268 SMITH. 



EXPLANATION OF PLATE E. 



Schloenbachia oregonetisis Anderson. 

 Development of the septa. 



Fig. I. Diameter 6.0O mm.; about four whorls ; metaneanic. ^-. 



Fig. 2. Diameter 6.40 mm.; metaneanic. ^-. 



Fig. 3. Diameter 8.00 mm. ; paraneanic ; four and one-half whorls. '^-. 



Fig. 4. Diameter 9.20 mm.; paraneanic; four and five-eighths whorls. ^-. 



Fig. 5. Diameter 18.50 mm.; metephebic, early adult; about five and three- 

 quarters whorls, f. 



Fig. 6. Diameter 5.60 mm.; three and three-quarters whorls; front view of 

 Fig. 7, on PI. IV. f 



Fig. 7. Glyphioceras {Muensteroceras) oweni Hall. Pal. N. K, vol. v. Part II. 

 PI. 73, Fig. 6, for comparison with the young stage of Schloenbachia orego 

 nensis. \. 



Fig. 8. Glyphioceras {Muensteroceras) oweni Hall. Loc. cit., Fig. 3, adult, \, 

 for comparison. 



