CTENOPIEEIS. 35 



52,751. PI. IV. Fig. 3. 



The specimen, of which a portion is represented in the figure, 

 is 15 cm. in length. The longer segments reach a length of 3 cm. ; 

 the lamina of some of them has a slightly lobed margin.' The 

 upper edge of the pinnule bends sharply downwards at the base, 

 forming a deep sinus, while the lower margin of the lamina is 

 decurrent on the raohis. 



Lyme Eegis. Purchased, 1874. 



40,674. Text-fig. 2 (one and a half times nat. size). In this 

 smaller frond there is no midrib in the pinnules, the branched 

 veins spreading from the base of each pinnule. 



Lyme Regis. Purchased, 1859. 



V. 17. A specimen 10 cm. long, with a petiole 1'7 cm. in length, 

 terminating in a slightly swollen base. 



Lyme Eegis. Purchased, 1881. 



Other specimens :—Zb,Q'^%, 38,350, 38,351, 52,510, 52,858. 



Lyme Eegis. Purchased, 1856-76. 



PLA.NTA INCEET^ SEDIS. 



Genus CTBNOPTBRIS, Saporta, ex MS. Brongniart. 

 [Saporta, Pal. Fran^. toI. i. p. 351, 1873.] 



In my former volume '' on Jurassic plants I adopted ITathorst's 

 generic name Ptilmamites for the Inferior Oolite species originally 

 named by Zigno Odontopteris Leclcenhyi, and afterwards referred 

 by Leckenby to the genus Ctenis and by Nathorst to Ptilozamites. 

 The designation Ctenozamites of Nathorst was added as a sub- 

 generic title for bipinnate, as distinct from pinnate, fronds of the 

 Ptilozitmites type. 



It is a matter of secondary importance whether we adopt the 

 names Ptilozamites or Ctenozamites of Nathorst, or revert to 

 the older genus Ctenopteris. Professor Zeiller, in his admirable 

 EUments de PaUoloianique, makes use of Ctenopteris, and it may 



' Compare Zigno (36), pis. xvii.-xviii. 

 2 Seward (00), p. 237. 



