LAMNID^. 
429 
The following species have also been founded upon detached teeth, 
but there are no examples in the Collection ; — 
Corax antiquus, E. E. Deslongchamps, Le JuraNonnand, Mon. vi. 
(1877), p. 4, pi. i. figs. 4-5. — Lower Oolite ; Normandy. 
Corax incisus. Sir P. Egerton, Quart. Joum. Geol. Soc. vol. i. 
(1845), p. 163, woodcut. — Upper Cretaceous ; Pondicherr}', 
Madras, India. 
Corax Imiig, C. G. Giehel, Fauna d. Vorwelt, Fische, p. 371. — 
Turonian ; Quedlinburg, Prussia. 
Corax pyqmceug, G. von Munster, Beitr. Petrefakt. vii. (1846), 
p. 19. Oaleus piygmcnts, G. von Munster, op. cit. v. (1842), 
p. 66. — Miocene ; Vienna Basin. [The generic position 
of this tooth is said to have been decided by microscopical 
examination.] 
The so-called Corax Jissuratug, T. C. 'Winklor (Archiv. Mus. Teyler, 
vol. iii. (1874), p. 299, pi. vii. fig. 4), from the Bruxellian Beds of 
Belgium, is founded upon a tooth of a Ganoid or Teleostean (see 
IV. Dames, Ucber A)icigtrodon, Debey, in Zeitschr. deutsch. geol. 
Ges. vol. XXXV. 1883, p. 655). 
A few teeth of doubtful Lamnidac, in form somewhat suggestive of 
Corax, are named Xemdolamia, J. Leidy, Journ. Acad. Nat. Sci. 
Philad. [2J vol. viii. (1877), p. 251. Two species are distinguished 
from the Ashley River Phosphate Beds, South Carolina : — X. pravvs, 
Leidy {tom. cit. p. 251, pi. xxxiv. figs. 33, 34) and X. simplex, 
Leidy {tom. cit. p. 2.51, pi. xxxiv. figs. 35, 36). The following 
specimens are also closely similar: — 
49954. Small tooth ; Lower Chalk, Guildford. Capron Coll. 
P. 5813. Larger stouter tooth ; Cenomanian, Saratov, Russia. 
By exchanye, 1888. 
Genus CETORHINUS, H. D. de Blainville. 
[Bull. Soc. Philom. 1816, p. 121.] 
8yn. Helache, G. Cuvier, Regne Animal, vol. ii. 1817, p. 129. 
Hannotera, P. J. van Boneden, Bull. Acad. Roy. Sci. Beige, [2] 
vol. xxxi. 1871, p. 604. 
Second dorsal fin and the anal very small. A pit at the root of 
the caudal fin ; side of the tail with a keel. Gill-clefts very large 
and wide. Teeth very small, numerous, and conical, without lateral 
denticles, and rarely or never serrated. 
