ANOMOZAMITES. 91 



Anomozamites-like leaves with dichotomizing veins. We must, 

 then, somewhat modify Schimper's original diagnosis, and the 

 following may be adopted as a rough definition of this provisional 

 genus Anomozamites ; it is a slightly altered version of that in 

 Zittel's Handluch. 1 



Frond comparatively small, linear or tongue-shaped, and usually 

 divided into segments which present a more or less obvious 

 difference in size, separate or confluent at the base, attached 

 laterally to the rachis, and never entirely covering the upper 

 face of the frond axis ; the segments bluntly rounded or truncate 

 distally ; veins simple and parallel, generally at right angles to 

 the rachis. 



The examples of this genus possess, as a rule, a characteristic 

 habit which marks them off from the pinnate fronds of Ptero- 

 phyllum with their equal and longer segments. It is difficult in 

 some cases to distinguish between the genera Anomozamites and 

 Nilssonia. In the former the segments are sometimes attached 

 to the rachis in such a manner as to suggest the surface insertion 

 of Nilssonia, but there is always some part of the frond axis 

 exposed to view, whereas in Nilssonia the lamina appears to be 

 continuous from one side to the other. It is not easy in the 

 present instance to decide whether the genus Pterophyllum or 

 Anomozamites is the more suitable ; both are purely provisional 

 genera, and it is not a matter of very great importance which 

 term is adopted. 



Anomozamites Lyellianus (Dunk.). 



[Fig. 6.] 



1846. Pterophyllum Lyellianum, Duiiker, "Wealdenbildung, p. 14, pi. vi. figs. 

 1 and 2. 



1848. Pterophyllum Lyellianum, Bronn, Index, pal. nomencl. p. 1056. 



1849. Zamites Lyellianus, Brongniart, Tableau, p. 107. 



1850. Pterophyllum Lyellianum, Unger, Gen. spec, plant, foss. p. 290. 



1851. Dioonites Lyellianus, Miquel, Tijdsch. Wis. nat. "Wet. iv. p. 205. 



1852. Pterophyllum, Lyellianum, Ettingshausen, Abb. k.-k. geol. Eeicbs. 



vol. i. Abtb. iii. No. 2, p. 22. 

 1856. Dioonites Lyellianus, Bornemann, Organ. Rest. Lettenkohl. p. 56. 



1870. Pterophyllum Lyellianum, Scbimper, Trait, pal. ve'g. vol. ii. p. 137. 



1871. Pterophyllum Lyellianum, Schenk, Pakcontograpbica, vol. xix. p. 230, 



pi. xxxiv. figs. 1 and 2. 



1 p. 224. 



