Fig. 14. A fragment of a guard split vertically, the flat surface showing a section of the alveolus filled with spar. This specimen belongs to the Belemnites cylindriformis, of Parkinson.
Fig. 15. a Belemnite (Belemnites coniformis, of Parkinson), having part of the guard broken off, to show the alveolus or hollow in which the apical part of the phragmocone is received. The removed portion has the cast of the alveolus attached to it.
Fig. 16, of which fig. 17, is an enlarged view, is a species of chambered foraminiferous shell, called Nodosaria (N. raphanistrum, of Lamarck); from Sienna. See description of [Plate LXII.]
Plate LX.
PLATE LX.
Ammonites.
Fig. 1. A Belemnite (Belemnitella mucronata) attached to a flint. Kent.