EXPLANATION. OF PLATE XXXII. 
FIGURE 239.—Anomia aculeata, (p. 697 ;) lower side, natural size. 
240.—The same, upper side. 
240a.—The same, portions of the upper side magnified. 
241.—Anomia glabra, (p. 696;) protile 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 FE. S. Morse.) 
