10 THE GENESEE CONODONTS 
Seven years later Doctors von Zittel and Rohon published a 
paper on Conodonts' in which they reviewed the literature of 
the subject, and concluded, from a comparative study of their 
microscopic anatomy, that the Conodonts have nothing struc- 
turally in common with the dentine or horny teeth of fishes, 
horny teeth of Cyclostomes, lingual teeth of Mollusks, hooklets 
of the Cephalopoda or segment spines of Crustacea, but that 
they agree in form and structure with the masticatory apparatus 
of the Annelida and Gephyrea. 
The following year some new American localities were recorded 
by Dr. J. M. Clarke* who accepts the conclusions of Zittel and 
Rohon, and figures more than twenty Conodonts from the Naples 
shales of Ontario County, N. Y. Following Hinde, he figures 
as Polygnathus dubius a profile view, and as Polygnathus pen- 
natus the upper aspect of the same plate. 
Since the publication of Zittel and Rohon’s paper most authors 
have accepted their conclusions. Zittel himself, however, in his 
Text-book of Palaeontology, admits that the true position of 
Conodonts cannot yet be said to be satisfactorily determined, 
and S. A. Miller* has latterly declared that he is firmly convinced 
that the Conodonts are not the teeth of Annelids but belong to 
the masticatory apparatus of Crustaceans. He omits to give his 
reasons for this decision. 
In 1894 Jaroslaw Perner described as Prioniodus barrandet 
a new Conodont from the Silurian of Bohemia. He omitted any 
discussion of the zoological affinities of Conodonts. 
Ray S. Bassler, Curator of Palaeontology of the U.S. National 
Museum, in his recently published index of American Ordovician 
and Silurian fossils* has placed the Conodonts tentatively as 
fish plates and teeth under the class Pisces. 
And thus the present state of our knowledge of the subject 
may be summarized in the words of Dr. Arthur Smith Wood- 
“Ueber Conodonten: Sitzungber. d. k. bayr. Akad. d. Wiss. Mathem- 
phys. Classe, p. 108, 1886. 
“Annelid Teeth from the Lower Portion of the Hamilton Group and 
from the Naples Shales of Ontario County, N. Y. Sixth Annual 
Report of the State Geologist. Albany, 1887. 
“North American Geology and Palaeontology. Second Appendix, 
1897. 
*Bibliographic Index of American Ordovician and Silurian Fossils. 
Bulletin 92, U. S. National Museum, 1915. 

