264 SMITH. 



EXPLANATION OF PLATE C. 

 Schloenbachia oregonensis Anderson. 



Fig. I. Protoconch of Schloenbachia, showing the first six sutures of the 

 attached coil. Enlarged thirty times. 



Fig. 2. Larval stage of Schloenbachia, diameter 0.68 mm.; thirty times enlarged; 

 three-fourths of first whorl. 2a, side view ; 2b, front view. 



Fig. 3. Larval stage of Schloenbachia, diameter 0.64 mm. ; thirty times enlarged. 

 Showing sutures from the third to the tenth. From above. 



Fig. 4. Larval stage of Schloenbachia, diameter 1.20 mm.; fifteen times en- 

 larged ; one and one-half whorls. 4a, front view ; 4b, side view. 



Fig. 5. End of larval stage of Schloenbachia, diameter 2.25 mm. ; fifteen times 

 enlarged. Paralegoceras stage. 5a, side view ; z^b, front view. 



Fig. 6. Cross-section of Schloenbachia, diameter 6.25 mm.; fifteen times en- 

 larged ; four whorls. Adolescent stage. The protoconch is seen in the center P. 



Fig. 7. Cross-section of Schloenbachia, 22.25 "ini-! three and one-half times 

 enlarged ; six whorls. Adult stage. 



