lo Skw. \RD, /u7'assic Plants in the Mavxhester Museum. 



identical with P. dcnticiilata of Brongniart The specimens 

 referred byl'hilHps and byL.indlcyand Ilutton \.o Pccopteris 

 rccentior differ from Bron(;niart's P. Willianisonis in their 

 larger and longer pinnules, but an examination of several 

 large fronds in various collections has con\inced mc of the 

 identity of the two forms. 



The specimen shown in pi. i., fig. i [ = pl. cl.xi.x. 

 (upper figure) of Lindley and Button] has a length of 

 7 cm., and represents the apical portion of a frond 

 bearing linear pinnee with crowded deltoid and slightly 

 falcate pinnules, having a serrated margin. In the larger 

 pinnules there is a fairly well marked midrib, from which are 

 given off forked and spreading lateral veins. Williamson's 

 drawing gives a fairly accurate idea of the specimen, but 

 the pinnules are broader and less sharply pointed than as 

 shown in the figure given by Lindlc)^ and Hutton. The 

 type-specimens were obtained by Williamson from Gris- 

 thorpc ]^a)-, and forwarded to Lindley with a descriptive 

 note, in which they are compared with Pecopteris 

 Whitbicnsis, P. Jiastata, P. ligata, and /''. dcnticulata. 



In the specimen represented in pi. i., fig. 2, the rachis 

 measures 9-5 cm. in length, and 2 mm. in breadth. The 

 pinnre, of which portions only are preserved, have the 

 same uniform breadth as in the example shown in fig. I ; 

 the pinnules are closely set and approximateh' at right 

 angles to the pinna axis, and arc linear and slighth' falcate 

 with a serrate apex, which points towards the tip of the 

 ])inna. In Williamson's drawing the pinnules are some- 

 what inaccurately represented ; they are characterised by 

 a more deei)ly concave outer margin, and a more convex 

 inner margin than the drawing in the Fossil Flora 

 indicates. The lateral veins are given off from the midrib 

 at a more acute angle than as shown in the drawing. 



The most striking features in the two specimens 



