228 ME. HAMSHAW THOMAS OX THE FOSSIL FE0EA OF [June I9I3,. 



Todites wileiamsoni (Brongii.). (PL XXIII, fig. 6.) 

 [' Hist. Veget. Foss.' 1828, p. 324 & pi. ex, figs. 1-2.] 

 This form is represented by fragments of pinnse closely set with, 

 pinnules. The axes of the pinnse are in most cases broad, the 

 pinnules somewhat falcate, and in several specimens of a large 

 size (12 mm. long). The nervation is often clearly seen, and is of 

 the usual type, the secondary veins being mostly twice dichoto- 

 mized (see PI. XXIII, fig. 6). No fertile specimens are seen, but 

 I have recently obtained sterile and fertile pinnae from Gristhorpe 

 which have precisely the same form and venation as the examples 

 here described. Fertile pinnules of this longer form in the British 

 Museum have been also figured by Prof. Seward. 1 



Ceadophlebis denticelata (Brongn.). 



[' Hist. Veget. Foss.' 1828, p. 301 & pi. xcviii, figs. 1-2.] 

 A number of fragmentary specimens have been obtained which 

 undoubtedly belong to this species, although no very complete 

 examples have been found. Most of the pinnse are rather small, 

 falcate, and with once-bifurcated veins. One example shows the 

 apical portion of a frond, the pinnae of Avhich are set with short, 

 acute, contiguous pinnules which have secondary veins onco 

 bifurcated or simple. 



Maeattiopsis anglica, sp. nov. (PI. XXIII, figs. 1-5.) 



Xo specimens referable to the genus Marattiopsis have been 

 hitherto described from Yorkshire. 2 It is, however, a very common 

 Rhsetic and Liassic form, and has been recorded from Sweden, 

 Bornholm, Germany, Poland, and Tongking. 3 Eecently two in- 

 complete leaflets from the Jurassic (Kimmeridge) beds of Sutherland 

 have been placed by Prof. Seward in this genus. 4 Allied forms 

 from the Jurassic of Oregon have been described by Lester "Ward 

 and others under the old name of AngiopterkliumJ' 



A number of sterile and fertile pinnse (or pinnules) have been 

 found at Marske ; but, in some of the plant-beds at Eoseberry 

 Topping, they are extremely abundant, and formed in fact one of 

 the characteristic features of the vegetation. 



Most of the specimens are preserved in a fine-grained micaceous 

 sandstone, and consequently many details of their form are ob- 

 literated; some portions of pinnse have, however, been obtained 

 from the finer-grained shales and ironstone. All the specimens 

 found are portions of linear pinnse, having a width of 14 to 22 mm. 

 and a considerable length. The total length of a complete pinna 

 is unknown, but pieces about 30 cm. long have been obtained. 

 The apex probably was bluntly rounded, as seen in the apical 



i Seward (00) p. 94, fig. 12. 2 Seward (00) p. 309. 



3 Zeiller (02) p. 63. i Seward (11) p. 670 & pi. ii, figs. 28-29. 



5 Ward (05) pi. lxvi. . 



