Species. 79 



BU VISION OF THE GENUS CYGADEOIDEA 

 BUCKLAND. 



Genus Cycadeoidea Buckland. 



1827. Cycadeoidea Buckland, Proc. Geol. Soc, Lond. , Vol. 1, No. 8, pp. 



80-81 (Session of June H, 1827). 



1828. Cycadeoidea Buckland, Trans. Geol. Soc. Loud., 2 Ser., Vol. II, pp. 



375-401, pi. xlvi-xlix. 



This genus seems to be the ultimate destiny of all cycadcan 

 trunks of dwarf bnlb-like or conical form, deciduous leaf stalks 

 and rhombic leaf scars. Count Solms-Laubach has already re- 

 ferred many of the species of Bennettites and Clathropodium to 

 it, and the Marquis Saporta admits that one species of Bolbopo- 

 dium belongs to the same genus as C. pygimva. The fact alone 

 that fruit has been found in one species (C Gibsoni) seems in- 

 sufficient ground for retaining the genus Bennettites. The only 

 other name that has any claim to retention for this group is 

 Mantellia of Brongniart, but his publication of it at the same 

 date with Buckland's Cycadeoidea was a nomen nudum, and had 

 moreover been used for an animal fossil. It is therefore gener- 

 ally given up. Brongniart himself conceded this, but wrote 

 Cycadoidea on grounds of euphony. Even this cannot be al- 

 lowed by the now more and more strictly enforced rules of no- 

 menclature, and Gycadeoidea must stand as originally Avritten by 

 Buckland. 



Cycadeoidea megalophylla Buckland. 



1827. Cycadeoidea megalophylla Buckland, Proc. Geol. Soc. Lond., Vol. 



I, No. 8, p. 80. 



1828. Trans. Geol. Soc. Lond., 2d Ser., Vol., II, pp. 397-401, pi. xlvii, 

 figs. 1-4; pi. xlviii, figs. 1-a. 



1828. Mantellia nidiformis Brongn., Prodrome, pp. il6, 199. 

 1837. Mantellia megalophylla (Buckl.) Bronn, Lethaea Geognostica, p. 

 227, pi. XV, fig. 2. 



1837. Cycadites megalophyllus Buckland, Geology and Mineralogy, etc., 



Vol. I, p. 497 ; Vol. II, p. 98; pi. Ix, figs. 1, 2. 



1838. Zamites megalophyllus (Buckl.) Presl, in Sternberg's Versuch, etc., 



Vol. II, Hefte 7 and 8, p. 19G. 

 1842. Encephlartos Bucklandii Miquel, Monogr. Cycad., p. 60. 

 1849. Echinostipes nidiformis (Brongn.) Pomel, Matcriaux, etc., p. IH. 

 1874. Clathropodmm megalophyllum (Buckl.) Saporta, PI. Jurass., Vol 



II, p. 285, pi. Ixxvi, fig. 1. 



Purbeck beds. Isle of Portland, Dorsetshire, England, 



