igii ASTEROCERAS v 



Genus, DACTYLIOCERAS, Hyatt, 1867 

 1867, Foss. Ceph. ; Bull. Mus. Comp. Zool., V, 95. 



Hyatt did not choose a type but he indicated it — SnKriJXios = anniilus ; 

 so that one of the species with anniilus in its name should be the type. 

 There is Nautilus annularis, Reinecke, and Am. annulatus, Sowerby, 

 given by Hyatt : the former is a misidentification, as it happens to be a 

 young Peltoceras, therefore the latter may be chosen. Oppel selected 

 as the type of the latter Sowerby's fig. 5, of PI. ccxxii (Jurat. 255). 



Dadylioceras = compressed annulate Dactyloids which did not 

 develop fibulation. 



Result 



Genus, Dactylioceras, Hyatt, 1867. Genolectotype, A. annulatus, 

 J. Sowerby, 1818, ccxxii, 5. 



Genus, PERONOCERAS, Hyatt, 1867 

 1867, Foss. Ceph. ; Bull. Mus. Comp. Zool., V, 85. 



The type is definitely indicated — nepovr) = fihula, a buckle, whence 

 Am. ftbulatus. For this only one citation is given. 



Peronoceras is a branch of Dadylioceras which develops button & 

 loop ornament (fibulation). Thus Peronoceras = compressed, fibulate 

 Dactyloids. In catagenesis the Dactylioceras pattern is revived, with 

 fibulation only a neanic feature, often obscure. 



Result 



Genus, Peronoceras, Hyatt, 1867. Genoholotype A. ftbulatus, 

 J. de C. Sowerby. 



Genus, PORPOCERAS, nov. 



Type, Am. vortex, Simpson, No. 29 



This genus is proposed for the strongly ornamented, massive, fibulate 

 Dactyloids — nopnr], a buckle. 



Genus, ASTEROCERAS, Hyatt. 1867 



1867, Foss. Ceph. ; Bull. Mus. Comp. Zool., V, 79, 80. 



The genotype species is definitely indicated by the meaning of the 

 name Asteroceras—darfif) = stella, whence Am. stellaris. Hyatt gives 

 three citations under that : as he mentions Enghsh specimens. Am. 

 stellaris, Sowerby, is taken as the type. 



Result 



Genus, Asteroceras, Hyatt. 1867. Genolectotype, Am. stellaris, 

 J. Sowerby. 



