EXPLANATION OF PLATE XXXII. 
* 
FIGUne 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 ;) profile view, natural size. 
242.—The same, (p. 696 ;) lower side. 
242a.—The same, (p. 696;) young, natural size. 
243.—Pecten jrradians, (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.) 
