226 ADDENDA TO VOL. I. 



genus Thinnfeldia, that lie made no reference to the resemblance 

 of the leaves to the genus 8agenopteris. Velenovsky's error 

 was pointed out to him by JS'athorst, 1 with the result that he 

 afterwards acknowledged his mistake, 2 a correction which I un- 

 fortunately overlooked. 



CANADA. 



Sir "William Dawson has pointed out to me, that I appear to 

 have done injustice to Canadian geologists in the brief notice 

 of the Kootanie plant beds in Vol. I. p. xxxi. 3 It was not 

 my intention to give a complete historical sketch of these 

 Cretaceous deposits, but I am glad to take the opportunity of 

 calling attention to a paper by Dawson On the Correlation of 

 early Cretaceous Floras in Canada and the United States, and on 

 some new plants of this period. In this contribution we have a 

 summary of the work of Richardson, G. M. Dawson, and others, 

 and a description of some new plants from the Kootanie forma- 

 tion of the Rocky Mountains. After giving a list of Kootanie 

 species, Dawson discusses the age of the flora, and points out 

 that while some of the plants must be regarded as Jurassic, the 

 majority have a Lower Cretaceous facies. On the whole, he 

 concludes that " the Kootanie flora belongs to the lowest portion 

 of the Cretaceous, and may be a little older than that of the 

 main part of the Potomac formation." * 



Among the plants described by Dawson we find the following 

 ^Yealden forms : JEquisetites Lyelli, Mant., Pecopteris Broivniana, 

 Dunk., Sphenolepidium, sp. The pinna figured as Pecopteris 

 Erowniana, is very imperfectly preserved, and does not afford 

 very satisfactory proof of the occurrence of Dunker's Wealdeu 

 species in the Kootanie flora. In another form, Cladophlebis 

 falcata, Font., we have one of those ferns which it is very 

 difficult to separate from the widely distributed C. Whitbyensis 

 (Brong.) and C. Albertsii (Dunk.). The fragment figured as 



1 Letter, June 25, 1894. 



- Velenovsky (A. 2), Abh. k. bolim. Ges. Wiss. vol. ii. 1888, p. 5. 



3 Letter, Oct. 17, 1894. 



*. Dawson (2), p. 93. 



