EXPLANATION OF PLATE XXXII. 



Figure 239. — Auomia acuieata, (p. 697 ;) lower side, natural size. 

 240. — The same, upper side. 



240a. — The same, portions of the upper side magnified. 

 241. — Anomia glahra, (p. 696 ;) profile view, natural size. 

 242. — The same, (p. 696 ;) lower side 

 242a. — The same, (p. 696 ;) young, natural size. 

 243. — Pecten irradians, (p. 695;) natural size. 

 244. — Siliqua costata, (p. 675;) natural size. 

 245. — Ensatella Americana, (p. 674;) natural size. 



(The figures are from Binney's Gould, drawn by E. S. Morse.) 



