CE8TRACI0NTIDJE. 273 
47988. Two teeth ; Coral Rag, Wheatley. 
Presented by the Hon. Robert Marsham , 1877. 
41223. Ten teeth, one figured, of the natural size, anterior aspect, 
in PL XI. fig. 8; Kimmeridge Clay, near Weymouth. 
Purchased, 1868. 
41875. Seven large teeth, two figured, of the natural size, anterior 
aspect, in PI. XI. figs. 9, 10 ; also four imperfect anterior 
teeth; near Weymouth. Purchased, 1869. 
43589. Seven large teeth, one figured, of the natural size, posterior 
aspect, iu PI. XI. fig. 11; near Weymouth. 
Purchased, 1872. 
45927. Seven teeth, mostly smaller, and six fragments; near Wey¬ 
mouth. Two specimens are shown, of the natural size, in 
PI. XI. figs. 12, 13. Purchased , 1874. 
P. 2195. Five imperfect teeth; Kimmeridge Pay. Egerton Coll . 
P. 5871. Three teeth; near Weymouth. Enniskillen Coll. 
21430, 31367, 48352. Three teeth ; Oxford Clay, Christian Malford, 
near Chippenham, Wiltshire. Purchased. 
40483 a. Two derived teeth ; Xeocomian Bone-bed, Potton, Bedford¬ 
shire. Purchased, 1867. 
48382 a. Three fragmentary derived teeth ; Xeocomian, Farringdon, 
Berkshire. Cunnington Coll. 
Hybodus basanus, Egerton. 
(?) 1837. Hybodus sulcatus, L. Agassiz, Poiss. Foss. vol. iii. p. 44, pi. x. b. 
figs. 15, 16. 
1845. Hybodus basanus, Sir P. Egerton, Quart. Journ. Geol. Soc. 
vol. i. p. 197, pi. iv. 
1886. Hybodus, A. S. Woodward, Geol. Mag. [3] vol. iii. p. 258. 
Type. Head, with dentition.; J7^s<?cssn jJ /ra.&£> <r#.d dj^F7crjj/, ^ ^ 
Teeth with a very high, much compressed crown; median cone 
narrow, slender, slightly arched inwards; lateral cones two, short 
but sharply pointed. Coronal surface marked by numerous very 
fine vertical wrinkles, often extending to the apices of the lateral 
cones, but always absent upon the smooth upper half of the median 
cone. 
Form. § Loc. Upper Wealden : Isle of Wight and Sussex. 
T 
