Vol. 69.] THE CLEVELAND DISTRICT OF YORKSHIRE. 227 



these 011 the coast between Cloughton "VVyke and Hayburn "Wyke ; 

 the species is also common at Gristhorpe. 



DlCTTOPHYLLUM RTTGOSTDI Lindl. & Hutt. 

 [Toss. Flor.' vol. ii (1833-35) pi. civ.] 

 This species is represented by some small fragments of fronds 

 found in the grey shale. These fragments show parts of the lobed 

 frond-segments with anastomosing venation of the usual type, and 

 are very characteristic. 



Stachypteris hallei Thomas. 



[Proc. Cambridge Phil. Soc. vol. xvi (1912) p. 610.] 

 1 obtained in tbe grey shale a few good examples of this fern, 

 which previously was only known from a single specimen found 

 by Dr. Halle at Whitby. They show some young fertile portions in 

 which the sporangia are apparently covered with scale-like indusia, 

 and yielded the characteristic reticulate spores. Reference may be 

 made for details of this form to the description which I have 

 recently published. 1 



•Cokeopteris hymenothylloides (Brongn.). 

 [' Hist. Veget, Foss.' 1828, p. 189 & pi. Ivi, fig. 4.] 

 Many fragments of fronds of this species have been found. Some 

 of them are badly preserved, but others show clearly the usual 

 characters of this common form. In the grey shales a fragment 

 of a fertile pinna has been found, which shows Tympanophora 

 characters and may have belonged to this species. 



Coniopteris quinqheloba (Phillips). 



['Illustr. Geol. Yorks. pt. 1— The Yorkshire Coast ' 3rd ed. (1875) p. 215.] 

 The identification of finely-divided fronds of the C'oniopteris type 

 is a matter of considerable difficulty at present. Phillips described 

 and figured two forms as Sphenopteris quinqueloba and Sph. arbus- 

 cula, which apparently are closely allied 2 ; but the fertile fronds of 

 these forms are not definitely known. The pinnules of C. hymeno- 

 pliylloides are very polymorphic, and the finely-divided foliage may 

 even be a form of this species. In the present case I have found in 

 the grey shales several small portions of tripinnate or quadripinnate 

 fronds with very finely-divided segments well preserved. These 

 may be provisionally associated with C. quinqueloba, although the 

 possibility of their being sterile fronds of Stachypteris hallei must 

 not be overlooked. They are, however, more finely divided than 

 the fertile fronds of the latter, and it is usually the lamina of the 

 fertile fronds which is the more reduced. 



1 Thomas (12 2 ). 



2 Seward (00) p. 112. 



