THINNFELDIA. 27 



Chordophyllites represents what appears to be a stem with irregular 

 surface ridges or wrinklings, and gives one the impression of 

 a fragment of some soft plant which has undergone shrinkage. 



The other specimen, NulUporites, may be of animal origin, 

 and cannot be assigned with confidence to the Algae. In the 

 Whitby Museum there is another specimen of CJwrdophyllites- 

 identified by Tate and obtained from the Ammonites spinatui 

 beds at Staithes. 



The two species, Chondrites hollensis and Phymatodcrma 

 liassicum, included in "Woodward's list, are not represented in 

 the Museum collection ; the names were no doubt applied to- 

 specimens which belong to that large class of fossils assigned by 

 some writers to Algae and by others attributed to animal agency. 

 They may be regarded as valueless from a botanical point of 

 view. The doubtful origin of Moore's Chara, already mentioned, 

 prevents us accepting the record as trustworthy evidence of a 

 Liassic species of Charophyta. 



Class EQUISETALES. 



Genus EQUISETITES. 



? Equisetites Muensteri, Sternberg. 



V. 2092. A portion of a crushed stem, possibly referable to- 

 Equisetites Muensteri, Sternb., but too indistinct to determine with 

 confidence. 



Lyme Regis. Purchased, 1889.. 



Class FILICALES. 

 Genus THINNFELDIA, Ettingshausen. 



[Abh. k.k. geol. Eeichs. Bd. i. Abth. 3, No. 3, p. 2, 1852.] 



This generic name was instituted by Ettingshausen for some 

 specimens from the Lias of Steierdorf , and defined as follows : — 



"Rami teretes vel subalati. Eolia disticha, alterna oppositave, 

 rhomboidea, ovalia vel lanceolata vel linearia, flabellatim veL 

 pinnatim venosa." 



