PLATE XLII. 



Figs. 



1. Placocista jurassica Peiiard. (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, lO.^Lateral views 

 showing broad and narrow views'^of the aperture. 

 Figs. 1 ] -] 3.— After West. All x 1600. ^ 



