56 E. Hitchcock on Fossil Footmarks of the Connecticut Valley. 
which my mind was coming. His reply hae too much good 
reasoning and important suggestions to be and I venture, 
without his leave, but trusting he will wastiae ei to annex his 
remarks to this paper. 
‘* New Haven, Feb. 7th, 1863. 
My Dear Sir :—Your new results from recent researches amon 
the necks of the Connecticut valley are of great interest, me 
should be glad to put your conclusions, when you are ready with 
on, in the J ournal, I am satisfied that we cannot infer the 
Ctenoids an T Brciide— —the Marsupial from iat Mammals 
—and Amphibians (or Batrachians) from true Reptiles. You 
normal sick related to the class next below. This ret 80; 4 
wide ve of form in the abnormal group are to : 
looked for 
Cryptogams, that is, the Acrogens, of which the Fern is the typit 
cal group, (2) the lowest Pheenogams, the Conifers, and (3) inter- 
mediate (or comprehensive) types in each class, Lep idodendra of 
the Lycopodium tribe, a type coniferous in habit, wae Sigillarie — 
of the Phzenogams, also intermediate between Conifers (in the 
Gymnosperms) and the Lepidodendra. By such an a 
the flora was rendered remarkably harmonious. Had the pro- 
ess of life consisted in an advance of Cryptogams to Vo 
ong with the introduction of Conifers, it would have been far 
aa 
n, (1 1) the gm fishes (Ganoids), @) and dic sb ke 
ian Betas (Ma Eosaurus) made up a harm 
assemblage of animal Me si the Carboulleren age. Ags sw 
semi-oviparous ours (Marsupials) along with oviparous 
Reptiles, &c., were in harmony with one another; and if true 
non-marsuy IL inesivores Ea eracal sine, yas ll ic barns 
the seers wore mainly Insec oreover the 
r were. pf she tighee. development of the Mane 
