786 THE AMERICAN NATURALIST.  [VOL. XXXIII. 
name to gurletanus. In 1891! Mr. Woodward referred the 
species to Sagenodus. In a posthumous paper, published in 
1897,2 Cope described as a new species another Sagenodus 
gurleianus. This evidently requires a new name. I propose 
S. textilis. 
In 1889% Newberry described a dipnoan tooth, which he 
called Dipterus (Ctenodus) radiatus. But the name is preoccu- 
pied. Eichwald in 1844‘ described a C. radiatus, and in 1858° 
this was referred by Pander to the genus Dipterus. Newberry’s 
species may be called D. contraversus. 
The genera which have been known as Rhizodus and Mega- 
lichthys are particularly exasperating cases from the point of 
view of nomenclature, and I regret that it appears necessary 
to deal with them. Megalichthys is credited to Agassiz and 
Hibbert, and was apparently first proposed in a paper published 
by Hibbert in 1836.6 The only species there described is M. 
hibberti, although another, M. falcatus, is mentioned. The age 
of the enclosing rocks is Lower Carboniferous. The genus and 
species are clearly based on the materials collected at Burdie- 
house, near Edinburgh, although the descriptions are clouded 
somewhat by Agassiz’s knowledge of the remains of a different 
fish found in the museum at Leeds. This was derived from the 
coal measures, and Agassiz regarded it as identical with the 
Scottish specimens. When in 1844" Agassiz came to describe 
M. jibberti, he based his description on the Leeds specimens ; 
and since that time the name has adhered to the coal-measures 
species. It is evident that the name must be restored to the 
Scottish types. The latter were figured by Buckland in 1837,8 
partly under the name of M. Azbderti and partly as Holoptychus 
hibberti. Owen in 1841 ° imposed on these Scottish specimens 
1 Cat. Foss. Fishes, vol. ii, p. 261. 
2 Proc. Amer. Philos. Soc., vol. xxxvi, p. 82, Pl. I, Fig. 9. 
8 Palaos. Fishes N. Ao p. 119, Pl. XXVII, Fig. 33. 
4 Bull. Soc. Imp. Nat. Moscou, vol. xvii, p. 827. 
5 Ctenopdipt. Devon. Syst., p. 22. 
8 Trans. Roy. Soc. Edinb., vol. viii, pp. 169-282, Pls. V-XII. 
7 Poissons Foss., ci ii, pt. ii, p. 89, Pls. LXIII, LXIV. 
8 Geol. and Mineral., ed. 2, vol. ii, p. 43, Pl. XX VII. 
9 Odontography, at ip. 75 
