13870. | _BILLINGS—LOWER-SILURIAN TRILOBITES. 479 
pany with Prof. Hind, in the winter of 1868, at which time the 
mining on the lodes referred to in the map before the Society was 
at a standstill, the lodes having been lost by reason of a fault. He 
thought it was very satisfactory to find that the theoretical position 
which Prof. Hind, from his explorations, assigned to the lodes had 
been completely verified. Mr. Robinson also stated that gold is 
being mined in the synclinals by sinking shafts and driving cross 
cuts. 
Mr. Hryp remarked that all the Lower Silurian in Nova Scotia 
was auriferous, and that the gold was derived from the underlying 
Laurentian rocks. He stated that Sir W. E. Logan had indicated 
an auriferous zone in the Laurentian of Canada. Gold was finely 
distributed in the slates of Nova Scotia, as in Victoria, in the neigh- 
bourhood of lodes, according to Mr. R. Brough Smyth, 
May 11, 1870. 
Sir William Bagge, Bart., M.P., of Stradsett Hall, Market Down- 
ham, Norfolk ; Colonel James Leslie Tait, of Montgomery, Alabama, 
U.S., and Dr. C. C. Caruana, of the Malta University, were elected 
Fellows of the Society. 
The following communications were read :— 
1. Norzs on some specimens of Lownr Stturtan Tritoprres. By E. 
Britrnes, Esq., F.G.8., Paleeontologist of the Geological Survey 
of Canada, 
(Puates XXXT. anp XXXII.) 
1. Asaphus platycephalus, with some of the legs preserved. 
TuIs specimen was collected in the Trenton Limestone, at the city 
of Ottawa, about ten years ago. When discovered it was lying flat 
upon a thin slab of limestone, and well preserved, with the ex- 
ception of the eyes, which seem to haye been forced inwards by 
pressure from above. It was also divided into two pieces by a 
fissure which extended diagonally across, from the first segment 
of the thorax on the left side to the fifth segment on the right. 
It remained in the Museum for several years without attracting 
particular attention, until one day, observing that the part in front — 
of the fissure was somewhat loosely attached, I removed it, and was 
surprised at finding, on the underside, not only the hypostoma in 
place, but also what appeared to be some of the legs of the animal. 
As the part behind the fissure was more firmly attached to the 
stone, I had it cut across just behind the eighth segment by the 
lapidary of the Survey. The remainder of the thorax was then 
easily split off. The pygidium came off with difficulty and in two 
pieces. All the pieces were then fastened together; and we thus 
obtained two specimens, one of which shows the underside of the 
Trilobite, and the other its impression on the stone, 
On the underside (Pl. XX XI. fig.1) a broad shallow groove extends 
