A. 8. Woodivard — Belgian Neozoic Fish-teeth. 109 



Cyhium (?) sp. 



1876. Enchodus Bleeheri, T. C. Winkler, Archiv. Mus. Teyler, vol. iv. p. 43, pi. ii. 

 figs. 24, 25. 



The complete dentition of the Cretaceous genus Enchodus being 

 now known, ^ it is evident that the teeth nanied E. Bleeheri are 

 incorrectly determined. These specimens doubtless pertain to a 

 typical Scomberoid, and may be provisionally assigned to Cyhium, 

 which is already known to occur in the Lower Tertiaries elsewhere. 



Sargus, sp. 



A few anterior teeth exhibit so much similarity to those of the 

 existing Sargus, that either this genus or Lethrinus may be recorded 

 as occurring in the Brnxellian Fauna. The genus has already been 

 determined hj Agassiz - from the Eocene of Montmartre ; and 

 Gervais ^ figures some anterior teeth from the Nummulite-bearing 

 beds of the Dept. Aude. 



Tngoriodon serratus (Gervais). PI. III. Fig. 6. 



1852. Sargus? serratus, P. Gervais, Zool. et Pal. Francj., ExpUc. p. 2, pi. Ix™. 

 fig. 7 {noil fig. 8). 



Very broad cutting teeth much resembling the incisors of Sargus 

 and its allies, ai'e met with in several Tertiary formations ; but they 

 cannot be referred to any known existing genus, since they apjDear 

 to have formed only a single pair in each jaw. Very similar teeth, 

 though somewhat more robust, also occur in the Upper Cretaceous 

 of Northern Africa, and are regarded as the type of an otherwise 

 unknown genus Stephanod'us, by von Zittel,'' who states that they 

 are associated with rounded and oval crushing teeth, probably 

 referable to the inner part of the mouth of the same fish. 



Several of these teeth occur in M. Houzeau's collection from the 

 Bruxellian Eocene, and one example is shown, of the natural size, 

 from the outer and inner aspects, in PI. III. Fig. 6. The trenchant 

 border of the crown is nearly parallel to its basal margin, but is 

 much longer than the latter, which equals in length the compara- 

 tively small root to which the crown is firmly united. Each tooth 

 meets its fellow of the opposite side in a nari'ow curved symphysis 

 in front, and is produced posteriorly into an acute termination. The 

 superficial gano-dentine is smooth, but the trenchant border is 

 prominently and delicately crimped, the numerous vertical folds 

 terminating in serrations, which soon become obliterated by wear. 

 Some of these teeth, indeed, are worn down to short stumps, and it 

 is interesting to observe that the oblique surface of abrasion first 

 appears posteriorly. 



An extremely worn tooth of the general form just described, from 

 the Lower Tertiary of Piedmont, is regarded as the type of a genus 



^ Smith "Woodward, "A Synopsis of the Vertebrate Fossils of the English Chalk," 

 Proc. Geol. Assoc, vol. x. (1888), p. 315, pi. i. figs. 5, 6. 



2 L. Agassiz, Each. Poiss. Foss. vol. iv. (1839), p. 168, pi. xviii. fig. 1. 



3 P. Gervais, Zool. et Pal. Fran9. (1852), pi. Ixix. figs. 14-16. 

 * K. A. von Zittel, Handb. Palaeont. vol. ui. (1888), p. 298. 



