PLATE XLY. 
Nucula niotica. 
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. 
Nucula Neda. 
Page 314. 
Fig. 3. A cast of the left valve showing - muscular scars and hinge crenulations. 
Fig. 4. A cast of a right valve showing muscular scars. 
Hamilton group. Louisville, Ky. 
Nucula lirata. 
Page 316. 
See Plate 93. 
Fig. 5. A right valve showing anterior muscular scars. 
Hamilton group. Hamilton, Madison Co., N. Y. 
Fig. 11. A large right valve. 
Hamilton group. Shore of Seneca lake, IV. Y. 
Fig. 15. The left side of a cast showing the muscular scars and hinge crenulations. The crenulations in 
the figure are continued too far towards the posterior end. 
Fig. 17. A right valve more strongly marked than the preceding. 
Hamilton group. Shore of Seneca lake, N. Y. 
Fig. 18. A left valve. 
Hamilton group. Shore of Seneca lake, N. Y. 
Fig. 19. A right valve of gibbous form. 
Hamilton group. Shore of Skaneateles lake, N. Y. 
Fig. 20. A left valve. 
Hamilton group. Shore of Skaneateles lake, N. Y. 
Fig. 21. A left valve enlarged, showing some of the crenulations of the hinge-line. 
Hamilton group. Shore of Owasco lake, IV. 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 cardinal view of the preceding - , showing muscular scars and hinge crenulations. 
