670 PROFESSOR A. C. SEWARD ON 



C. Roesserti groenlandica * agree closely with the Culgower specimens bearing broader 

 pinnules, and C. Stewartiana Hartz is hardly distinguishable from the example re- 

 presented in PL VI. fig. 9. The specimens described by Yokoyama from Wealden 

 beds in Japan as C. Nathorsti^ are probably pieces of C. denticulata. In recording 

 the occurrence of C. denticulata in Jurassic rocks in the Caucasus | I incorrectly referred 

 to a specimen, described by Yokoyama from the Jurassic of China as Todites 

 Williamsoni, as being C. denticulata, without noticing that the secondary veins are 

 more than once forked : the China species may be identical with C. Raciborski Zeill. 

 from the Rhsetic of Tonkin ; it is certainly not Todites. 



6. Marattiaceae. 



Maeattiopsis, Schimper. 



Marattiopsis Boweri sp. nov. (PI. II. figs. 28, 29.) 



The incomplete leaflet shown in fig. 29 is characterised by a fairly broad midrib 

 which gives off single or forked lateral veins at a wide angle, and by the occurrence of 

 marginal sori. Although no sporangia can be recognised, I have little doubt as to 

 the close relationship of this and similar pinnules to recent Marattiaceous ferns. The 

 sterile fragment represented in fig. 28 probably belongs to the same species : the 

 lateral veins are obscure, though it is clear that they were more numerous than in 

 the pinnules of such a species as Cladophlebis denticulata, from which they differ also 

 in the thinner lamina, which in most of the few examples met with is more or less torn. 

 It is unfortunate that the material on which this species is founded is not more 

 satisfactory, but despite the imperfection of the specimens I venture to regard the 

 pinnules as those of a Marattiaceous fern probably distinct from species hitherto 

 recorded. The well-known Rhsetic species M. Muensteri (Goepp.) and Angiopteridium 

 californicum Font, from the Jurassic flora of Oregon bear a resemblance to the 

 smaller Culgower type. § 



7. Ferns of Uncertain Affinity. 



Cladophlebis, Brongniart. 



Cladophlebis sp. cf. C. haiburnensis (Lind. and Hutt.). (Fig- 30, PL II.) 



In a few of the numerous specimens of Cladophlebis the pinnules are more crowded 

 on the pinnae than is usual in C. denticulata, and differ in their straighter form and in 

 the repeated dichotomy of the secondary veins. One of these is shown in fig. 30, PL II. 

 This form agrees very closely with that described by Lindley and Hutton as Pecopteris 

 haiburnensis || from the Inferior Oolite of East Yorkshire. This species is recorded 

 also from Jurassic beds in Turkestan, IF and by Fontaine # * from Jurassic beds in Oregon. 



* Hartz (96). t Yokoyama (94). J Seward (07). § Ward (00), pi. lv. 



|| Lindley and Hdtton (36), pi. clxxxvii. 1 Seward (07), pi. vi. ** Ward (05). 



