24d YORKSHIRE TYPE AMMONITES Mar. 



1911 



Species of PALTOPLEUROCERAS 



1789, P. spinatum, Bruguiere sp. ; cf. d'Orbigny, lii. 



1818, P. costatum, Reinecke, sp. Maris prot. 68. 



1828, P. hawskerense, Young & Bird sp. xiv, 6, much reduced fig. 



1843, P. birdi, Simpson sp. p. 49. 



1855, P. solitarium, Simpson sp. p. 93. 



1867, P. pseudocostatum, Hyatt sp. p. 90 ; for type A. costalns 

 nudus, Quenstedt, Jura, xxi, 3. Advisable to use Hyatt's name instead 

 of nudus to avoid confusion with Amaltheus nudus. 



1867, P. pseudospinatum, Hyatt sp. p. 90 ; for type Quenstedt, 

 Ceph. V. 10. 



1884, P. elaboratum, Simpson sp. p. 128 (Y.T.A. xxii). 



1911, P. apyrenum, nom. nov. founded on Amaltheus solitarius, 

 Blake (non Simpson) York. Lias, 1876, viii, 2, (f ). 



1911, P. boreale, nom. nov. founded on A. vittatus ; Phillips (non 

 Young & Bird) Geol. York. 1829, ''"i- 9- 



Am. Solaris, Phillips, Geol. York. 1829, i'^' 29, may be a Palto- 

 pleuroceras. 



