of Edinburgh, Session 1881 - 82 . 
673 
The following are the principal varieties of rocks dredged : — 
1. A fine-grained reddish sandstone (Cambrian V) compact, with 
lamellae of mica. This fragment is about 12x8x4 inches, and had 
polyzoa, serpulse, and rhizopods attached to it. The angles are more 
or less rounded. On the upper surface there are parallel striae, which 
may be glacial markings. The whole upper surface and edges are 
blackened by manganese deposit. This fragment was only very 
partially imbedded in the mud. 
2. A rounded fragment of diorite, fine-grained, containing plagio- 
clase, orthoclase, hornblende, and quartz. This fragment was also 
blackened by manganese except the under surface, where it evidently 
rested on the mud, and is about 4 inches in length. 
3. A micaceous sandstone, fine-grained ; the mica appears to be 
biotite. This fragment is about 5 inches long and is angular. 
4. Mica-schist with biotite, 
5. Altered mica-schist. 
6. Gneissic rock, with quartz, orthoclase, and mica. 
7. Diorite — containing plagioclases, amphibole, and quartz. 
8. A fine-grained limestone. 
9. Compact crystalline rock, containing hornblende, quartz, and 
feldspar passing to diorite. 
10. Amphibolic rock. 
11. Chloritic rock. 
The majority of these fragments were covered on one of their 
surfaces with a black deposit of manganese, and nearly all of them 
when lying on the bottom most probably projected above the deposit 
in which they were placed. Some of them were perfectly rolled frag- 
ments with smooth surfaces, while others were angular. 
List of the animals taken in the dredge. 
Mollusea. 
Fusus islandicus (young). 
Chemnitz. 
, , lachesis. 
Morch 
Pleurotoma declivis. 
Loven. 
Ophiuroidea. 
Ophiactis abyssicola. 
Ljn. 
Ophioscolex glcicictlis. 
Mull. & Tr 
Asteroidea. 
Crossaster papposus (Linck), var. scp- 
n. sp. 
tentrionalis. 
