926 General Notes. 
having been previously given to a well-marked existing genus of 
Pleuronectids by Gottsche (1835). I did this, as indicated in 
my communication (p. 828), solely on the authority of Pictet, who 
believed that the Bucklandium was the same as Glyptocephalus 
Agass.,! the work of Koenig not being accessible to me at the time, 
and Prof. Pictet being recognized as a special authority on eocene 
fishes. But in the Geological Magazine for Oct., 1888 (p. 471), and 
also in The Annals and Magazine of Nat. History for Oct. (6 ser., v. 
II, p. 355), Mr. A. Smith Woodward, after an examination of the 
type of Bucklandium diluvii, “determined that it is truly the im- 
perfect head and pectoral arch of a Siluroid.” | Incredible as such a 
malidentification on the part of Pictet must appear, I presume the 
determination of Mr. Woodward must be accepted, and, at any rate, 
that the name Bucklandium has nothing to do with Glyptocephalus, 
Consequently, a new name must be provided for Glyptocephalus 
Agass. Glyptocara, having the same meaning, may be employed. 
—Theo Gill. 
Dr. C. A. White, of the United States Geological Survey, 
writes the senior editor as follows :—“ I have just returned from 
Texas. I went to Baylor, Archer and Wichita counties, and found 
that Mr. Cummins was entirely correct in his reported discovery of 
Mesozoic and Paleozoic types of invertebrates commingled in 
one and the same layer of the Permian. I went with him to his 
localities, and collected with my own hands a good lot of the fossils. 
I shall support your published opinion—or rather determination— 
as to the Permian age of the formation.” 
THE NOMENCLATURE OF THE MAMMALIAN MOLAR CusPs.— 
Every fresh discovery among the primitive mammals tends to con- 
firm the theory that the evolution of the molar crowns has been, 1n 
a succession of stages, beginning with the single reptilian cone, the 
homodont type of Riitimeyer (Haplodont Cope). Comparative 
anatomy and the paleontological record combine to demonstrate this 
Multituberculates and Edentates—the history of the teeth of the 
former classes is incomplete. Our knowledge of the edentates 
leaves it uncertain whether the molar crowns are in a primitive 2 
degenerate condition; we know that they once possessed eg ; 
but the analogical degeneration of the molar crowns among the 
cetacea from a complex to a primitive type makes any cone > 
to the crowns of the primitive edentates very doubtful. Exclu 
ing the representatives of the Multituberculata, Cope has shown 
1 Je crois que C'est [i.e., “Glyptocephalus radiatus Agass.’’] 1a mon 
espèce que celle qu’il a Avie date les Icones sectiles, pl. 8, sous e Lp 
de Bucklandium. Voyez [Traité de Paléontologie par Pictet], t. 4+) P- 
44, et t. II., p. 66 [et p. 123]. 
