THE ANNALS 



AND 



MAGAZINE OF NATUEAL HISTORY. 



[SIXTH SERIES.] 



" perlitora spargite museum. 



Naiades, et circiun vitreos considite fontes : 

 Pollice virgineo teneros hlc carjiite flores : 

 Floribus et pictum, divse, replete canistrum. 

 At vos, o Nymphee Craterides, ite sub undas ; 

 Ite, recUrvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Deee pelagi, etpingui conchylia succo." 



N.PartheniiGiannettasii EoJ. 1. 



No. 97. JANUARY 1896. 



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

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

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

 British Museum (Natural History). 



[Plates I.-III.] 



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, Thiolli^re §, and Vetter |1, and the smaller contribu- 



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

 vols, i., ii. 



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

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

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



X J. J. Heckel, " Beitrage zur Kenntniss der fossilen Fische Oester- 

 reichs : Die Pycnodonten, Agass., oder Pleurolepiden, Quenst.," Denkschr. 

 k. Akad. Wiss., math.-naturw. 01. vol. xi. (1856) pp. 187-242, pis. i.-xi. 



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

 pt. i. (1854). 



II B. Vetter, " Die Fische aus dem lithographischen Schiefer im 

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

 (1881). 



Ann. <fc Mag. N. Hist. Ser. 6. Vol. xvii. 1 



