Mr R. Kidston on Pecopteris in Circinate Vernation. 123 



Hugh Miller has himself suggested the identity on a label 

 affixed to the specimen, although it is not so spoken of in 

 the work where it is figured. It may be remarked that the 

 figure shows a singular resemblance to that by Tate of the 

 smaller leaf Palmozamia Bitbidgei (Dioonites Bubidgei, Sch.) 

 from South Africa {Quart. Jour. Geol. Soc, vol. xxiii., p. 145, 

 pi. v., fig. 3). The likeness, however, disappears in the en- 

 larged drawing of a single leaflet of the latter. Palaeontolo- 

 gists are not agreed whether Ctenis is a cycad or a fern. 



With reference to the remaining figure in the " Testimony 

 of the Eocks " which bears the name of " Zamia " (p. 477, 

 fig. 134), it has to be remarked that, after describing the 

 Zamioid foliage, the author goes on to refer in some detail to 

 the group of simple-leaved ferns, including Tceniopteris, and 

 indicates his own belief that certain large Scottish specimens 

 which would usually bear this name may be truly Zamioid. 

 It is one of these, doubtless, which is figured, with the name 

 of " Zamia " attached, in this place, where it has apparently 

 been inserted in error by those who assigned to some of the 

 drawings their position and name after the author's death. 

 (See note prefixed to the work.) Its interpolation here 

 among the other four figures we have quoted (figs. 133, 135, 

 136, 137), representing plants mentioned in corresponding 

 order in the text, has confused the references to these ; and 

 we find further on (p. 484) that it is required to complete 

 the illustration of Tseniopteroid plants as there described. 

 Leaves of this kind are still included among ferns, especially 

 several of great size in the genus Macrotcenioptcris (Sch.). 



XL On a Specimen of Pecopteris (? polymorpha, Brongn) 

 in Circinate Vernation, with Remarks on the Genera 

 Spiropteris and Ehizomopteris of Schimper. By 

 KoBERT Kidston, Esq., F.G.S. [Plate V., Fig. 1.] 



(Read 19th December 1883.) 



Although the beautiful specimen which forms the subject 

 of this communication does not throw any additional light on 



