"230 MK. HAMSHAAV THOMAS OTST THE FOSSIL FL0BA OF [June I913, 



with small projections which give them rather a roughened aspect. 

 The usual tetrad scar is not seen on any example, but a single 

 straight scar instead, which doubtless indicates that the spores were 

 arranged in the spore mother-cells bilaterally and not tetrahedrally. 



The genus Marattiopsis has not yet received very critical study. 

 Schimper, under the old generic name of Ancfiopteridium, 1 dis- 

 tinguished a number of species which, according to bis account, 

 do not appear to differ very markedly one from the other. The 

 most definite are perhaps M. munsteri (the common Phaetic form) 

 and M. hoerensis from the Hor Sandstone (Liassic) and other beds 

 in Scania. The latter species differs from the common form in the 

 possession by the pinnae of an obliquely-cordate base, and also in 

 having longer synangia. 



The specimens now described are nearly allied to the above- 

 mentioned species, but approach closely to M.hcerensis in the size of 

 the pinnae and the length of the synangia; they do not, however, 

 appear to possess the obliquely-cordate base of the Swedish species. 

 At the same time, in many of the Yorkshire examples the synangia 

 are markedly different in size from those of M. hoerensis and still 

 more from those of M. munsteri. They are much elongated, and 

 extend across from the margin almost to the midrib. 



This character, together with the shape of the bases of the pinnae, 

 is probably sufficient to warrant the separation of the English 

 specimens from the Ehaetic type, and hence I have introduced the 

 name of anglica for the species just described. 



(ii) GYMNOSPERM^E. 

 Bennettitales. 



"WlLLIAMSONTA SPECTABILIS Xathorst. (PI. XXIY, figS. 1 a-3.) 



[' Paleeobot. Mitt. 9 ' K. Svenska Vetensk.-Akad. Handl. vol. xlvi (1911) No. 4, 

 p. 5 & pi. i, figs. 1-11.] 



Male sporophylls, identical with those described by Prof. Xathorst 

 from Whitby, are not uncommon at Marske. There are two or 

 three good specimens in the Piksmuseum at Stockholm, which were 

 collected by Dr. Halle and Prof. P. F. Kendall. Reference is made 

 to one of them in the original description, 2 and a still better specimen 

 is figured here (see PI. XXIV, fig. 2). The latter example 3 shows 

 .parts of two sporophylls, bearing several of the characteristic 

 synangia : these are situated at right angles to the length of the 

 sporophyll, and have the appearance of being borne on short 

 projecting branches. In 1911 I collected an interesting but still 

 fragmentary specimen (see PI. XXIV, fig. 1 a). The base of the cup 



1 Schimper (69) p. 603 & pi. xxxviii. 



2 Nathorst (11) p. 8. 



3 [Since this paper was written, this specimen has been figured and fully 

 described by Prof. Nathorst (12 2 ). Special emphasis is laid on the indications 

 that the fertile branches or pinnae were produced from the midrib, and not 

 .from the margins of the sporophylls.] 



