ONYCHIOPSIS. 55 



2. Onychiopsis elongata (Geyler). 



1871. Sphenopteris Gopperti, Schenk (in part), Palaeontographica, vol. xix. 



pi. xxx. figs. 2 and 2<z (not the other figures). 



1877. Thyrsopleris elongata, Geyler, Palseontographica, vol. xxiv. p. 221. 

 1883. Thyrsopteris elongata, Schenk, Richthofen's China, vol. iv. p. 263, 



pi. liv. fig. 1. 

 1886. Dicksonia elongata, Yokoyama, Bull. Geol. Soc. Japan, vol. i. No. 1, 



p. 5. 



1889. Thyrsopteris rarittervis, Fontaine, Potomac Flora, p. 124, pi. xxvi. 



figs. 6 and 7 ; pi. xliii. figs. 4-6 ; pi. xliv. figs. 1, 2 and 5 ; 

 pi. xlix. fig. 2 ; pi. clxix. figs. 6 and 7. 



1890. Onychiopsis elongata, Yokoyama, Journ. Coll. Sci. Japan, vol. iii. 



p. 27, pi. ii. figs. 1-3 ; pi. iii. fig. 6^; pi. xii. figs. 9 and 10. 

 1890. Onychiopsis elongata, Nathorst, Denkschr. k. Ak. Wiss. math.-nat. Cl. 

 vol. Ivii. p. 55. 



Type. Sterile and fertile portions of frond. 



The species, instituted by Geyler from specimens found in the 

 Province of Kaga, Japan, is thus defined l : 



" Th. fronde bi-tripinnata, pinnis pinnulisque elongatis, pinnulis 

 inferioribus imprimis longissimis ; pinnulis sterilibus crenatis sen 

 pinnatindis in apicem sensim protractis, lobis obtusiusculis, pinnulis 

 fertilibus eodem modo valde elongatis, involucris breviter stipitatis, 

 ovalibus seu ? rotundatis." 



The few fragments in the Museum collections referred to this 

 species add nothing to the definitions given by Geyler and 

 Yokoyama; the latter had the more perfect material at his 

 disposal, and his diagnosis may therefore be reproduced verbatim. 



" Frond slender, 2 bi-tripinnated ; sterile pinnse alternate or 

 rarely opposite, elongated, their length rapidly increasing towards 

 the lower part of the frond ; pinnules alternate, acutely directed 

 forward, lanceolate or linearly-lanceolate, entire or lobed, or even 

 pinnately parted; lobes or partitions acute at apex and acutely 

 directed forward just like the pinnules themselves. Venation 

 obsolete, secondary veins simple, each going into a lobe. Fertile 

 pinnules elongated, with a linear terminal sorus on both sides of 

 the midrib." 



Geyler compares his species with some previously described and 

 figured by Heer under the generic name Thyrsopteris, from East 



1 Palaeontographica, vol. xxiv. p. 224. 



2 Journ. Coll. Sci. Japan, vol. iii. p. 27. 



