DEVONIAN FISHES OF IOWA 129 



suggested to him the propriety of recognizing the type of his 

 R. emigratus as a distinct species is because, at the time of 

 preparing his paper, he was misled into supposing that R. major 

 and R. rostratus, with which he compared it, were strictly North 

 American species, whereas in point of fact both are from the 

 Eifel Devonian. Owing to similarity in form and identical pro- 

 venience, the Baron now agrees (litt.) with the present writer 

 in regarding R. emigratus as synonymous with R. major. That 

 the so-called "Bhamphodus" is not entitled to rank as an inde- 

 pendent genus will be evident from a comparison of the illustra- 

 tion given in Plate III, Fig. 8 with typical Bhynchodonts, and 

 awarding full value to the original description, which is as 

 follows :* 



"Ramphodus [= Rhamphodus], 11. g. mit Praemaxillarzahnen, 

 die zusammen die Form eines Papageischnabels und am inneren 

 Vorderrand einen tiefen Ausschnitt besassen, hinter dem an 

 der Innenseite ein fliigelformiger Fortsatz nach hinten und 

 aufwarts [in reality, downwards] gerichtet war. Mandibular - 

 zahne schmal, vorn scarf zugespitzt, mit glattem, Tritoren 

 entbehrendem Schneiderand und unten einer schwachen Aus- 

 buchtung am ausseren Vorderrand. Eine oberdevonische Art, 

 der Typus der bevorstehenden Beschreibung, R. tetrodon n. 

 spec." 



It has already been remarked that the dental plates of "Bham- 

 phodus" (the statement lacks confirmation that these consisted 

 of more than two pairs) f are acompanied by a series of scale- 

 like ossifications showing precisely the same configuration and 

 tuberculated ornament as certain detached structures which 

 have long been known to accompany Ptyctodont remains in the 

 Middle Devonian of Iowa and Wiscinsin,| and being further- 



*Loc. cit., 1903, p. 392. It may be recalled in passing that the same generic 

 title, with the type species of Bhamphodus dispar, was previously proposed by J. 

 W. Davis for certain Cochliodont teeth from the Lower Carboniferous limestone of 

 Armagh. This fact seems to have been generally overlooked by recent writers on 

 Ehynchodus and related forms. 



tDollo's remarks upon this matter may be quoted in slightly condensed form 

 as follows: "II n'est pas definitivement Stabli que Rhamphodus a une deuxieme 

 paire de plaques dentaires superieures. M. 0. Jaekel mentionne, il est vrai, une 

 telle paire, mais a, l'etat rudimentaire. Cependant, il ne l'a pas figuree jusqu'a 

 present, bien qu'il ait represents deux fois la dentition de Rhamphodus, et il n'en 

 parle plus dans sa derniere communication." Loc. cit., 1907, pp. 1, 7. 



% Dean refers these dissociated remains to Ptyctodus at page 136 of his Chim- 

 aeroid Memoir published by the Carnegie Institution of Washington, 1906. 

 9 



