Geological Society of London. 137 
sloping face of the cliff, coupled with a microscopic examination of 
the rocks, they have arrived at the conclusion that the serpentine is 
part and parcel of the foliated series to which the hornblende-schists 
belong, and that the apparent evidences of intrusion of serpentine 
into schist in that district are consequences of the folding and fault- 
ing to which the rocks have been subjected since the banding was 
produced. The interlamination of serpentine and schist is described. 
and also the effects of folding and faulting. Basic dykes, cutting 
both serpentine and schists, are clearly represented in the portion 
of the coast which has been mapped, and these locally pass into 
hornblende-schists, which can, however, be clearly distinguished from 
the schists of the country. The origin of the foliation in the dykes 
is discussed. 
The second part of the paper deals with a small portion of the 
coast east of the Lion Rock, Kynance. Here a small portion of the 
“oranulitic series” is seen in juxtaposition with serpentine. The 
phenomena appear to indicate that the granulitic complex was 
intruded into the serpentine; but they may possibly be due to the 
fact that the two sets of rocks have been folded together while the 
granulitic complex was in a plastic condition, or to the intrusion of 
the serpentine into the complex while the latter was plastic. 
2. “On a Radiolarian Chert from Mullion Island.” By Howard 
Fox, Hsq., F.G.S., and J. J. H. Teall, Esq., M.A., F.R.S., F.G.S. 
The main mass of Mullion Island is composed of a fine-grained 
*‘oreenstone,” which shows a peculiar globular or ellipsoidal 
structure, due to the presence of numerous curvilinear joints. Flat 
surfaces of this rock, such as are exposed in many places at the base 
of the cliff, remind one somewhat of the appearance of a lava of the 
* pahoehoe ” type. 
The stratified rocks, which form only a very small portion of the 
island, consist of cherts, shales, and limestone. They occur as thin 
strips or sheets, and sometimes as detached lenticles within the 
igneous mass. The chert occurs in bands varying from a quarter of 
an inch to several inches in thickness, and is of radiolarian origin. 
The radiolaria are often clearly recognizable on the weathered 
surfaces of some of the beds, and the reticulated nature of the test 
may be observed by simply placing a portion of the weathered 
surface under the microscope. 
The authors describe the relations between the sedimentary and 
igneous rocks, and suggest that the peculiar phenomena may be due 
either to the injection of igneous material between the layers of the 
stratified series near the surface of the sea-bed while deposition was 
going on, or possibly to the flow of a submarine lava. 
The forms of the radiolaria observed in the deposit, and also their 
mode of preservation, are described in an Appendix by Dr. G. J. Hinde. 
3. “Note on a Radiolarian Rock from Fanny Bay, Port Darwin, 
Australia.” By G. J. Hinde, Ph.D., V.P.G.S. 
A specimen brought from Fanny Bay by Captain Moore, of 
H.M.S. “ Penguin,” is of a dull white or yellowish tint, in places 
stained red. It has an earthy aspect, and is somewhat harder than 
