106 CONIOPTEEIS. 



reference may be made to a figure of Asplmium muUilmeatum, Hk., 

 given by Eeinecke in a recent volume of Engler's Jahrbiicher} 



An Englisb specimen in tke Lund Geological Museum, labelled 

 by Ifathorst Sphenopteris searhroensis, bears a very close resemblance- 

 to Coniopteris hymenophylloides, and may be identical "witb tbat 

 species. C. hymenophylloides is represented by numerous specimens- 

 in aU collections of Torksbire Jurassic plants. 



52,568. PI. XVI. Figs. 4 and 5. 



Several pieces of pirmsB witb deeply dissected pinnules, varying- 

 in size from tbe small and narrow form shown in Fig. 4 to the- 

 broader deltoid sbape of Fig. 5. Tbe venation is very clearly 

 sbown in some of tbe pinnules. These fragments appear to me- 

 identical witb Brongniart's Sphenopteris hymenophylloides, tbe only 

 difference being that in tbe fragment of the lower part of the pinna 

 of Fig. 5 the segments are rather broader than in Brongniart's- 

 specimen. The pinna, of which a part only is drawn in Fig. 5,. 

 is 8 cm. in length, the uppermost pinnules being of the form 

 illustrated in Fig. 4. The type-specimen of Sphenopteris arguta, 

 L. & H., agrees exactly with the examples represented in 

 Figs. 4 and 5 ; similarly, I regard the smaller pinnae of the frond 

 shown in Fig. 1, PL XX. as identical with tbe present specimen.. 

 This leads to a comparison with Heer's species Thyrsopteris 

 Maakiana, from the Jurassic beds of Siberia,'* a type which 

 I believe to be identical with such English specimens as 52,568 

 (PL XVI. Figs. 4 and 5), tbe Whitby frond sbown in PL XX. 

 Fig. 1, 40,467 (PL XVII. Fig. 3), and others. 



Scarborough. Bowerlanh ColL 



V. 3672. PL XVI. Fig. 6. 



Tbe chief difference between this pinna and those of specimen 

 52,568 (PL XVI. Figs. 4 and 5) is in tbe more rounded form of 

 tbe lobes of the segments, as sbown in Fig. 6, PL XVI. This type- 

 of pinna is identical with those in some of tbe specimens referred 

 by Brongniart to Coniopteris Murrayana, especially as drawn in 

 bis pi. cxxvi. fig. 3.' Tbe example figured in PbilHps' third. 



' Eeinecke (97), pi. iv. 



' Heer (77), ii. pi. ii. fig. 6. 



s Brongniart (28^). 



