EXPLANATION OF PLATE XXXII. 



FIOVKE -m-Anomia aculeata, (p. 097 ;) lower side, natural size, 

 040. The same, upper side. 



&amp;gt;40a. The same, portions of the upper side magnified. 

 Ml Anomia glabra, (p. (596;) profile view, natural size. 

 ; &amp;gt;42 The same, (p. 696 ;) lower side. 

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

 243. Pecten irradiaus, (p. 695;) natural size. 

 244. Silimia costata, (p. 675 ;) natural size. 

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



(The figures -are from Humpy s Gould, drawn l.y E. S. Morse.) 



