262 SMITH. 



EXPLANATION OF PLATE B. 



Schloenbachia oregonensis Anderson. 



Figs, i and 2. Paranepionic, paralegoceran substage ; diameter 2.25 mm.; two 

 and three-eighths whorls. ^^. 



Figs. 3 and 4. Ananeanic, Styrites stage ; diameter 3.10 mm.; two and seven- 

 eighths whorls, ^jfi. 



Figs. 5 and 6. Ananeanic, Parastyrites stage ; diameter 3.70 mm. ; three and 

 one-fourth whorls. ^-. 



Fig. 7. Metaneanic, advanced adolescent stage ; diameter 5.60 mm. ; three and 

 three-quarters whorls, showing beginning of ribs at diameter 4.70 mm. i^°. 



