11 



PHANEROGAMS. I 5 37 



Larix (Larch), Cedrus (Cedar), &c, but the generic determination 

 of many fossil types is extremely difficult, and we can only state here 

 that the group as a whole has undoubtedly existed from the Jurassic, 

 and may not improbably date from the Lias or Rhsetic. Finally, 

 the family position of the imperfectly known Rhaetic genus Campto- 

 phyttum cannot at present be determined. 



Order 3. Gnetace^e. — This small order, represented by the 

 genera Ephedra, Gnetum, and Wehvitschia, is not certainly known 

 to be represented in a fossil state, although several forms have been 

 referred to the first-named genus. 



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i 



