YORKSHIRE TYPE AMM0NITES-1I Jan 



1914 



Genus, PELECOCERAS, Hyatt 

 ,867, Foss. Ceph. ; Bull. Mus. Comp. Zool., p. 98. 

 o,,lv one species mentioned, P. attenuatum, Hyatt of which there 

 SMS- (an ^S£nSA f *AS2S 



"^^^SS^^nMLTvefortheseriesofHaugin, 



ranged as I, A, £, y. (S. Buckman, Mon. 1898, p. x). 



Result 

 Genus, Pelecoceras, Hyatt, 1867. Genotype P. attenuatum, Hyatt, 

 a species insufficiently known, said to be similar to Am. malagma, 

 Dumortier. 



Genus, PHYMATOCERAS, Hyatt 



1867, Foss. Ceph. ; Bull. Mus. Comp. Zool. pp. 88, 97, 98. 



In p. 88 one species, P. robustum Hyatt, described ; in p. 97, 98, 

 another species, P. enervatum Hyatt described, and P. robustum is 

 mentioned. 



In 1897 Hyatt stated in a letter, " The Phymatoceras robustum 

 is the young of Am. tirolensis, Dum. Pt. iv, PI. xxiv." S. Buckman 

 1898, p. xxx, quoted this, and took it as type of the genus on this 

 assertion. There are, however, points in the generic definition and 

 specific description which make the identification seem doubtful. 



Result 



Genus, Phymatoceras, Hyatt, 1867. Type P. robustum, Hyatt, 

 stated to be young of Am. tirolensis ; Dumortier, non Hauer. 



Genus, HILDOCERAS. Hyatt 

 1867, Foss. Ceph.; Bull. Mus. Comp. Zool. p. 98, 

 Two species are given and four references. The character " ribs 

 Jarge and broad " though not generic shows what form Hyatt had most 

 in mind. Rather heavy ribs characterize the figure named by Bruguiere. 

 S. Buckman, Mon. 1888, in, says " Type — Hildoceras bifrons, Bruguiere 

 sp.," though the identification was general rather than particular. Now 

 it may be restricted to Bruguiere's actual form. 



Result 



Genus, Hildoceras, Hyatt, 1867. Genolectotype, Am. bifrons, 

 Bruguiere. 



Genus, BURTONIA, S. Buckman. 



1910, Jur. Amm. ; Quart. Journ. Geol. Soc. lxvi, 97. 

 Type, the species figured and described, Burtonia crassornata, 

 S. Buckman ; but the name fails from prior use. 



Genus, BREDYIA, S. Buckman 



1 910, Abstracts Proc. Geol. Soc. London, No. 896, p. III. 

 Substituted for Burtonia. Genotype, Burtonia crassornata, 

 S. Buckman. 



