SPIRIFER FIMBRIATUS, Conrad. 
Fig. 10. Dorsal view of an individual with low lateral plications. 
Corniferous limestone. Western New York. 
Fig. 11. A pedicle-valve retaining a portion of the epidermal spinules. 
Fig. 12. An enlargement of a portion of the exterior; showing the double- 
barreled spinules and their lateral branches. 
Hamilton shales. Western New York. 
SPIRIFER SETIGERUS, Hall. 
Figs. 13, 14, Dorsal and profile views of a rotund and normal individual; 
showing incipient deltaria and fimbriated lamelle. 
Chester limestone. Chester, Illinois. 
SPIRIFER PSEUDOLINEATUS, Hall. 
Fig. 15. Dorsal view of a large, partially exfoliated shell; showing the con- 
centric spine-bases. 
Keokuk limestone. Keokuk, Iowa. 
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