PLATE 36. 
Figs. 1-13. Spirifera granulifera. 
1. Dorsal view of a small individual. 
2. Cardinal view of the same, showing great height of area. 
3. Profile of same. 
4. Ventral view of another specimen, showing an angular mesial sinus. 
5. Ventral view of a well preserved and perfect specimen of the ordinary size. 
6. Dorsal view of the same. 
7. Profile of same, for comparison with fig. 3. 
8. Front view of same. 
9. Ca/dinal view of the same. 
10. Dorsal view of a larger and less gibbous specimen, showing more of the ventral area. 
11. View of the interior of a dorsal valve, showing the muscular impressions, area and dental 
sockets. 
12. View of the interior of a ventral valve, showing the muscular impression, cardinal area, 
and the callosity within the apex of the foramen. 
13. Enlargement of a part of two plications, showing the granulose structure of the surface. 
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