102 CONIOPTERIS. 



edition it is transferred to S. hymenophylloides, and compared with 

 the recent species Davallia canariensis, Smith. 



In the Geological Survey of the Yorkshire Coast, by Young & 

 Bird, some small specimens of Sphenopteroid ferns are illustrated 

 by very inadequate and crude figures, some of which certainly 

 represent Brongniart's S. hymenophyttoides ; the original of fig. 5, 

 pi. ii. of the first edition of this work is undoubtedly a fragment 

 of the present species. 1 



Among the numerous examples of ferns in the Museums of 

 Whitby, Scarborough, Cambridge, York, and elsewhere, which 

 I regard as specifically identical with Coniopteris hymenophylloides, 

 there are several labelled by Bean and others Sphenopteris or 

 Pecopteris Murrayana. This brings us to the question of the 

 possible identity of the plant which Brongniart named Pecopteris 

 Murrayana and his species S. hymenophylloides. It is probable 

 that under the former designation the Trench author included more 

 than one species ; some of the specimens, e.g. that of fig. 3, 

 pi. cxxvi., 2 1 am of opinion should be referred to Coniopteris hymeno- 

 phylloides, but some of the others may be retained under the name 

 Sphenopteris Murrayana. Brongniart's fig. 3 of S. Murrayana 

 agrees closely with Fig. 2, PI. XXI. and with Fig. 6, PL XVI. of 

 this Catalogue. A Bornholm fern, Pecopteris Pingelii, is considered 

 identical with Sphenopteris Murrayana, and this species may 

 probably be added to the synonymy under C. hymenophylloides. 



There are some other species figured in the Histoire which 

 should perhaps be transferred to the latter species ; the fragments 

 named by Brongniart Sphenopteris crenulata may well be identical 

 with C. hymenophylloides, but on this point it is difficult to speak 

 with certainty (cf. PL XX. Fig. 1, and Brongniart's pi. Ivi. fig. 3). 

 Sphenopteris denticulata, Brongn., is another species which may 

 be compared with C. hymenophylloides, but so far as it is possible 

 to base an opinion on the figure, it would seem more probable 

 that it is identical with S. Williamsonis, Brongn. (cf. Brongniart's 

 figure 3 and PL XVII. Fig. 2). 



An examination of the type-specimen of Sphenopteris arguta of 

 Lindley & Hutton leads me to regard that species as identical with 



1 Young & Bird (22), loc. cit. 



2 Brongniart (28*). 



3 Brongniart (28 2 ), pi. Ivi. fig. 1. 



