328 Reports and Proceedings— 
in Skelgill, with Atrypa flexuosa, n.sp., and as Graptolitic shale at 
Browgill with Diplograpius acuminatus, Nich. 'The others appear 
to run persistently across the district, with the exception of the 
zone of Rastrites maximus, which has only been discovered in the 
Sedbergh area. The thicknesses, lithological characters, and fossil 
contents of these zones were considered, and comparisons made 
between these beds and the corresponding deposits of other areas. 
The whole group attains a thickness of from 250 to 400 feet, of 
which the Skelgill beds usually make up about one quarter. 
The authors correlate the Graptolite-zones with those of the 
Birkhill and Bala groups of Professor Lapworth as follows :— 
Laxe Disrricr. SoutH oF ScoTLanD. 
Zone of Monograptus crispus ...... = Zone of UW. exiguus. 
pp >, lurriculatus ......0.. Not separated. 
9, LRastrites MAXIMUS......4.. = Zone of R. maximus. 
», Monograptus spinigerus \ ial > Monograptus spinigerus. 
Monograptus Clingani band ...... 
Not represented? ..........ceeceees »,  Letalograptus cometa. 
Zone of Monograptus convolutus.. 
5 ) argenteus,. } = » WL. gregarius. 
6 Jimbriatus. 
35 Dimon “phogr aptus confer tus = »  Diplograptus vesiculosus. 
Diplograptus acuminatus... = D. acuminatus. 
” grap ” 
The zones of M. convolutus, M. argenteus, and M. fimbriatus contain 
abundance of M. gregarius, and the zone of Dimorphograptus confertus 
also contains Diplograptus vesiculosus in considerable numbers. 
The beds were also compared with the corresponding beds in 
Sweden, Bohemia, Bavaria, etc., and the fossils other than Grapto- 
lites were shown to occur elsewhere in strata of Llandovery- 
Tarannon age, from which it was concluded that the Stockdale 
Shales occupy that horizon. 
A fault occurs everywhere between the Middle and Lower Skelgill 
Beds, except perhaps in the Sedbergh district ; but it does not seem 
to cut out a great thickness of rock, and the authors gave reasons 
for supposing that it was produced by one set of beds sliding over 
the other along a plane of stratification. 
The beds are found to thicken out in an easterly direction, and the 
possibility of the existence of land in that direction was suggested. 
The authors directed attention to the importance of the Graptoli- 
toidea as a means of advancing the comparative Some of the stratified 
deposits of Lower Paleozoic age. 
A description was given of the following new species and 
varieties :— Phacops elegans, Boeck & Sars, var. glaber, Cheirurus 
bimucronatus, Murch., var. acanthodes, Cheirurus moroides, Acidaspis 
erinaceus, Harpes judex, H. angustus, Ampyx aloniensis, Proétus 
brachypygus, and Atrypa flexuosa. 
2. “On the Eruptive Rocks in the Neighbourhood of Sarn, Caer- 
narvonshire.” By Alfred Harker, M.A., F.G.S. 
The rocks in question occupy an area about 53 miles long from 
north to south and 21 miles broad near the south-western extremity 
of Caernarvonshire. They were described by the author under the 
following heads :— 
(i.) Granite occupying the northern and north-western part of 
