Vol. 69.] THE CLEVELAND DISTRICT OF YORKSHIRE. 251 



Plate XXV. 



Fig. 1. Nilssonia orientalis Heer. Narrow form of frond with entire margin. 

 (See p. 241.) Natural size. 



2. Sagenopteris phillipsi var. major, Seward. Outline of a very large 



leaflet. (See p. 226.) Natural size. 



3. Baiera longifolia Pomel. Specimen showing the large size of the leaf. 



(See p. 243.) Natural size. 



4. B. longifolia. Specimen showing the long undivided basal portion of 



a leaf. Natural size. 



Plate XXVI. 



Pseudoctenis land, sp. nov. Specimen in the York Museum, from 

 near Scarborough, showing tbe form of the frond. See p. 243.) 

 Natural size. 



Discussion. 



The President (Dr. A. Strahan) remarked that the paper was 

 based on material collected by Mr. Lane, Mr. Thomas, and others 

 during many years of patient search, and he complimented 

 Mr. Thomas on the good use that he had made of the collections 

 at his disposal. 



Mr. G. Barrow remarked on the special value of the plants from 

 Marske, as their Lower Estuarine age was undoubted. The large 

 collections made in early days were obtained mostly from Gris- 

 thorpe, and are of Middle Estuarine age. Between Whitby and 

 Scarborough many specimens have been collected, of which the 

 exact age is not known ; they may be either of Middle or of Lower 

 Estuarine age. 



In the northernmost outcrops of the series, the Middle Estuarine 

 beds occur only in a portion of Eston Hill, and the speaker hoped 

 that plants would be found here, in order to ascertain whether there 

 are any differences between them and those from Gristhorpe ; 

 there is a considerable difference between the strata at the two 

 localities. 



Mr. Thomas, in replying, thanked the Eellows for the kind 

 attention bestowed on the paper. He remarked that all the speci- 

 mens described, as well as those which he had recently collected 

 in Yorkshire, were found in situ, and that their exact horizon could 

 usually be accurately determined. 



