362 
SELACHII. 
1863. Lamna elegans, K. E. Schafhautl, Siid-Bay. Leth. Geogn. p. 242, 
pi. lxii. fig. 6. 
1871. Lamna elegans , H. Le Hon, Prelim. Mem. Poiss. Tert. Belg. 
p. 12. 
1875. Lamna elegans, A. Rutot, Ann. Soc. Geol. Belg. yol. ii. p. 34. 
1876. Lamna elegans, T. C. Winkler, Arclriv. Mus. Teyler, vol. iv. p. 9. 
1876. Lamna elegans, G. Vincent, Ann. Soc. Roy. Malacol. Belg. yol. xi. 
p. 123, pi. yi. fig. 4. 
1877. Lamna elegans, A. Locard, Faune Terr. Tert. Moy. Corse, p. 5. 
1880. Lamna elegans, T.C. Winkler, Arclriv. Mus. Teyler, yol. v. p.74. 
1883. Lamna elegans, H. B. Geinitz, Abh. Naturw. Ges. Isis Dresden 
p. 5, pi. i. figs. 4-6. 
1885. Lamna elegans, F. Noetling, Abh. Geol. Specialk. Preussen u 
Tbiiring. Staaten, yol. yi. pt. 3, p. 61, pi. iv. 
1888. Lamna huttoni, J. W. Davis, Trans. Roy. Dublin Soc. [2] yol. iv 
p. 15, pi. iii. fig. 1. 
Type. Detached teeth. 
Teeth slender, the inner coronal face marked by delicate but pro¬ 
minent longitudinal striae 1 ; a single pair of small pointed lateral 
denticles ; the two branches of the root long, stout, compressed, and 
generally pointed. Anterior teeth very much elevated and narrow, 
sometimes attaining a total height of 0’065, the long crown slightly 
curved, but scarcely sigmoidal when viewed from the lateral aspect; 
outer coronal face flat or faintly convex ; lateral edges prominent; 
inner face strongly convex, slightl) flattened in the middle; angle 
between the branches of the root acute. More posterior teeth with 
less elevated crowns, broader base, wider angle between the branches 
of the root, and relatively larger lateral denticles. 
The dentition approximates much more closely to that of Oclon- 
taspis than to that of Lamna, a fact apparently only hitherto 
recognized by 0. G. Costa, Paleont. Regno Napoli, pt. i. (1850), 
p. 127. 
Among the specimens originally assigned to this species by Agassiz 
are three teeth ( op. cit. pi. xxxv. figs. 6, 7, pi. xxxvii. a. fig. 58) 
which appear to be truly referable to Lamna ( Otodus ) macrota ; and 
it would be unsafe at present to accept all the determinations of 
teeth from various horizons recorded without figures in many strati- 
graphical works. Noetling {Joe. cit.) has attempted to determine 
the variation in form exhibited by the teeth of different parts of the 
mouth. 
Form. <Sf Loe. 2 (?) Upper Danian: Belgium. Eocene: S.E. 
1 On the Striation of Selachian Teeth, see J. Probst, Wiirtt. Jahresh. vol. xy. 
(1859), p. 100. 
2 See especially A. Rutot, “ Note sur 1’Extension de Lamna elegans, Ag., a 
