PLATE XLII. 



FIGS. 



1. Placocista jurassica Penard. (p. 46) x 500. After 

 Cash. 



2-13. Sphenoderia lenta Schlumb. (p. 57) Figs. 2, 3. 

 Lateral and oral views. Figs. 4, 5. Lateral views 

 showing broad and narrow views of the aperture. 

 Figs. 6-8. After Cash. Figs. 9, 10. Lateral views 

 showing bi'oad and narrow views of the aperture. 

 Figs. 11-13. After West. All x 600. 



