Marine Muds and Nodules 143 



Xo. 7 is the red clay from 90 fathoms in the Firth of Clyde, 

 off the north-east part of the Island of Arran, which has 

 already been referred to. It is a very fine red ochreous mud, 

 much resembling the oceanic clays. On washing, it is found 

 to be almost completely moulded into coprolitic pellets, and 

 supports an abundant ground fauna. Like oceanic clays, 

 on careful washing, grains of peroxide of manganese can be 

 isolated, and it contains over i per cent, of phosphoric acid. 



Xo. 8 is red clay from lat. 18 56' N., long. 59 35' W., 

 depth 2975 fathoms, in the western basin of the Xorth Atlantic. 

 9 is a coating of peroxide of manganese from an oceanic 

 concretion, but the locality has been omitted to be noted. 



No. 10 is mud from 115 fathoms in the channel between 

 the Island of Searba and the Garvelloch Islands, about twenty 

 miles S.W. of Oban. Peroxide of manganese is very abundant 

 as a coating on dead shells. 



No. II is from the upper basin of Loch Fyne, in 60 fathoms. 

 The mud here contains a remarkably large amount of sulphur. 

 The upper basin of a sea loch is, as regards many of its 

 conditions, and notably as regards the nature of the mud 

 at its bottom, in a state intermediate between that of the open 

 sea and that of vater lake. The mineral constituents 



are usually in a lower state of oxidation than outside; and 

 is accompanied by, and partly due to, the relatively 

 large amount of vegetable debris from the land. All these 

 circumstances may retard the disappearance of the sulphur. 

 12 and 13 are globigerina oozes from the Pacific 

 and the Atlantic respect ivelv, their particular locality not 

 noted. 



<>m the same locality as No. 10. 



No. 15 is from a position north-east of the Island of Rum, 

 in 147 fathoms, soft grey mud 



No. 16 is a blue mud, from 2050 fathoms in the Celebes 

 Sea. 



No. 17 is a glauconitic mud from the east coast of Aust 

 in 410 i lat. 34 13' S., long. 151 38' E. 



No. 1 8 is a diatomaceous mud from the Antarctic O 

 53 55' S., long. 148 35' E. 



