LAMNIDiE. 
359 
teeth; internal face smooth. Crown attaining a maximum height 
of about 0'03, expanded laterally at the base, the sharp edges 
extending to its inferior limit; lateral denticles absent, or mere 
asperities in the anterior teeth, very minute in the others. 
Form. &f Log. Cenomanian (Cambridge Greensand): Cambridge¬ 
shire. 
48382. Five teeth, with imperfect roots, forming the type speci¬ 
mens. The crown of one anterior tooth measures 0*03 in 
height, and the outer face is slightly convex. 
Purchased , 1875. 
28109. Three small examples, one showing a slight longitudinal 
median elevation of the outer coronal face. 
Presented by James Carter , Esq., 1852. 
41915. Four dental crowns. Purchased , 1870, 
35130. Eight specimens. Purchased , 1859. 
The following specimens may belong to the so-called Odontcisqns 
studeri, Pictet 1 (Pictet & Campiche, Foss. Terr. Cretace St. Croix, 
1858, p. 90, pi. xi. figs. 19-23), from the Neocomian of Switzer¬ 
land ; but the evidence is insufficient for satisfactory comparison :— 
P. 5759. Five imperfect teeth ; Neocomian, near Folkestone, Kent. 
The teeth from the Neocomian of Switzerland, named Lamna / 
( Oclontasjyis ) gracilis , L. Agassiz (Poiss. Foss. vol. iii. 1843, p. 2 95,J 
pi. xxxvii. a. figs. 2-4), are also perhaps referable to this genus ; and / £3 
teeth of the same form, from the Lower Cretaceous of Apt, Vaucluse, C ^ a-^C***^ - 
are recorded by E. Aruaud (Bull. Soc. Geol. France, [3] vol. x. C- 
(1882), p. 133) 2 . Gibbes 3 and Giebel 4 identify the species with 
8. subulata. 
Possibly also may be placed here a detached dental crown, from 
the White Chalk of Manganischlak, Caspian Sea, named Oxyrhina 
angustidens by E. von Eichwald (Geogn.-palaeont. Bemerk. Halbinsel 
Manganischlak, 1871, p. 66, pi. iv. figs. 4, 5). . P . /f 2 
1 This seems to be the species provisionally named Odontasyis desorii, Pictet, 
in the Archiv. Sci. Phys. et Nat. 1858, p. 210. 
2 Teeth from the Bruxellian of Belgium are also assigned to this species by 
T. C. Winkler, Archiv. Mus. Teyler, vol. iii. (1874), p. 298, pi. vii. fig. 3. 
3 R. W. Gfibbes, Journ. Acad. Nat, Sci. Philad. [2] vol. i. (1849), p. 198. 
4 C. Gf. Giebel, Fauna d. Yorw., Fisclie (1847), p. 362. 
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