PLATE XLV— ConUnued. 



NucuLA Randalli. 



I'aRO 315. 

 See Plate 98l'l 

 Pigs. 6, 9. Right and cardinal views of a specimen. 

 Fig. 10. An enlargement of the left side of the preceding. 

 Figs. 7, 8. Right and left -vnews of another specimen. 

 Fig. 16. An enlargement from the preceding. 

 Fig. 23. A cardinal view of a specimen enlarged. 



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

 Fig. 26. The left side of a cast showing muscular scai-s and pallial line. 

 Fig. 27. The cardinal view of the same showing muscular soirs and hinge crenulatious. 



Hamilton g^-oup. Ovmberland, Md. 



NuCULA DIFFIDEN.S. 



P8ge82,!. ^ tiojlliilj'.ll 



Fig. 12. A cast of a left valve showing muscular scat's and surface striae. 



Lower Chemung gi-oup. Ithaca, N. T. 

 Fig. 14. A left valve, imperfectly preserved, showing surftice strise and posterior muscular scar. 



Lower Chemung group. Ithaca, N. Y. 



NnOUIiA tAMEt-TiATA. 



Page 3-20. 

 See Plates 51, 93. 

 Fig. 13. An enlai-gement of a left valve of this species, imperfectly repi-esented. 

 Lower Chemung group. Itltaca, N. Y. 



NucuLA Houghton I. 



I'lige 3>3. 

 Fig. 29. A partial cast of a right valve showing the exterior markings. 



Fig. 30. A giitta-pei-cha imjiression fi-om a cast of a left valve, showing hinge crenulations, musculai- scars 

 and pallial line. 



Waverly group. Newark, Ohio. 

 Fig. 31. The cast of the interior of a left valve enlai-ged, showing muscular scai-s, pallial line, hinge ci-enu- 

 lations and cartilage pit. 



Waverly group. Neumrk, Ohio. 



„i,A SUBELLIPTIOA. 



.•Mniil«Iiin*i!i fty^ntii Imji frm-xi tp.ii) i-. .-jaiii' 



Pajfe 317. 



Fig. 28. A cast of a right value, natural size, showing muscular scars. 



Hamilton group. Cutnberland, Md. 



