PLATE LXXVII. 



ClMITARIA CORRUGATA. 

 Page 46S. 

 Kg. 1. The right side of an imperfect specimen showing plications on the post-cardinal slope. 



Hamilton group. Monteith's point, CanandaigiiM lake, N. Y. 

 Fig. 2. The right side of a lai'ge individual. 



Hamilton group. iSliore of Canandaigua lake, N. Y. 

 Fig. 3. A small left valve. 



Hamilton group. Sherburne creek, N. Y. 

 Fig. 4. The right valve of a young individual, showing strong folds on the post-cardinal slope limiting the 

 umbonal angle. 



CiMITARTA ELONGATA. 



Pago 4«6 

 Kgs. 6, 6. Two left valves showing the prevailing form of this species. 



Hamilton group. Schoharie and Onondaga Co's, N. Y. 

 Fig. 7. A large right valve. 



Hamilton group. Pra'fs falls, Onondaga Co., N. Y. 

 Fig. 8. A cardinal view of a specimen retaining both valves. 



ClMITARIA RECURVA. 

 Page 467. 

 Fig. 9. The right valve of a small individual. 



Hamilton group. Delphi, iV. Y. 

 Fig. 10. The right valve of a large individual. 



Hamilton group. Madison Co., N. Y. 

 Fig. 11. The cardinal view of a compressed specimen retaining both valves. 

 Fig. 12. The right side of the preceding. 



Fig. 13. The right side of a specimen preserving the surface ornamentation. 

 Fig. 14. A left valve of falcate form. 



Hamilton group. Madison Co., N. Y. 

 Fig. 16. An enlargement of the sui-face from specimen fig. 13. 



ClMITARIA ANGULATA. 



Page 468. 

 Fig. 16. A left valve of a specimen which is somewhat compressed vertically and folded along the umbonal 

 angle. Chemung group. Between Elmira and Waverly, Tioga Co., N. Y. 



