169 
strong, straight, rapidly narrowed towards the apex. The camptodromc 
secondary nerves are comparatively thin, undulate, unequal in their length, 
simple or branched near the margin, and anastomosing. They diverge 
from the primary nerve at rather acute angles. The tertiary nerves are 
flexuous, ramous, and anastomosing, and diverge from the outer side of the 
secondary ones at acute angles. The network, represented in Pig. 11a, 
enlarged, shows meshes which arc partly rhomboidal, partly irregularly edged. 
In regard to shape and nervation the above-described fossil leaf might, 
perhaps, be compared to species of Terminalici or Comb return, but neither of 
these genera exhibits such a strikingly thick consistence of leaf. Although 
this fossil may best be ranged into the Combretacem, no other living genus of 
that family can be found lit for its reception. It therefore seems to me that 
most of the arguments arc in favour of classing our fossil in an extinct 
genus. 
Locality and Horizon . — Between Hill and Watson’s shafts, in white 
pipeclay, from the Old Rose Valley Lead, Vegetable Creek Main Deep Lead, 
Emmaville (Vegetable Creek Township). 
MYRTACELE. 
Eucalyptus Mitciiellii, sp. nov. 
Plate XV, Figs. 6-8, 7a and b. 
Sp. Char. — E. foliis coriaceis, petiolatis, lanceloatis vcl lineari-lanceo- 
latis, subfalcatis, basi attenuatis, apice acuminatis, integerrimis ; nervatione 
rochidodroma ; nervo primario prominente ; nervis secundariis subangulis 
50-60° orientibus, approximates tenuibus, subflexuosis, arcubus laqueorum in 
nervum marginalem confluentibus inter se conjunctis ; nervis tertiariis e 
secundariis extus sub angulis acutis egredientibus ; reticulo microsynammato. 
Obs . — The fossil leaves represented in Pigs. 6, 7, and 8, doubtless 
belong to one and the same species. They are equal in texture, shape, and 
nervation, and only show fragments of different parts of leaf. The specimen, 
Pig. 7, exhibits the petiole and the rather narrowed base of leaf, and the 
specimen, Pig. 6, shows the lamina of the leaf to be lanceolate and falciform. 
The texture is coriaceous as the above-mentioned specimens, and that of Pig. 
8 indicate. Borders are untoothed. The nervation represented in Pig. 7a 
(enlarged) , is well preserved on all specimens, and exactly shows the type of 
11a G7— S8 2 A 
