KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 45. N;0 7. 9 



The venation is reticulate with open meslies. Also this character varies consider- 

 ably, but even in the specimen tig. 19, the meshes are comparatively broader than 

 in typical S. Nilssoniana. Midrib distinct or not developed. 



Sagenopteris Mantelli is characteristic of the Wealden. The age of the beds at 

 Kurremölla, in whieh the specimens ha ve been found, is not yet satisfactorily settled, 

 but, according to the prevailing opinion, they Avould, at all events, not be older than 

 middle Lias, but possibly younger. Nilssonia fallax Nath. from the same locality 

 is, according to Prof. Nathorst (7, p. 27), allied to N. schaumburgensis Dunk. sp. 

 of the Wealden, 



Sagenopteris sp. 



(Pl. 1, figs. 22, 23.) 



I have figured in pl. 1, figs. 22 and 23, a specimen of a Sagenopteris, which 

 does not seem to belong to any of the species mentioned above. Only this one 

 specimen has been found, and it is to o fragmentary to justify a specific determination. 



Only the larger part of one pinna and fragments of the others are preserved. 

 Their shape is not seen from the specimen, but they are apparently attached to the 

 top of a common petiole. The characteristic feature is the somewhat unusual aspect 

 of the venation. There is no midrib, but near the base the median portion of the 

 pinna is traversed by some parallel veins with few anastomoses. In general the 

 veins run more parallel to each other and to the axis of the pinna than in the other 

 species here mentioned, and are only slightly arched towards the margin. The meshes 

 are long and narrow. 



The specimen was found in the grey clay of Bjuf (oldest Rhsetic). 



The striking similarity in outer appearance, which exists undoubtedly between 

 Sagenopteris and the recent genus Marsilia, has induced many authors to place the 

 former genus — merely on vegetative characters — among the Hydropteridece. This 

 opinion seems to have been expressed for the first time by C. F. W. Braun (1; p. 

 14. 2; p. 84). To the same group he referred, however, also his new genus Baiera. 

 Several seed-like, pedicellate bodies, found in association with the Baiera, he regarded 

 as sporocarps of that plant (1; pl. 1, figs. 6 — 9). The specimen fig. 9 is evidently 

 different from the others and the only one, which could be suspected for being really 

 a sporocarp of a water-fern. The figure is however not conclusive in this respect, 

 and Schenk (1, p. 40), who has examined similar specimens, does not accept Braun's 

 view. Objects of exactly the same habit have låter been figured by Saporta (1, 

 pt. 3; pl. 156, 157) and Schenk (3, p. 261) and regarded as seeds of Baiera. As 

 regards the figures 6—8 in Braun' s paper, Schenk has found that the type-specimens 

 are of foliar nature and probably represent young leaves of Baiera. There is in 



K. Sv. Vet Akad. Handl. Band 45. N:o 7. 2 



