XLIX] PROTOPHYLLOCLADTTS 415 



venation and to a large extent in shape the fossils conform to the 

 characters of Thinnfeldia. 



Protophyllocladus subintegrifolius (Lesquereux). 



This species was originally described by Lesquereux^ from 

 Dakota beds in Nebraska as Phyllocladus subintegrifolius. Heer^ 

 described similar or possibly identical specimens from the Atane 

 beds of Greenland as Thinnfeldia Lesquereuxiana and included 

 Lesquereux's name as a synonym: these Greenland specimens 

 reach a length of 8 cm. and a breadth of 2 cm. Heer classes the 

 species among plants of uncertain position and compares the 

 impressions with the phylloclades of Phyllanthus. The species is 

 recorded by Hollick* from Martha's Vineyard and other localities, 

 by Berry* from the Raritan flora, and as Thinnfeldia Lesque- 

 reuxiana by Newberry and Hollick^ from the Amboy clays and 

 other Cretaceous floras*: most of the examples are detached leaves 

 (or ? phylloclades), linear, spathulate, or ovate with an entire or 

 toothed margin while a few are branched (fig. 798, A, B). In no 

 single case is there any evidence in favour of regarding the speci- 

 mens as phylloclades rather than leaves. Until additional facts 

 are obtained it would seem preferable either to retain the generic 

 name Thinnfeldia used by several authors or to adopt some title 

 which does not suggest a relationship to any recent genus. Zeiller^ 

 has described a specimen from the Great Oolite of Marquise 

 (N. France) as Protophyllocladus sp. : this is the first European 

 record for Berry's genus. 



A similar species is represented by Protophyllocladus polymorphus 

 (Lesq.) first described by Lesquereux^ from Vancouver Island as 

 Salisburia polymorpha and afterwards transferred by Knowlton' 

 to Thinnfeldia. Another closely allied type is Protophyllocladus 

 lobatus Berryi" from Upper Cretaceous rocks in South Carolina. 

 Some of these supposed phylloclades closely resemble flattened 



1 Lesquereux (74) p. 54, PI. i. fig. 12. 



2 Heer (82) i. p. 37, PI. XLiv. figs. 9, 10; PI. XLVI. figs. 1—12. 



3 Hollick (06) p. 36, PI. v. figs. 1—6. « Berry (IP) p. 98, Pi. ix. 

 5 Newberry and HoUick (95) p. 59, PI. XI. 



« Lesquereux (91) Pi. II. figs. 1—3. ' Zeiller (12) p. 13. 



» Lesquereux (78) B. p. 84, PI. LX. figs. 40, 41. 

 " Knowlton (93) p. 47, PI. v. figs. 1^; Berry (03) B. p. 442. 

 '" Berry (03) B.; (14) p. 17, PI. il. figs. 9—13. 



