ONYCHIOPSIS. 55 
2.—Onychiopsis elongata (Geyler). 
1871. Sphenopteris Gopperti, Schenk (in part), Paleontographica, vol. xix. 
pl. xxx. figs. 2 and 2a (not the other figures). 
1877. Thyrsopteris elongata, Geyler, Paleontographica, vol. xxiv. p. 221. 
1883. Zhyrsopteris elongata, Schenk, Richthofen’s China, vol. iv. p. 263, 
ple. live Hig. 2. 
1886. Dicksonia elongata, Yokoyama, Bull. Geol. Soc. Japan, vol. i. No. 1, 
p. d. 
1889. Thyrsopteris rarinervis, Fontaine, Potomac Flora, p. 124, pl. xxvi. 
figs. 6 and 7; pl. xliii. figs. 4-6; pl. xliv. figs. 1, 2 and 5; 
pl. xlix. fig. 2; pl. clxix. figs. 6 and 7. 
1890. Onychiopsis elongata, Yokoyama, Journ. Coll. Sci. Japan, vol. iii. 
p- 27, pl. ii. figs. 1-3; pl. iii. fig. 6d; pl. xii. figs. 9 and 10. 
1890. Onychiopsis elongata, Nathorst, Denkschr. k. Ak. Wiss. math.-nat. Cl. 
vol. lvii. 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': — 
‘“‘Th. fronde bi-tripinnata, pinnis pinnulisque elongatis, pinnulis 
inferioribus imprimis longissimis; pinnulis sterilibus crenatis seu 
pinnatifidis in apicem sensim protractis, ]obis 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,’ bi-tripinnated; sterile pinne 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 Palwontographica, vol. xxiv. p. 224. 
2 Journ. Coll. Sci. Japan, vol. iii. p. 27, 
