PLATE XXVI.— Continued. 
Bellerophon trileratfs, juvens ? 
Page 118. 
Fig. 15. A small imperfect specimen, preserving • the tricarinate character, with faint marks of revolving 
striae. 
Fig. 16. The dorsal side of a specimen exhibiting the tricarinate character, with faint indications of concen¬ 
tric undulations. 
Bellerophon nactus. 
Page 121. 
Fig. 17. The dorsal side of a small specimen which is unusually narrow, with a sharp carina. 
Fig. 18. A dorso-lateral view of a broader and more gibbous specimen. 
Bellerophon IVLera. 
Page 119. 
A cast of the interior, preserving the dorsal carina and showing the expanded peristome. 
A specimen partially preserving the shell, from which the surface-markings have been removed by 
maceration and solution. 
Lateral view of a large specimen, from which the shell has been partially removed by maceration, 
and preserving the surface-markings on the outer portion of the volution. 
Lateral view of a cast of the interior. 
A longitudinal section, showing the inner volutions and the gradual thickening of the columellar 
lip. See, also, plate 25, figure 10. 
Bellerophon Leda. 
Page 120. 
Fig. 24. A dorso-lateral view of a specimen with a simple dorsal band, without revolving strise, and some 
incipient longitudinal plications. 
Cyrtolites (Cyrtonella) pileolfs. 
Page 125. 
Fig. 25. A dorsal view of a specimen in which the shell is partially preserved. 
PORCELLIA NAIS. 
Page 127. 
A dorsal view of the specimen, showing the mesial band. 
An oblique ventral view of the preceding specimen. 
The inner volutions of another individual, showing the fine cancellating stria and lateral nodes. 
Fig. 26. 
Fig. 27. 
Fig. 28. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
Fig. 23. 
