SiGENOPTEEIS. 165 



PI. XVII I. and Text -fig. 24, I believe it is the better plan to 

 molade all under one specific name, and as a matter of convenience 

 to refer to the very small and very large forms as Sagenopteris 

 PhilUpsi, var. euneata, and S. PMllipsi, var. major, respectively. 

 Such a method of designating by descriptive varietal names extreme 

 types of leaves vrhich may be connected by a fairly complete series 

 of transitional forms, and which there is no sufficient reason for 

 referring to as to distinct species, may in some cases prove 

 convenient. 



The English species of Sagenopteris, 8, PhilUpsi, difFers from 

 S. rltoifolia and from S. Goeppertiana chiefly in the longer and 

 narrovrer form of the leaflets, but the larger type of leaf such 

 as that shown in Text-fig. 26, and the intermediate forms repre- 

 sented by fig. 1, pi. Ixiii. of Lindley & Hutton (No. 39,221 in the 

 Museum Collection), agree very closely with Schenk's figures of 

 8. rhoifolia,^ and with those given by Zigno of 8. Goeppertiana? 

 The specimens from Australia, figured by Feistmantel as 8. rhoifolia,^ 

 are very similar to many of the forms of 8. PhilUpsi. In a letter 

 written by Bean* to Lindley in 1832 accompanying the di-awings 

 afterwards published in the Fossil Flora (pi. Ixiii.), the broader- 

 leaved form is named Pecopteris Dunnii, but this designation, like 

 many of Bean's manuscript names, was never adopted. Some of 

 the narrower -leaved forms of 8, PhilUpsi may be compared with 

 JS. angmtifolia, Zigno," and with 8. undulata, Nathorst.* 



A fragment recently figured by Shirley from Queensland as 

 Sagenopteris euneata ' is too small for accurate determination. 



39,322. Text-fig. 24. Also Lindley & Hutton, Fossil Flora, 

 pi. Ixiii. fig. 2. 



In this specimen there is a petiole 3'7 cm. long, bearing four 

 linear lanceolate segments in which the midrib is well marked 

 and the lateral anastomosing veins stand out very clearly. The 



1 Schenk (67), pi. xii. 

 ^ Zigno (56), pi. xxi. 

 ' Feistmantel (90), pi. xxviii. 



* My thanks are due to Professor Lebour, of Xewcastle, for giving me access 

 io this letter. 



« Zigno (86), pi. XX. fig. 1. 

 '• Nathorst (78'), pi. xix. fig. 2. 

 ' Shirley (98), pi. xxiii. p. 24. 



