PLATE V. 
Fig. Page 
1. Ptychodns rngosiis, Dixon ; dental crown, coronal and 
lateral aspucts. — Chalk ; llochestor, Kent. [33249.] 137 
2. Ditto ; tooth, coronal, lateral, and posterior aspects. — 
Chalk ; Kent. [33250.] 137 
3. Ditto ; upper median tooth, coronal aspect, associated with 
the preceding. — Chalk; Kent. 1 33250.] 137 
4-0. Ptychodus multistrialvs, sp. nov. ; lower median and 
two lateral teeth, coronal a.spcct, the anterior margin 
in figs. 4 and 0 inadvertently directed upwards. — Chalk; 
Kent. [P. 2681.] 140 
7. Ptychodus polygy run, Agiiasiz; lower median tooth, coronal 
aspect. — Chalk ; near Maidstone. [47905.] 145 
8. Ptychodns otveni, Dixon ; tooth (? lower median), coronal 
aspect. — U. Chalk ; Kent. [39125.] 
138 
