IHrN-NEELDIA. 97 



to Ms new genus Stenopteris, including the English, plant, wticb 

 he eiToneously states' was obtained from the Inferior Oolite of 

 Yorkshire, with Preneh specimens in a new species Stenopteris 



The Stonesfield material is too fragmentary to he described as 

 a new species. Some of the examples appear to be identical with 

 the Steierdorf plant named by Ettingshausen Thinnfeldia speeiosa, 

 a species from a somewhat lower geological horizon than the 

 Stonesfield Slate. Th6 resemblance between Ettingshausen's 

 type-specimen and some of the Stonesfield examples is so close 

 that they may well be specifically identical, but while hesitating 

 to definitely adopt his name, I feel that no useful pm-pose would 

 be served by referring the English material to a distinct species. 



A specimen in the Oxford Museum differs from any in the 

 British Museum in having rather longer and narrower ultimate 

 segments, but it is undoubtedly specifically identical with those 

 figured on Plate X. 



"We may thus describe the Stonesfield plant: — Fronds bipinnate ; 

 strong rachis, giving ofi linear pinnules which may reach a length 

 of 4'5 cm., but are usually shorter, agreeing in size, shape, and 

 venation with Thinnfeldia speeiosa as figured by Ettingshausen. 

 The pinnules are traversed by a well-defined midrib from which 

 lateral veins extend obliquely to the edge of the lamina. At the 

 apex of the pinnae the pinnules are replaced by a terminal lobed 

 lamina with oblique veins (PI. X. Fig. 1). 



V. 4074. PL X. Fig. 1. 



Imperfect pinna, 1 1 cm. long, showing the terminal lamina and 

 linear pinnules with a distinct midrib and indications of the lateral 

 veins. The pinnules are decurrent on the stout rachis by their 

 lower margin. 



Stonesfield (?). 



V. 3422. PI. X. Fig. 2. 



The rachis is represented by a groove with winged borders 

 formed by the decurrent laminae of the pinnules. Each segment 

 has a distinct midrib and secondary veins. Buckman's Salicites 



' Saporta (73), p. 292. 



