A. 8. Woodicard — Belgian Neozoic Fish-teeth. 105 



Several of the original determinations of the fossils were based upon 

 insufficient comparisons, and have subsequently proved erroneous ; 

 and the examination of M. Houzeau's collection now enables the 

 present writer to confirm and extend the revision commenced by 

 rtoent authors. 



JELA 8 MOBRANCHIL 



Cestracion Duponti, Winkler. PI. III. Fig. 1. 



1876. Cestracion Duponti, T. C. Winkler, Archiv. Mus. Teyler, vol. iv. p. 17, 



pi. ii. figs. 1-3. 



Some anterior prehensile teeth of Cestracion have already been 

 described and named C. Duponti by Dr. Winkler ; and it is interesting 

 to find in M. Houzeau's collection one of the crushing teeth so 

 characteristic of the middle portion of each ramus of the jaw in 

 this genus. The specimen measures 00095 in length and 0-003 in 

 maximum breadth, and is shown from the coronal aspect, of twice 

 the natural size, in PI. III. Fig. 1. Having been discovered in the 

 same formation and locality as the prehensile teeth, and agreeing 

 with the latter in its comparatively small size, the new specimen 

 may also be named G. Bnponti, and thus adds somewhat to the 

 scanty definition of the species. The tooth tapers gradually to its 

 extremities, which are obtusely angulated, almost rounded ; and 

 there is a prominent median longitudinal keel, which rises to a blunt 

 apex at the point of maximum breadth. The coronal surface is also 

 coarsely rugose. 



It is interesting to observe that the crushing tooth just described 

 corresponds more closely with those of the Cretaceous species than 

 with those of the existing forms.; and it may be added that a similar 

 tooth has already been recorded from the London Clay of Highgate 

 Archway.^ 



Odontaspis elegans (Agassiz). 



1843. Lamna elegans, L. Agassiz, Poiss. Foss. vol. iii. p. 289, pi. sxxv. figs. 1-5 



[non figs. 6, 7), pi. xxxviia. fig. 59 [non fig. 58). 

 1871. Lamna elegans, H. Le Hon, Prelim. Mem. Poiss. Tert. Belg. p. 12. 



1875. Lamna elegans, A. Eutot, Ann. Soc. Geol. Belg. vol. ii. p. 34. 



1876. Otodus striatus, T. C. "Winkler, Archiv. Mus. Teyler, vol. iv. pp. 8, 24, pi. i. 



figs. 7-9. 

 1876. Lamna elegans, T. C. Winkler, ibid. p. 9. 

 1876. Lamna elegans, G. Vincent, Ann. Soc. Eoy. Malacol. Belg. vol. xi. p. 123, 



pi. vi. fig. 4. 

 1876. Otodus striatus, G. Vincent, ibid. p. 125, pi. vi. fig. 2. 

 1880. Lamna elegans, T. C. Winkler, Archiv. Mus. Teyler, vol. v. p. 74. 

 1885. Lamna elegans, F. Noethng, Abh. Geol. Specialk. Preiissen u. Thiiriug. 



Staaten, vol. vi. pt. 3, p. 61, pi. iv. 

 1889. Odontaspis elegans, A. S. Woodward, Catal. Foss. Fishes Brit. Mus. pt. i. 



p. 361. 



Typical teeth of this species occur, and it seems most probable 

 that the teeth named Otodus striatiis by Winkler are truly referable 

 to the sides of the upper jaw of the same fish, Noetling has 

 attempted to restore the dentition from the fossils of the Eocene 

 of Samland, placing relatively low-crowned and broad compressed 

 1 Catal. Foss. Fishes Brit. Mus. pt. i. p. 336. 



