658 
Proceedings of the Royal Society 
S.S.W. of , 
f 3rd August. 
53 fathoms. 
80 T 5 per cent. 
North Rona I 
[ 3rd „ 
59J „ 
31-54 „ 
W. of i 
\ 18th ,, 
43 ,, 
77-00 „ 
North Rona 1 
[ 18th „ 
54 „ 
22-61 „ 
(2) Dredgings . — Two hauls of the dredge were taken N.N.W. of 
North Rona on the 3rd and 4th August 1880. Lat. 59° 12' N., 
long. 5° 57' E., in 53 fathoms. 
1st haul. — The dredge was lowered at 5.30 p.m. and hauled in 
again at 8 p.m., it had two swabs and a tow-net attached. The hag 
of the dredge and the tow-net attached were filled with sand and 
gravel, and several echini, starfish, ophiurids, polyzoa, lamellibranchs, 
annelids, hydroids, and attached foraminifera. 
2nd haul. — The dredge, with swabs, was put over at 9.30 p.m. on 
the 3rd, and hauled in at 3.30 a.m. on the morning of the 4th 
August. The bag of the dredge was burst, or rather the lower 
surface had been torn away by passing over rough ground, one swab 
was carried away, and the other was covered with polyzoa. In the 
dredge and on the swab were several starfish, one comatula, 
ophiurids, Crustacea, gasteropods, and lamellibranchs, many polyzoa, 
cirtipeds, pycnogonids, sponges, hydroids, and attached foraminifera. 
The largest pieces of rock were about 4 centimetres in diameter, 
and all the fragments were more or less rounded. 
The following were the principal varieties of rocks observed : — 
1. Mica-schist, composed of alternate bands of feldspar and quartz 
with mica. 
2. Quartzite. 
3. Micaceous quartzite (Cambrian 1 ?). 
4. Red micaceous sandstone. 
5. Limestone. 
6. Syenitic rock containing feldspar and hornblende, quartz, pass- 
ing to amphibolite. 
7. Large grained sandstone (Cambrian?), containing feldspar. 
8. Arkose, containing quartz, feldspar, and Muscovite. 
The sand is composed of grains of quartz, more or less rounded, 
feldspar grains are much less abundant, hornblende, small fragments 
of rocks, quartzite, sandstone, amphibolite. The sand seems to 
come from the decomposition of granite and gneiss. It is strange, 
however, that mica appears to be quite absent. We subjoin a list 
of the animals obtained. 
