142 MR ROBERT KIDSTON ON THE FRUCTIFICATION OF 



The sporangia of C. bifida are more numerous, narrower, and slightly larger 

 than those of C. affinis, L. & H., sp., to which I in error referred the first 

 specimens of the fruit of C. bifida* 



Sph.frigida, Heer, and Sph. geniculata, Heer, seem to have been founded on 

 imperfectly preserved fragments of C. bifida, L. & H., sp. 



To C. bifida must also I think be referred S. rutwfolia, Schmalhausen 

 (not Gutbeir) and S. tracyana, Lesquereux. Any one having only the 

 original figure of Ltndley and Hutton to guide them in their identification 

 of this species, may be very well excused for regarding Todea Lipoldi, Sph. 

 rutwfolia, Schmalhausen, and S. tracyana, as specifically distinct from C. 

 bifida; but from the examination of numerous specimens, many of which 

 came from the original locality, I have no doubt that all the names 

 included in the list of synonymy here given under C. bifida refer to this one 

 species. 



Description of Specimens. — Fig. 1. This specimen was collected by Mr 

 John Jackson on the River Irthing, within a mile above Lampert, and 

 communicated to me by Mr Hugh Miller, F.G.S. The specimen is 

 badly preserved, and reduced very much to the same condition as that 

 of the original type figured by Lindley and Hutton in their Fossil Flora, 

 pi. liii., where the limb of the pinnules has entirely disappeared, leaving only 

 the veins. Notwithstanding, however, the imperfect state of the example 

 shown at fig. 1, it is interesting, as distinctly showing the position occupied 

 by the fructification of this species, which is on the rachis below the dichotomy 

 as well as on the base of the two arms of the fork. 



Specimen from Lewis Burn, rather over 200 yards below Lewis Burn Colliery, 

 N. Tynedale, Northumberland (fig. 2), in the Collection of the Geological 

 Survey of England, collected by Mr J. Rhodes. This example, which occurs 

 in association with barren fragments of C. bifida, exhibits the characteristic 

 dichotomisation of the fructifying branches of this species, and in fact of the 

 genus Calymmatotheca. The rachis of the pinnae here seems to undergo three 

 series of dichotomies, at the extremities of the ultimate forks of which the 

 synangia were borne, f 



Specimen from Back Burn, ojDposite Cranecleuch New Houses, N. Tynedale, 

 Northumberland, collected by Mr J. Rhodes, in the Collection of the Geological 

 Survey of England (fig. 3). The specimen figured lies on the corner of a 

 small slab which contains a great many groups of the sporangia of this 

 species. These groups seem to be much crushed and flattened out, 

 and little of the intimate structure is discernible. Only slight traces of 

 the stem which bore the synangia is preserved in this example. The 



r 



Trans. Roy. Sor. Edin., vol. xxx. p. 539, pi. xxxi. fig. 6 



t See Trans. Roy. Soc. Edin., vol. xxx. pi. xxxi. fig. 6. 



