192 
PROFESSOR T. J. JEHU AND DR ROBERT CAMPBELL ON 
abdominal segments ending in a styliform telson. It appears to differ from its 
Palaeozoic congeners as yet described in baying some of the tergites of the abdominal 
segments produced into pleurae or lappets. From the resemblance of the valves in 
shape to the lamellibranch shell Modiola it is proposed to institute a new genus 
Modiolocaris, and to name the species Modiolocaris dakynsi after the late J. R. 
Dakyns, who was the first to map the Aberfoyle district for the Geological Survey. 
A common habit of these organisms in dying has been to throw out the body from 
beneath the protective carapace.” 
Y. INCERTiE SEDIS. 
Amongst the fossils found there are many which are either so fragmentary or so 
obscurely preserved that we cannot be certain of their true systematic position. 
Some of these have been photographed, and are shown in Plate II, figs. 4-9. They 
include (l) the jaw of an Annelid or one of the chelicerse of some Arthropod ; (2) the 
cercopods of a Phyllocarid Crustacean ; (3) fragments of some Arthropods — possibly 
of Trilobites or of Phyllocarids ; (4) pieces of the punctate skin of some Arthropod ; 
(5) a curious pitted triangular plate. 
II. The Upper or Margie Series. 
The Aberfoyle Limestone is regarded as a member of the Upper Series, and it 
probably corresponds with the Kilmahog Limestone, Callander, and the Margie 
Limestone of Forfarshire. It is exposed in an old limestone quarry about a mile 
north-east of the village of Aberfoyle, just at the limit of our district. This lime- 
stone is now involved in the crushed rocks along the Highland Boundary Fault, and 
at places is much brecciated. Though crystalline in texture, a close examination 
has proved this rock to be fossiliferous. Remains of Crinoids have been detected, 
and one of them is shown on Plate II, fig. 10. The determination of these remains 
as plates of Crinoids has been confirmed by Dr Bather of the British Museum. 
When examined in thin sections under the microscope the limestone is seen to. con- 
tain also the remains of other organisms. Specimens of the limestone, together 
with sections for microscopic examination, were sent to Dr G. Jennings Hinde. He 
has kindly supplied the following report : — jyp.; 
“NOTES ON FRAGMENTS OF LIMESTONE FROM A QUARRY NEAR ABERFOYLE 
IN THE HIGHLAND BORDER. By Dr G. J. Hinde. 
“Dr Jehu has forwarded to me some small fragments of limestone rock and a 
series of thin sections, five in number, taken from them, and asked for notes as 
to their microscopic characters. There is not much to be said about the general 
characters of the limestone as shown in these small fragments ; it is a compact, 
bluish-grey rock, crystalline, with occasional veins of calcite. The sections prove 
