325 
some respects, by its more ovate shape and its peculiarly 
serrated margin. 
Ulmus Tasmanicus, ns. Fig. 7. 
Leaf ovate-lanceolate ; base somewhat imperfect in the only 
specimen obtained, but evidently rounded ; mid-rib strong 
towards base, and rapidly diminishing towards acuminate 
apex, where it is extremely delicate though sharply raised ; 
secondary nerves simple or furcate (about 12 pairs) emerging 
from mid-rib at an angle of about 60 degrees, and proceeding 
upwards and outwards more or less irregularly straight or 
curved, terminating in a marginal tooth or serrature ; margin 
somewhat coarsely and irregularly serrate, one or two serratures 
between extremities of secondary nerves. Viewed from the 
exposed lower surface of leaf, the left side has the fourth and 
sixth, and the right side the fifth, seventh, and eighth 
secondary nerves, furcate: Tertiary nerves at right angles to 
the secondary rare and very delicate, losing themselves in an 
extremely fine reticulation. 
Length, about 5in.; greatest breadth, about 1fin.; distance 
between each of the lowest four secondary nerves at base 
about 12 milimetres, the spaces gradually lessening upwards. 
Tertiary Sandstone, Mount Bischoff. 
Although it is somewhat hazardous to determine the true 
position of a plant in the absence of fruit, I have referred 
the above leaf to the genus Ulmus, on account of the very 
characteristic form and neuration. I have frequently observed 
winged seed-impressions very like that of the Elm at One 
Tree Point. 
Figs. 2, 3, 9, 10, 11 represent leaf impressions found 
associated with those described from the Tertiary Sandstones, 
Mount Bischoff, but whose position is as yet undetermined. 
THE TASMANIAN EARTH TREMORS, 1883-4.5. 
By A. B. Biaes. 
(Read 9th June, 1885.) 
The minute earth-shocks which have, during the past two 
years, been adding a new chapter to the history of our 
island, have been to me from the first a special subject of 
observation and study. The principal points which I set 
myself, if possil le, to ascertain, were—First.—To arrive at an 
estimate of the actual magnitude of the surface-motion of 
the earth ; and second.—To gain some idea of the position of 
the source, or focus, of the disturbance. I soon found, how- 
ever, that the subject was much more difficult than I anti- 
C 
