PLATE XXVIII. 
Limoptera curvata. 
Page 250. 
1. A large left valve showing the anterior curvature of the beak and the alternation of the radii. 
2. An internal cast of a left valve showing the inler-pallial area covered with small pustules which 
were apparently the points of attachment for umbonal muscles. The specimen shows the pal- 
lial line and muscular impression. 
3. The left valve of a large specimen, showing the wing and sotne traces of the radii. The post-basal 
margin is not sufficiently extended in the figure. 
Hamilton group. Madison Co., N. Y. 
Limoptera macroptera. 
Page 246. 
See Plates 24, 26, 27, 29 and 92. 
4. The right side of a laterally compressed specimen, represented on pi. 27, fig. 9, and pi. 29, fig. 2. 
The umbonal scar is here shown in its true position. 
5. The left side Of an unusually elongate specimen, due in part to the breaking away of the margin 
of the left valve to the margin of the light valve. 
Hamilton group. Madison Co., N. Y. 
