TNIOPTERIS. 125 
Tf we look over a number of specimens of the recent genus 
Oleandra, e.g. O. neriiformis, Cav., we find that such characters 
as the horizontal or inclined position of the lateral veins and 
the degree of closeness with which these veins are arranged, 
are by no means constant in the same species, or even in the 
same leaf. 
In all such examples of the recent genus as I have seen the 
apex of the leaf is acuminate, but occasionally in young leaves 
there appears to be a similar termination to that in Z. Beyrichit, 
Schenk. In some forms of Oleandra the leaf apex becomes 
suddenly and sharply acuminate; if the tip of such a leaf were 
broken off or bent back we should have an appearance very similar 
to that represented in Pl. IX. Fig. 3 of the present Catalogue. 
The following classification of the Wealden fragments must be 
regarded as provisional, and not one which rests on a very sure 
foundation. 
1.—Teeniopteris Beyrichii (Schenk). 
1871. Oleandridium Beyrichii, Schenk, Paleontographica, vol. xix. p. 221, 
pl. xxix. figs. 6 and 7. 
1874. Oleandridium Beyrichii, Schimper, Trait. pal. vég. vol. iii. p. 514. 
1882. Oleandridium (Teniopteris) Beyrichii, Peyton, Quart. Journ. Geol. 
Soc. vol. xxxix. 1883, Proc. p. 3. 
Type. Well-preserved leaf. In the Berlin Collection. 
Schenk gives the following definition of the species !:— 
‘Folia simplicia oblonga integra obtusa leviter emarginata basi 
attenuata, 5-8 millim. lata, 6} centim. longa, nervi primarii 
excurrentes, secundarii creberrimi tenuissimi angulo  subrecto 
egredientes dichotomi vel simplices.” 
Frond simple, linear, entire, apex obtuse and slightly depressed, 
gradually decreasing in breadth towards the basal end; breadth 
about 5 mm. and length about 10 cm. Distinct midrib with 
numerous lateral veins almost at right angles, or somewhat oblique, 
and suddenly curved inwards towards the frond axis on the upper 
surface, simple or forked. 
1! Paleontographica, vol. xix. p. 221. 
