^> MR. VV. CARRUTHERS ON FOSSIL CYCADEAN STEMS 



Sp. 1. /?. Reichenbachiana >, Gopp.; cicatricibus petiolorum trigonis remotis angulis obtusis, cicatri- 

 colli inter eas in quincunce dispositis minutis subtrigono-rhomboideis. 



Form. Ignot&t Loc. Wieliezka, Gallicia. 



Sp. 2. R. Schulziana, Gopp. j cicatricibus petiolorum transverse subrhomboideis remotis an<nilis 

 lateral, bus acutis, superiore et inferiors obtusis, cicatriculis inter illas in quincunce positis subtrigonis 

 rhomboideis. 



Farm. Ignota. hoc. Gleiwitz, Silesia. 



I. BlCKLANDIA. 



Flor 



Mem. du Mus 



ls-28. ihicklandia, Brongn. Prodr. p. 128. 



bases of the leaves, which 



arranged in alternating series of large and small scars, the large being placed on swellings and the 

 small on constrictions of the stems. Andraecium a cone (?) . Gyncecium a terminal crown of leaves 

 bearing the seeds on their somewhat altered ma 



The name Clathraria was first employed by Brongniart in 1822 for a section of Stern- 

 ], (T rr' s genus Zepidodendron, differing from the group to which the name Sigillaria was 



ifVrwards applied in being without parallel furrows on the stem. Stokes and Webb, in 

 fcheb Report on Mantell's Vegetable Fossils from Tilgate Forest \ referred one of them to 

 Brongniart's Clatharia ; but, to indicate that they considered it very different from the 

 Lepidodendroid fossils included in that genus, they gave it the specific designation ano- 



»«lo. Presl, in the Revision of Fossil Plants prefixed to Sternberg's < Flora der Vorwelt ' 



1825), separated ManteU's Tilgate fossil from Brongniart's Clathraria (which he rightly 

 placed among the Cryptogamia), and established the genus Bucklandia for it, referring it 

 irith remarkable discrimination to Cycadece. Brongniart, in his ' Prodrome, ' in 1828, 

 permitted his original genus Clathraria to disappear in Sigillaria, but nevertheless re- 

 tained the name to designate a section of that genus in another work published in the 

 same year*. Notwithstanding this, he reintroduced the name in the < Prodrome' for a 

 new genu created for the Tilgate fossil, even although he was aware that Presl had 

 il ready sej rated it generically; for he quotes Bucklandia, Sternb., as a synonym of his 

 w gomn. This confusion is further increased by the adoption in the same work of 

 nnrkhnidu, for an Oolite fossil from Stonesfield, figured and described in Sternberg's 



Flora a. Condn Bveklandi, which Brongniart considered to be the type of a new genus 

 £Ued to, yd differ nt from, his new Clathraria. Both genera were referred by him to 



" '"; *, being compared to the stems of some arborescent members of that Order, 



especial to Xanftwrrhva. In 1849 3 he adopted Presl's interpretation, and placed 



them among the Cycadea:. * 



I nave examined the original and, as yet, only specimen of Sternberg's Conites Buck- 



-; 1- rved in the Oxford Museum, and am satisfied that it is truly Cycadean, and 



i rarest alhes are the plants referred to Clathraria. I therefore do not hesitate to 



' - Trans, ler. 2, vol. i. p 422 n-->4\ 



\ ,_ '* Histoire des Vegetaux Fossiles, vol. i. p. 430. 



Tabl. (k, Genr.de Veg.Foss. p. 91. 







