I 



PLATE XVI.— Continued. 



Epomphalus (Phanerotinus) Eboracensis. 

 rage 61. 

 Vig. 19. The upper surface of an eutire specimen showing- the general form. 

 Fig. 20. The periphei-j- of the spii-e, showing the cicatrices. 



Figs. 21-23. The periphei-ai sides of thr«e other specimens which consist only of parts of the outer volution. 

 All of these show the constrictions of the tube and the cicatrices left by the removal of frag- 

 ments ; figs. 21 and 22 show the scars extending entirely through the shell. 



PORCELLIA HeRTZERI. 

 Pa^l26. 

 Fig. 34. Lateral view of the specimen, natural size. 



GONIATITES PLEBEIP0RMI8. 

 Page 448. 

 Figs. 25, 26. Lateral and profile views of an individual preserving the chamber of habitation : 

 volutions having been dissolved and removed. 



the inner 



PORCBLLIA NaIS. 



Page 127. 



Fig. 27. Apertui-al view of the typical specimen, which has been obliquely crushed, showing the form and 



characters of the shell and the surface-markings. 

 Fig. 28. The back of the specimen, showing the breadth of the outer volution, the retral bending of the sur- 

 face striffi aci'oss the dorsum, and the oblique, elongate nodes of the lateral angles. 



