OF COAL-MEASURE PLANT-IMPRESSIONS, 215 
Doubtful records which I have not seen are :— 
Transition Coal Measures. 
? South Lancashire: Bradford Colliery, Manchester [Gerrard (10. 
p. 561) & Kidston (17. p. 321)]. 
Middle Coal Measures. 
? Leicestershire Coalfields :—Bretby, S. Derby (Horwood, 13. p. 154). 
4, CONCLUSIONS. 
From the specimens figured here I think it will be clear that Neuropteris 
callosa, Lesq., is quite distinct from N. obliqua, Brongn. The pinnules of 
the former could only be mistaken for the minor pinnules of the latter. In 
both cases the nerves are slightly flexuous, but the insertion of the pinnules, 
the origin of the basal nerves, and the spacing of the veins in the latter 
species will alone serve to distinguish this type from N. callosa. On the 
other hand, N. callosa lies much nearer to other species of the same genus, 
especially N. tenuifolia (Schl.), and, in a more remote degree, N. heterophylla, 
Brongn. © In N. tenuifolia, however, the pinnules are usually much larger, 
the veins are not flexuous, the median nerve is much stronger near the base 
of the pinnule, and the lateral nerves are often more distinctly arched and 
highly divided. Neuropteris callosa is distinguished from N. heterophylla by 
the fact that the pinnules do not become decompound as in that species. The 
nervation in N. heterophylla is also much coarser and more crowded, and the 
veins are not flexuous, but more frequently dichotomised. 
At the same time it must be admitted that difficulties in discriminating 
between all these species may arise when dealing with fragmentary or not 
exceptionally clear materials, or with certain portions of pinnæ. I am, for 
instance, still rather in doubt as to which species the specimens figured by 
Zeiller in his Valenciennes Flora (page 48) under the name N. obliqua 
belong to, though I am inclined to think they are there correctly named and 
are distinct from N. callosa, Lesq. 
EXPLANATION OF THE PLATES. 
All the figures are from photographs by Mr. W. Tams, of Cambridge, from specimens 
in the Sedgwick Museum, Cambridge. The numbers refer to the Carboniferous Plant 
Collections in that Museum. 
PLATE 14. 
NEUROPTERIS OBLIQUA, Brongn. (Figs. 1-8.) 
Fig. 1. Coal Measures, locality unknown, No. 1430 (nat. size). 
Fig. 2. » " Ingleton Colliery, No. 2180 (nat. size). 
Fig. 3. , » Barnsley, No. 1362 (nat. size). 
Figs.4& 5. „ » locality unknown, No. 1708. Fig. 4 (nat. size). 5 (x3). 
