CTATHEACE^. 97 



14,202. A good specimen preserved in ironstone ; the rachis is 

 1 cm. broad, and the longest pinna reaches a length of 18 em., with 

 large pinnules similar to those of V. 3655, etc. 



Near Scarborough. 



39,231. Part of a very large frond; rachis 1'4 cm. broad, with 

 long spreading pinnse 2'5 cm. in breadth ; the pinnules are almost 

 at right angles to the pinnae, and the pinnae of the lower part of 

 the specimen are also approximately at right angles to the rachis. 

 Labelled by Bean Peeopteris hastata, Phill. 



Upper Shale, Cloughton "Wyke. £ean Coll. 



39,271. A fertile frond with a rachis 1-2 cm. broad. Short 

 and stumpy pinnules bearing sporangia, as in the specimen shown 

 in PI. XV. Fig. 1 (13,491). 



39,277. This form of frond, with large pinnules l'6cm. long, 

 bears a distinct resemblance to Cladophlehis denticulata, but the 

 pinnaj are more crowded, the frond has a less open habit, and 

 the segments are broader at the base. One pinna has a length 

 of 23 cm. 



Gristhorpe. Bean Coll. 



Other specimens:— Y. 2520, V. 2527, 8250, 13,505, 39,228, 

 39,262 (labeUed by Bean Peeopteris curtata), 40,468, 40,469. 



Several examples of this species are included in the collections 

 of Yort, Scarborough, Whitby, Manchester, and other places. 



Family CYATHEACE^. 



It is not always an easy matter to draw a satisfactory 

 distinction between fossil ferns which exhibit the characters of 

 the Cyatheacese, and those which should be compared with some 

 recent species of Dcwallia. While admitting with Nathorst that the 

 genus Davallia was probably represented in the Jurassic vegetation 

 by near allies, I have been led to conclude that the Cyatheaceee 

 played a prominent part in the fern floras of the Mesozoic period. 



