o44i 



PTERIDOSPERMS, ETC. 



[CH. 



in referring to Schenk's view that Thinnfeldia and its allies 

 may represent a group intermediate between Ferns and Gymno- 

 sperms, admits that it is a possible supposition ; he is, however, 

 inclined to consider Lomatopteris and Cycadopteris, "genera 

 especially comparable with Thinnfeldia," as more probably 

 ferns. 



At this point we may conveniently consider a series of 

 genera which occupy an equally uncertain position and bear 

 a very close resemblance to Thinnfeldia. 



B 



Fig. 360. A. Lomatopteris jurensis. (^ nat. size. After Kurr.) 



B. L. Schimperi. (J nat. size. After Salfeld.) 



C. Thinnfeldia rhomboidalis, Ett. (Slightly enlarged. 

 Museum. No. 52672.) 



British 



Lomatopteris. 



The generic name Lomatopteris was proposed by Schimper^ 

 for some bipinnate fronds originally described by Kurr- from 

 Jurassic rocks of Wtirtemberg as Odontopteris (?) jurensis 

 (fig. 360, A). I have elsewhere expressed the opinion^ that 

 this German species may be identical with Thinnfeldia rhom- 

 boidalis Ett. Kurr's type-specimen, a portion of which is 

 reproduced in fig. 360, A, consists of a frond or large pinna 



1 Schimper (69) A. p. 472. 

 - Seward (04) p. 30. 



2 Kurr (45) PI. ii. fig. 1. 



