A. S. Woochmrd — Belgian Neozoic Fish-teeth. 113 



collection, and another genus of fishes common to the Upper Creta- 

 ceous and Lower Tertiary is made known. An imperfect left 

 mandibular tooth, wanting the symphysis, is shown of the natural 

 size from the oral aspect in PI. III. Fig. 17. It exhibits the large 

 punctate median tritor, the prominent laminated anterior outer tritor, 

 and the series of small subdivisions of the posterior outer tritor. 



TELE08T0MI. 



Acrotemnus subclavatus (Agassiz). 



1844. Pt/cnodus suhclavatus, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 198, 



pi. Ixxiia. fig. 59. 

 1887. Anomceodus subclavatus, H. Forir, Ann. Soc. Geol. Belg. vol. xiv. p. 25, 



pi. i. fig. 1. 



Numerous detached teeth seem to be referable to this Danian 

 species of Pycnodont, for which we follow Mr. Lydekker ' in adopt- 

 ing the generic name of Acrotemnus (Agassiz), that of Coeloclus ^ being 

 preoccupied. When separating the species from Pycnodus under 

 a new generic name, Forir overlooked the fact that the Agassizian 

 arrangement of the Pycnodont fishes had been revised about thirty 

 years previously by Heckel. The fine right splenial dentition 

 figured by Forir is, however, an important specimen. 



In conclusion, the species from the Lower Danian of Ciply 

 represented in M. Houzeau's collection may be enumerated in a short 

 list. Many moi'e forms could doubtless be recognized if the remains 

 were less fragmentary, and future discoveries of teleostean fishes 

 especially will be awaited with interest. 



Corax pristodontus, Ag. 

 Corax affinis, Ag. 



Chim^roidei. 

 Elasmodus Greenoughi, Ag. 



Elasmobranchii. 

 Squatina, sp. 

 Cestracion, sp. 

 Synechodus, sp. 



Scapanorhynchus rhaphiodon (Ag.). 

 Scapanorhynchus, sp. 

 Odontaspis JBronni, Ag. 

 Odontaspis Hoiizeaiii, A. S. "Woodw. 

 Lamna appendiculata (Ag.). 

 Lamna crassa (Ag.). 



ICHTHYODORULITE. 



Ccelorhynchus (?) cretaceus, Dixon. 



Teleostomi. 

 Acrotemnus subclavatus (Ag.). 

 Enchodus, sp. 



EXPLANATION OF PLATE IIT. 



Fig. 1. Cestracion Duponti, "Winkler; coronal aspect of lateral tootli, twice natural 



size. Bruxellian Eocene, Woluwe St. Lambert. [P. 5921.] 

 Fig. 2. Lamna verticalis, Agassiz ; tooth, inner {a), outer (b), and lateral (c) 



aspects. Ibid. [P. 5915«.] 

 Figs. 3, 4. Pisodus Oweni, Owen ; two detached parasphenoid teeth, coronal {a) and 



lateral [b) aspects. Ibid. [P. 5924.] 

 Fig. 5. Ditto ; portion of parasphenoid dentition, with detached tooth [a) in side 



view. Bracklesham Beds, Sussex. [38827.] 

 Fig. 6. Trigonodon serratus (Gervais) ; anterior lateral tooth, inner (a) and outer (b) 



aspects. Bruxellian Eocene, Woluwe St. Lambert. [P. 5926«.] 

 Figs. 7, 8. Odontaspis Houzeaui, sp. nov. ; two teeth, inner (a), outer [b), and 



lateral [c] aspects. Lower Danian (Craie brune), Ciply. 



[P. 5830.] 



' Nicholson and Lydekker, Manual Palseont. vol. ii. (1890), p. 984. 



^ J. J. Heckel, Denkschr. k. Akad. Wiss. Wien, vol. xi. (1856), p. 202. 



DECADE III. VOL. Vlll. — KO. III. 8 



