27 
The Jurassic plants of Siberia, described by Heer(l) as Phyllotheca sibirica Heer, 
are in my opinion members of the genus Equisetites, approaching somewhat closely 
the New Zealand fossils here under discussion. In both cases the free portions of 
the leaves are very elongate and acuminate, though the leaves as a whole do not 
appear to be precisely similar in form, and therefore the two plants are probably 
specifically distinct. 
Type.- —Sedgwick Museum, Cambridge. 
Occurrence.- —Mokoia, Gore, Southland (? Lower Jurassic). 
Genus PHYLLOTHECA Brongniart, 1828. 
{Prodr. Hist. Veget. Foss., pp. 151, 175.) 
Phyllotheca minuta sp. liov. Plate II, figs. 5, 9. 
Diagnosis.- —Detached whorls of leaves, cup-like in form. Leaves fleshy below, 
only united at the base, about 10 in a whorl, bases broad, leaves exceeding 5 mm. 
in length, lanceolate, tapering towards the apex, uninerved. 
Descriptions of the Specimens.- —In the New Zealand Survey collection from the 
Clent Hills a few detached leaf-sheaths occur, two of which are seen in Plate II, 
figs. 5 and 9, both natural size. That shown by fig. 9 was originally figured, but 
not described, by Hector(2). Th^ sheath is here seen from below. The free portions 
of the leaves are shortly lanceolate, and about 3 mm. in length. There appear to be 
° from seven to eight thick fleshy leaves in the whorl. A similar sheath, in which the 
leaves are less perfect, is shown on fig. 5 of the same plate. 
Remarks. —There is little doubt, I think, that these specimens represent the foliage 
of a Phyllotheca, which, in the size of the sheaths and other characters, is unlike any 
species of that genus known to me. I therefore regard it as a new type, which I 
term P. minuta sp. nov. It occurs in the collections both from Mount Potts and the 
Clent Hills. In the former locality a variety of leafless stems, probably pith-casts of 
more than one type, have been found, and these also probably belong to the same genus. 
Types in the New Zealand Geological Survey collection. 
Occurrence.- —Mount Potts (Rhsetic) ; Clent Hills (Rhsetic). 
FERN- LIKE PLANTS.. 
Genus CHIROPTERIS Broun, 1858(3). 
{Jahrb. fur Mineral., Jahr. 1858, p. 143.) 
Chiropteris lacerata Arber. Plate III, fig. 8. 
1913. Chiropteris lacerata Arber, Proc. Roy. Soc. London, Ser. B, vol. lxxxvi, p. 346, pi. 8, 
fig. 6. 
Diagnosis. —Leaf cuneate, exceeding 5 cm. in length and 3 cm. in breadth ; apex 
deeply toothed, teeth fairly broad; veins fine, close, frequently anastomosing. 
Description of the Specimen. —This plant appears to be rare at Mount Potts. 
The type specimen, which is itself imperfect, is seen enlarged on Plate III, fig. 8. 
It is nearly 6 cm. long. It is not quite certain that the termination of this leaf 
is the true apex, neither is it’ beyond doubt that the apparent teeth were a natural 
feature—they may be due to the imperfect preservation of the apical region ; but, 
so far as one can judge from a single specimen, I think it more likely that the 
apex of the leaf was in nature deeply incised. 
(1) Heer (1876 2 ), p. 43, pi. iv, figs. 1-7 ; see (2) Hector (1886 1 ), P- 65, fig. 30 (4) pars, 
also (1878), p. 4, pi. i, figs. 9-15; (3) Kurr, MS. name. 
(1880), p. 9, pi. i, figs. 5, 6. 
