke 



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20 Ventral valve, somewhat more rhomboidal than usual 



21 Interior of a dorsal valve 



22 Internal cast of a ventral valve 



23 The dorsal hinge, x 2 



24 Internal cast of a ventral valve, x 3 



25 Exterior of a small ventral valve, x 3 

 Local it v. Edmunds Hill 



Chonetes paucistria Clarke 



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26 Sculpture cast of ventral valve showing the relatively sparse and sharp 



plication, x 2 



27 Enlargement of the surface, x 4 



Locality. Edmunds Hill 



227 



