108 A. S. Woodivard — Belgian Neozoic Fish-teeth. 



vertebrae closely resembling those of the latter genus are well 

 known from several European Lower Tertiary formations ; and 

 a single vertebra has been recorded from the Bracklesham Beds.^ 



Pisodus Oioeni, Owen. PI. III. Figs. 3-5. 



1844. Pisodiis Otvenii, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 247 (name only). 



1845. Pisodus Otvenii, R. Owen, Odontography, p. 138, pi. xlvii. fig. 3 ; also 



Cat. Foss. Rept. and Pisces Mus. R. Coll. Surgeons (1854), p. 167. 



Numerous detached teeth occurring in the Briixellian of Woluwe 

 St. Lambert are identical with those of the peculiar dental armature 

 described by Owen from the London Clay of Sheppey under the 

 name of Pisodus. Two of these specimens are shown of the natural 

 size in PI. UL Pigs. 3, 4, and a portion of the typical dentition from 

 Sheppey is represented for comparison in Fig. 5. The teeth are 

 rounded or irregularly angulated, while the superficial gano-dentine 

 is thin and soon removed by wear. The greatest diameter of the 

 tooth is at the base of the crown, and the hollow root tapers below 

 to its point of attachment to the bottom of a socket in the support- 

 ing bone. 



, The aiEnities of Pisodus seem to have hitherto escaped recog- 

 nition, but a fine skull from Sheppey in the British Museum 

 (No. 39439) shows that in all essential cranial characters it is 

 identical with the existing Elopine Clupeoid, Albula. The peculiar 

 tritoral dentition occurs upon the parasphenoid bone, and is precisely 

 similar to that of the last-named genus. 



Ancistrodon fissuratus (Winkler). 



1852. Sargus^ armatus, P. Gervais {errore), Zool. et Pal. Fran9., Explic. p. 5, 



pi. Ixix. figs. 9, 10. 

 1852. Sarffus? serratus, P. Gervais {errore), ibid. p. 2, pl. Ixvii. fig. 8. 

 1874. Corax fissuratus, T. C. "Winkler, Archiv. Mus. Teyler, vol. iii. p. 299, 



pl. vii. fig. 4. 

 1876. Corax fissuratus, T. C. Winkler, loc. cit. vol. iv. p. 12, pl. ii. figs. 11, 12. 

 1883. Ancistrodon armattcs, W. Dames, Zeitschr. deutsch. geol. Ges. vol. xxxv. 



p. 664, pl. xix. fig. 2. 



As pointed out by Dames the specimens named Corax fissuratus 

 by Winkler are truly pharyngeal teeth of a teleostean fish, and 

 may thus be assigned to the provisional " genus " Ancistrodon. 

 They are identified by Dames with three teeth from the Nummulitic 

 Series of the Dept. Aude and Cuise-la-Motte, erroneously associated 

 by Gervais with teeth of Sargus and other genera under the names 

 of Sargus ? armatus and Sargus ? serratus. 



Phyllodus, sp. 



1876. Fhyllodus Deborriei, T. C. "Winkler, ArcMv. Mus. Teyler, vol. iv. p. 28, 

 pl. ii. figs. 14-18. 



Though undoubtedly referable to the typical Phyllodus, the pha- 

 ryngeal dentition described by Winkler is too imperfectly known 

 for specific determination. 



1 "Woodward and Sherborn, "Catalogue of British Fossil Vertebrata" (1890), 

 p. 111. 



