436 Scientific Intelligence. 
adelphia, Dec. 1858, p. 223, Fig. 3,) with these Tertiary Sassafras species, 
and also with the Ettinghausenia, will satisfy every one that it is much 
more like the former and probably, therefore, is to be assigned to that 
genus. In relation to the separation of Ettinghausenia from Credneria, I 
did not intend to pronounce it in my letter to Mr. Lesquereux as unjustified. 
But Mr. Stichler certainly will willingly concede, that with the present 
Ettinghausenia. Dr. Newberry’s tate such a deviating form of leaf 
to this genus, proves the correctness of what I have said. Mr. Stichler 
has characterized excellently and circumscribed more strictly the genus 
Credneria, and separated from it a number of deviating leaves, which 
it is impossible to characterize in a satisfactory manner this group o 
leaves, which itself seems to embrace very different elements. Where- 
friendly scientific intercourse with him, and holding his works in the 
bigest esteem 
2. But if the Credneria and Ettinghausenia are now left out of the 
flora of Nebraska, and if the leaves so interpreted belong rather to the 
shee y 03 to a sein genera, the question may be put, on what 
unds the tion of Dr. Newberry be established: that these 
seit ah (Sete auialp to the Cretaceous species of the Old World ? 
As we remarked above, Dr. Newberry mentions besides Credneria and 
re aoa eleven other genera, to the list of which he afterwards 
adds Platan These are all, however, well known Tertiary genera and 
several of tthe bear an important part in the Tertiary flora. Two of 
them (Sphenopteris and Abietites) are not of any importance in this discus- 
sion, being present in nearly all the formations and therefore not pecu- 
rto any one of them; but this is not the case with the rest of them, 
Dr. Newberry now maintains, 1 oes several of these are contained in the 
work of Stichler (iber die ideflora des Hayes Palewontographica, 
v, 23), and puts the pote thee either I have not known the work - 
Stichler, and am, therefore, not competent to give an opinion upon it ; 
I have known it, and a severer expression would be justified. To ate I 
have to reply, that Mr. Stichler, in the work mentioned, describes only the 
era: Credueria, Butinghausenia, ¥ wens, Pandsann: Pterophyllum, 
rites, and mentions Salicites? fragili tah 4. and Juglans 
ent but in the intretio , (p. 50), he mentions, cot Mr. 
Hampe gives t lowing additional get rites, 
Getiinndie, Equ uisetum, Peeapteni, Flabellaria, Pinites, Geini itzia, Arau- 
