PLATE XLV. 



NOCULA NIOTIOA. 

 Page 313. 

 Fig. 1. A cast of a right valve showing- the muscular scars and umbonal pits. 

 Fig. 2. A right valve preserving the surface markings. 

 Hamilton group. Louisville, Ky. 



NdCULA NeDA. ;iimb-ui3 



PftSre 3U. ' 



Fig. 3. A cast of the left valve showing muscular scai-a and hinge crenulations. 

 Fig. 4. A cast of a right valve showing muscular scars. 

 Hamilton group. Louisville, Ky. 



NUCULA LIRATA. 

 Pafte 316. 

 See Plate 93. 

 Fig. 5. A right valve showing anterior muscular scars. 



Hamilton group, ffamilton, Madiscm Co., N. Y. 

 Fig. 11. A large right valve. 



Hamilton group. Shore of Seneca lake, N. Y. 

 Fig. 15. The left side of a cast showing the muscular scars and hinge ci-enulation.s. The on-nnlatioiis in 



the figrnre are continued too far towaiils the posterior end. 

 Pig. 17. A right valve more strongly marked than the preceding. 



Hamilton group. Shore of Seneca lake, N. T. 

 Fig. 18. A left valve. 



Hamilton group. Shore of Seneca lake, N. T. 

 Pig. 19. A right valve of gibbous foi-m. 



Hamilton group. Sliore of Skaneateles lake, N. Y. 

 Pig. 20. A left valve. 



Hamilton gi-oup. Shore of Skatieatelcs lake, iV. Y. 

 Fig. 21. A left valve enlarged, showing some of the crenulations of the hinge-liue. 



Hamilton group. Shore of Ovoasco lake, N. Y. 

 Fig. 22. The surface of the preceding specimen enlarged. 

 Fig. 24. A cast of a left valve enlarged, showing muscular scars. 

 Fig. 25. The cai-dinal view of the preceding, showing muscular scai-s and hinge crenulations. 



