EXPLANATION OF PLATE XXVIIL 



Fig 



67. Belemnttes hastatus. 



Three views of a large specimen from the upper part of the Oxford Clay in 

 Cowley Field, near Oxford ; in the Cabinet of Mr. Parker. Fig. 67, /, lateral 

 view, showing the rather faint oblique groove ; v, the ventral aspect, with 

 its deep characteristic furrow, suddenly followed by a shallower channel : 

 f/, dorsal aspect ; s', the cross section of the alveolar cavity ; s" , section 

 across the expanded part of the guard. 



68. Two views of a specimen from the Oxford Clay of Northamptonshire, presented to 



the Oxford Museum by Mr. Leeds, B.A., of Exeter College. 

 /'. Lateral view, showing the oblique groove ; v , ventral aspect, showing the 

 deep mesial groove expanding retrally ; /, the cross section of the 

 alveolar cavity ; cross section of guard in the narrowest part ; 

 s"\ cross section in the widest part ; s"", cross section near the apex ; 

 ^, a compressed phragmocone, partly covered by the guard. 



69. Young specimens from the Oxford Clay of St. Ives, presented to the Oxford 



Museum by Mr. J. F. Walker, of Sidney Sussex College, Cambridge. 



Lateral view, showing a recurved apex ; ventral aspect of the same ; 

 s^, cross section of alveolar cavity ; s^, cross section of enlarged guard : 

 ^;^ ventral aspect of a younger individual ; I* and y*, views of a still 

 younger shell ; v", views of a shorter and more bulbous example ; 

 v^, y^, views of the bulbous variety, with interrupted ventral groove. 



70. ju. Deformity. The specimen is from the Oxford Clay of Cowley Field, near 



Oxford. Cabinet of Mr. Parker. 



