PLATE XXIX—Continued. 
Spirifer nobilis, BaiTaude. 
Fig. 16. A section along the longitudinal axis looking into one of the coils. The apparent process on the 
second volution is casual. 
Niagara group. Near Chicago, Illinois. 
Genus AMBOCQCLIA, Hall 
Page 54. 
Amboc(ELIA umbonata, Conrad. 
Fig. 15. A preparation, showing the loosely coiled spirals with but few volutions. X 6. (c.) 
Hamilton group. Western New York. 
Genus SPIRIFERINA, d’Orbigny. 
Page 51. 
Spiriferina Kentuckiensis, Shiitnard. 
Fig. 17. A specimen whose brachidium is jireserved in pyrite ; showing the united jugal processes which 
form a continuous loop. The pedicle-valve is on the lower side of the figure. 
Coal Measures. Vinton county, Ohio. 
