< ^6 MR. W. CARRUTHERS ON FOSSIL CYCADEAN STEMS 



Bucklandia \NOMALA, Presl, Tent. Mor. Primord. p. xxxiii. in Sternberg's Flora der 



Vom It (1825). (Tab. LIV. fig. 1-3.) 



I B22. " Stems of Vegetables/' Mantell, Fossils of the South Downs, p. 42. 



It ;. (Mat hr aria anomala, Stokes & Webb, Geol. Trans, ser. 2, vol. i. p. 423, pi. xlv. figs. 1 & 3. 



1827. C. Lyellii, Mantell, Geol. of Sussex, p. 52, pi. i. fig. 2; pt. ii. figs. 4 & 5. 



IH28, Cluthraria (gen. nov.) Lyellii, Brongn. Prodr. p. 126. 



Scan of the leaves subrhomboidal, the lateral angles more or less truncate, inferior and. 



acute, the superior obtuse or somewhat rounded. The surface of the scar in some 

 specimens marked with a triradiate ridge. The smaller scars oblong, with blunt 

 lateral angles, obtuse inferior, and slightly rounded, almost straight superior angle; 

 the scars equal in breadth to the larger ones, but not nearly so deep ; the cicatrix 

 on the appear margin. The bases of the leaves are set somewhat obliquely on the 

 stem, their upper margin following the direction of the right-hand spiral. Each 

 series of leaves occupies a considerable length of the stem. The phyllotaxy is repre- 



sent* (1 by the fraction 



Cuckfield, Sussex, Dr. Mantell. [British Museum and Museu 



pt name C, 



tical Giology.] 



The name given to this species was set aside by Mantell for 

 Lyellii, which he had applied to the fossil before the publication of Stokes and Webb 

 report, claiming, as he says, " the privilege of original discoverers to retain that specific 



designation."—^*. Suss. p. 52. 



IV M wtellii, sp. nov. (Tab. LIV. fig. 4.) 



ebb (in part), Geol 



o 



pi. xlvii. fig. 4 a. 



l«W. C. Lyellu, Mantell (in part), Geol. of Sussex, pi. ii. fig. 2; pi. hi. fig. 4 a. 



Bear, of the leaves rhomboidal, the lateral angles acute, the inferior and superior angles 



obtuse, the latter somewhat rounded. The small scars equal in breadth to the large 



ties and increasing in depth from the bottom of the constriction upwards. Each 



swelling of the stem bearing three or four series of leaves, the constricted portion 



much longer, and crowded with the smaller scars, forming twelve or fourteen ver- 



The bases of the leaves set horizontally on the stem. The phyllotaxy is 



tie;il 



represents by the f motion T -3 



the Hastings Sand at Cuekfield, Sussex, Dr. Mantell 



Museum.] 



aaJo^mtZ I!' 6 aX1 !' W ' ,ich Me more abuild »nt in the Imianodon-quarries than speci 



•'Xno^nf ,,!r;f r SUrfaCe ° f the St6m ' Camot ** *>e -fcrred to either species 



i>e rallies of th "T^ ™ ^ ^ *"* fonn ° f the swellin g s ( which are the caS " 



in «>< British M nZ™ u^^' W Seems P robaW e that the larsre series of these core- 

 museum coUeetion may belong to three 



I* -or.uro.SA, Bwngn. Prodl , p 12g ( 



g to three or four distinct species 



; f<> B„ckland,,, Stern. Flora dor v c 

 Omentum of Cycas/Miucklancl, Geol 



tab 



400 





