

XLV] ELATIDES 271 



included by Nathorst 1 in Palissya Braunii but afterwards recog- 

 nised by him as a distinct species 2 and recently transferred to 

 Elatides 3 . An examination of specimens in the Stockholm 

 Museum leads me to agree with the substitution of the designation 

 Elatides. Nathorst has also pointed out that some of the cones 

 from the Rhaetic of Franconia referred by Schenk 4 to Palissya 

 Braunii are of the Elatides type and distinct from cones of Palis- 

 sya which are characterised by their more open habit and by 

 other more important morphological features. Elatides Sternbergii, 

 though similar in the habit of the vegetative shoots to E. William- 

 sonis from Jurassic strata, differs in the narrower and straighter 

 leaves which may reach a length of 2 3 cm. and are either straight 

 or slightly curved in contrast to the stouter and strongly falcate 

 leaves of E. Williamsonis and E. curvifolia. A cone figured by 

 Nathorst 5 is practically identical in external form with one of 

 E. Williamsonis illustrated in volume I. of the Jurassic Flora of the 

 Yorkshire Coast 6 . We have no knowledge of the structure of the 

 reproductive shoots and no evidence other than the habit of the 

 foliage-shoots with regard to systematic position : it is, however, 

 probable that this Rhaetic species is closely allied to the later 

 Jurassic and Wealden types. 



latides Williamsonis (Brongniart). 



This Jurassic species described by Brongniart 7 as Lycopodites 

 Williamsonis, was figured by Phillips 8 as L. uncifolius and by 

 Lindley and Hutton 9 under Brongniart's name. The specimens 

 figured by the English authors are in the York and Manchester 

 Museums respectively. Schimper transferred the species to Pachy- 

 phyllum and it has usually been assigned to that genus or to 

 Pagiophyllum 10 , the name substituted by Heer for Pomel's Pachy- 

 phyllum, a designation now reserved for sterile shoots and there- 

 fore inapplicable to the present species which possesses cones 

 of the Elatides type. The vegetative shoots are monopodially 



1 Nathorst (78 2 ) B. p. 28, PL iv. figs. 13. 



2 Ibid. (86) p. 107, PL xxm. figs. 812; Pis. xxiv., xxv. 



3 Ibid. (97) p 34; (08). 



4 Schenk (67) A. PL XLI. fig. 7. See also Solms-Laubach (91) A. p. 73. 



5 Nathorst (86), PL xxv. fig. 8. 6 Seward (00) B. PL x. fig. 3. 



7 Brongniart (28) A. p. 83. 8 Phillips (29) A. PL vm. fig. 3 



9 Lindley and Hutton (33) A. PL xcni. 10 Seward (00) B. p. 291. 



