h 



1907] JEFFKtlY—ARAUCARIOPITYS 443 



Its double system of bundles as having resulted from the fusion of 

 the two organs present in the Abietineae. If this be granted, it is 

 not easy to deny to the Abietineae a superior antiquity. 



SUMMARY 



1. Araucariopitys is an araucarian Conifer found in the Middle 

 Cretaceous Clays of Staten Island, N. Y. 



2. Its structure and its association with impressions of the leaf- 

 fascicles of Czekanowskia make it possible that it constitutes the 

 branches of that genus, which in such a case cannot be regarded as 

 belonging to the Ginkgoales. 



3. Araucariopitys was characterized by the possession of deciduous 

 shootSj which apparently persisted for a single year; by the charr 

 acteristic radial pitting of its tracheids, transitional between true 

 araucarian pitting and that found in the Abietineae; by rays differing 

 from the araucarian type and approximating the abietineous type; 

 by the formation of traumatic resin canals closely resembling those 

 found in the Abietineae. 



4. Araucariopitys, although unquestionably araucarian, was 

 nearer in structure to the Abietineae than any other known araucarian 

 genus living or extinct, and has been named in accordance with this 

 fact. 



5- Araucariopitys supplies additional evidence for the derivation 



of the Araucarineae from the Abietineae. 



Phanerogamic Laboratories 

 Harvard University 



EXPLANATION OF PLATES XXVIII-XXX 



PLATE XXVIII 



Fig. I. Transverse section of stem of Araucariopitys antericana, X30. 



Fig. 2. Transverse section of another specimen of the same. X18. 



Fig. 3. Transverse section of stem of Araucariopiiys americana from the 



h 



of the same. X40- 



same to show the traumatic resin canals 



80 



PLA TE XXIX 



afnertcana. Xioo 



<j - - - o 



Fig. 7. Tangential section of the same. X180. 



Fig. 8. Longitudinal approximately radial section of the same. X40. 



