PLATE LXXXI. 



AviCULOPECTEN FASCICULATUS. 

 Page U. 

 See Plate 5. 

 Fig-. 1. A left valve showing the characteristic fasciculate radii. 



Hamilton group. Near Clarksville. Albany Co., N. Y. 

 Fig. 2. A left valve with finer and more regular radii. 



Hamilton group. Near ClarksoiUe, N. Y. 

 Fig. 3. The specimen pi. 5, fig. 11, redrawn to show the concentric striae. 



Hamilton group. Castleton, Ontario Co., N. Y. 

 Fig-. 4. A right valve preserving the radii on the ears and showing the subdued characters of the surface 

 as compared with the left valve. 



Hamilton group. Near Clarksville, N. Y. 



AVICULOPECTEN LAUTOS. 



Page 14. 

 See Plate 3. 

 Fig. 5. A figure made from an impression in gutta-percha, from tin' interior of the specimen illustrated 

 on pi. 3, fig-. 17, showing more clearly the surface ornamentation. 

 Hamilton group. York Centre, Livingston Co., N. Y. 



