92 ANOMOZAMITES. 



Type. Large specimens of frond. Berlin Museum. 



Danker thus defines the species in his Wealdenbildung : 



" Pterophyllum fronde pinnata, pectiniformi, pinnis oppositis 

 linearibus aeque distantibus, approximatis basi fere confluentibus, 

 apice obtusis, angulo recto adnatis, nervis iv. vel v. tenerrimis, 

 rhachi plana subsulcata." 



The figure of Bunker's type specimen is very much more sug- 

 gestive of the genus Pterophyllum, than are the drawings given by 

 Schenk, or that of the solitary specimen in the Rufford Collection. 

 Probably the original specimen is part of a frond seen from the 

 under surface, thus showing a particularly prominent rachis. It 

 may be that the English fossil should be placed in a new species, 

 but the apparent differences which distinguish it from Dunker's 

 specimen may be merely such as are the result of a more fully 

 developed condition of frond in the latter case. Possibly Zamites 

 cequalis, Dunk., 1 should be included in this species. Schenk's 

 figure agrees more closely with the English specimen : this author 

 speaks of the segment as being attached to the upper surface of 

 the rachis, and not laterally inserted ; if this were really the case, 

 the genus Pterophyllum as usually defined would be inapplicable. 

 Schenk's example does not show the rachis sufficiently clearly 

 to definitely settle this point, but in all probability, as in our 

 specimen, there is a narrow line of axis separating the two rows 

 of segments. A close inspection of Schenk's figure enables us 

 to detect certain slight differences in the breadth of the pinnae, 

 similar to those in the Ecclesbourne specimen. It must be 

 remarked, however, that there is very little difference in the 

 breadth of the several segments. There is a striking agreement 

 as regards general appearance and arrangement of the segments, 

 between the Wealden specimen and the Jurassic species Anomo- 

 zamites Nilssoni. Lindley and Hutton 2 figured this plant as 

 Pterophyllum Nilssoni (Phill.) : from their figure it is not easy to 

 decide between Nilssonia or Anomozamites as the most suitable 

 genus, but an examination of several specimens of this species 

 from the Yorkshire coast, shows very clearly the characteristics 

 of the latter genus. There are several examples of this form in 



1 Wealdenbildung, pi. vi. fig. 3. 



2 Lindley and Hutton (A.), Fossil Flora, vol. i. pi. Ixvii. fig. 2. 



