RAVENHEAD COLLECTION IN THE BROWN FREE LIBRARY AND MUSEUM. 403 



There is no recent genus with which Sphyropteris can be compared in the arrange- 

 ment of its sporangia and the peculiarly developed sporangia! band. In the structure 

 of the individual sporangia, however, they are clearly shown to be Marattiaceous, and 

 in their apparently opening by a terminal pore, they show some similarity to the 

 sporangia of the recent Danwa. 



Sphyropteris Crepini, Stur, does not appear to differ in any character from 

 Sphyropteris obliqua, Marrat, sp. 



Zeilleria, Kidston. 

 Zeilleria delicatula, Sternb., sp. 



Zeilleria delicatula, Kidston, Quart. Jour. Geol. Soc, vol. xl. p. 592, pi. xxv. 



Zeilleria delicatula, Kidston, Catal. Palaioz. Plants, p. 66, 



Sphenopteris delicatula, Sternb., Vers., i. fasc. ii. p. 30, pi. xxvi. fig. 5 ; fasc. iv. p. xvi. 



Sphenopteris, Brongt. 

 Sphenopteris Sauveurii, Crepin. 



Sphenopteris Sauveurii, Crepin, Bull. Soc. Roy. Bot. de Belgique, vol. xix. part ii. p. 17. 



Sphenopteris Sauveurii, Crepin, ibid., vol. xx. part ii. p. 26. 



Sphenopteris Sauveurii, Zeiller, Flore foss. d. bassin houill. d. Valenciennes, p. 79, pi. ix. fig. 6.* 



Sphenopteris trifoliolata, Artis, sp. 



Sphenopteris trifoliolata, Brongt., Prodrome, p. 51. 

 Filicites trifoliolatus, Artis, Antedil. Phyt., pi. xi. 



Remarh. — For notes on Sphenopteris trifoliolata, see the following species. 



Sphenopteris Marratii, Kidston, n. sp., 

 PI. II. figs. 1, 2. 



Sphenopteris-Gymnogramrnides, Proc Liverpool Nat. Field Club for 1870-71, frontispiece, fig. 1, 1871. 

 Sphenopderis trifoliolata, Marrat (not Artis), Proc. Liverpool Geol. Soc, Session 13, 1871-72, p. 98, 1872. 



Description. — Frond bi- or tripinnate, pinnse linear lanceolate, alternate ; pinnules 

 small, of firm texture, opposite or alternate, obovate, obcordate, or trilobate ; the pinnules 

 towards the base of the pinnse stalked, the uppermost pinnules sessile or attached by a 

 wide pedicle-like contraction of the pinnule. Main rachis of primary (?) pinnae or 

 frond (?) moderately thick, the other rachis thin. Venation not shown. 



Remarks. — There is no more difficult class of fossils to determine accurately than 

 the small pinnuled Sphenopterids, and it is only after a good deal of consideration that I 

 have come to the conclusion that a new specific name must be applied to the two 

 specimens given on PL II. figs. 1, 2. 



Sphenopteris Marratii appears to me to be altogether different from Sphenopteris 



* A fall synonymy is given here by M. Zeiller of this much-confused and many -named species. 



