THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SIXTH SERIES.] 



" per litora spargite museum. 



Naiades, et circum vitreos considite femtes : 

 Pollice virgineo teneros hie carpite flores : 

 Floribus et pictum, diva?, replete canistrum. 

 At vos, o Nymphae Craterides, ite sub undas ; 

 Ite, reeurvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Dese pelagi, et pingui conchylia sueco." 



N.PartheniiGiannettasii Bel. I. 



No. 97. JANUARY 1896. 



I. — On some Remains of the Pycnodont Fish, Mesturus, dis- 

 covered by Alfred N. Leeds, Esq., in the Oxford Clay of 

 Peterborough. By A. Smith Woodward, F.L.S., of the 

 British Museum (Natural History), 



[Plates I.-IIL] 



The systematic position of the Mesozoic fishes originally 

 named Pycnodonts by Agassiz * has hitherto remained 

 problematical. Notwithstanding the general descriptions in 

 the ' Poissons Fossiles,' the later memoirs of Wagner f, 

 Heckel J, Thiolliere §, and Vetter ||, and the smaller contribu- 



* L. Agassiz, ' Recherches sur les Poissons Fossiles' (1833-44), 

 vols, i., ii. 



t A. Wagner, " Beitrage zur Kenntniss der in den lithographischen 

 Schiefern abgelagerten urweltlichen Fische : Die Pycnodonten," Abh. k. 

 bay. Akad. Wiss., matb.-pbys. 01. vol. vi. (1851) pp. 6-59, pis. i., iii., iv. 



\ J. J. Heckel, " Beitrage zur Kenntniss der fossilen Fiscbe Oester- 

 reiebs : Die Pycnodonten, Agass., oder Pleurolepiden, Quenst.," Denkscbr. 

 k. Akad. Wiss., math.-naturw. CI. vol. xi. (1856) pp. 187-242, pis. i.-xi. 



§ V. Thiolliere, ' Description des Poissons du Jura dans le Bugev,' 

 pt. i. (1854). 



|| B. Vetter, " Die Fiscbe aus dem litbograpbiscben Scbiefer irn 

 Dresdener Museum," Mittheil. k. mineral.-ffeol. Mus. Dresden, pt. iv. 

 (1881). 



Ann. & Mag. N. Hist. Ser. 6. Vol. xvii. 1 



