CYCADIIES. 37 



cycadea. Portions of a large frond recently figured by Zeiller from 

 the Ehaetic of Tonkin as Ctenopteris Sarraini, Zeill.,' represent 

 another example of the genus. 



40,674. PL III. Figs. 1, la. 



Part of a bipinnate frond ; a broad and flattened rachis gives 

 ■off pinnate branches bearing ultimate segments attached by the 

 whole of the base and traversed by several forked and slightly 

 spreading veins. The pinnules are approximately I'Scm. long 

 and 8 mm. broad. 



Lyme Eegis. Furchased, 1859. 



Class CYCADOPHYTA. 



This class-designation recently proposed by Nathorst ' serves 

 a useful purpose, and forms a vrelcome addition to botanical 

 nomenclature. In a great number of cases we are without the 

 means of referring fossil Cyoadean fronds either to the Bennettiteae 

 or to the Cyoadacece, the chief difference between the two sections 

 being afforded by the morphological characters of the reproductive 

 organs. It is, therefore, a convenience to make use of a designation 

 which includes both the true Cycads and the extinct Bennettitacese. 



Genus CYCADITES, Sternberg. 

 [Flor. Vorwelt, iv. p. xxxii. 1825.] 



Cycadites rectangularis, Brauns. 



[PaliEontogr. Bd. ix. p. 56, pi. xiv. fig. 1, 1862.] 

 (PI. IV. Pigs. 4, 4a; PI. II. Pig. 1 ; Text-fig. 3.) 



1832. Cijcadites pectinatus, Berger, Verstein. Coburg, p. 23, pi. iii. fig. 4. 



1862. C. reetangularis, Brauns, Palfeontogr. vol. ix. p. 56, pi. xiv. fig. 1. 



1863. Cf. C. rajmahalemis, Oldham & Morris, Gondwana Flor. pis. vii.-viii. 

 Cf. C. conferta, ibid. 



1867. C. reetangularis, Schenk, Plor. Grenz. p. 157, pi. xxxv. fig. 11. 

 1870. C reetangularis, Schimper, Trait, pal. veg. vol. ii. p. 178. 

 C. pectinatus, ibid. p. 178. 



1 Zeiller (02), pis. vi.-viii. 

 ' Xathorst (02), p. 3. 



