146 
SELACHII. 
P. 382-4. Three groups of naturally associated teeth, one comprising 
thirteen, the second six, and the third fourteen ; English 
Chalk. Presented by the Earl of Dude, 1881. 
P. 1394. Two teeth ; France. Egerton Coll. 
42861. Large tooth ; Antoign, near Tournai, Belgium. 
Van Breda Coll. 
P. 4554. Detached tooth ; Upper Chalk, Ciply, near Mons, Belgium. 
Ennishillen Coll. 
The following teeth are of the flattened variety shown in Agassiz s 
pi. XXV. figs. 10, 11, and pi. xxv. 6. fig. 23 : — 
P. 5395. Detached tooth ; near Lewes. 
Presented by P. E. Coombe, Esq,, 1888. 
49028. Six naturally associated teeth, cemented by pyrites ; Dover. 
Mrs. Smith’s Coll. 
P. 1393. Four broken teeth ; Gravesend, Kent. Egerton Coll. 
33258. Four similar but smaller teeth ; Upper Chalk, Purfleet, 
Essex. Taylor Coll. 
P. 380. Five naturally associated teeth ; Grays, Essex. 
Presented by the Earl of Dude, 1881. 
33252. Six naturally associated large teeth ; Grays. Taylor Coll. 
P. 4551. Five broken teeth ; Normandy. EnnisTciUen CoU. 
Ptychodus multistriatusy sp. nov. 
Type. Teeth shown in PI. V. figs. 4-6. 
Teeth very similar to those of P. poly gyrus, but having the 
transverse ridges upon the crown relatively much more delicate and 
numerous. 
Form. ^ Loc. Turonian and Senonian : S.E. England. 
P. 2681. Group of ten naturally associated teeth of the lower jaw, 
forming the type-specimen. PI. V. fig. 4 represents a 
median tooth inadvertently placed with the anterior 
border upwards ; fig. 5 a first lateral ; and fig. 6 an 
outer series ; Kent. Ennishillen Coll. 
P. 4549 a. Two teeth ; Kent. Ennishillen Coll. 
P. 4558. Crown of lower median tooth ; Kent. Enniskillen Coll. 
