444 MB. w. E. HOYLE ON THE DEEP-WATER 
4. The Dunoon Basin occupies the channel of the river from 
the extremity of Great Cumbrae northwards, and extends up 
into the lower stretch of Loch Long. Its greatest depression off 
Dunoon is 56 fathoms. 
5. Loch Goil is only about 4 square miles in area, and its ex- 
treme depth is 47 fathoms. 
6. Upper Loch Long is of about the same extent, but has a 
depth of only 35 fathoms. 
7. The Garelocli has an area of about 5 square miles, and is 
23 fathoms in depth. 
The object which I set before myself was to ascertain as fully 
as possible the fauna of each of these depressions, limiting them 
by the contour-line of 20 fathoms, and then with all the mate- 
rials available to draw up comparative lists, and to endeavour to 
discover their relations to each other. 
Unfortunately I have been unable to make much use of the 
published works of my predecessors, owing to the form in which 
their results are stated. “ Pairly common in depths of 5-25 
fathoms,” with a few localities appended, is the type of a phrase 
which occurs continually, hut is, for the purposes of the present 
inquiry, quite useless. The cases in which I have drawn infor- 
mation from sources other than the records of the Scottish 
Marine Station are all indicated. 
The specimens collected by Dr. Murray had been sent from 
time to time to the British Museum, and he had received from 
the authorities of that institution lists of these consignments, 
along with a number of named duplicates, which were of great 
help in the identification of my own subsequent acquisitions. I 
have to acknowledge, with my sincerest thanks, the assistance I 
have received, not only from the staff of the British Museum, hut 
from several other friends. Mr. David Robertson and the Rev. 
Canon Norman, whose extensive knowledge of the British marine 
fauna is well known, were at Millport during the greater part 
of my stay there, and I had thus the advantage of being able to 
consult them constantly. Messrs. Isaac C. Thompson and TT. S. 
M‘Millan, of Liverpool, have been good enough to draw up lists 
of the Copepoda for me, and Prof. ITerdman has given me the 
benefit of his acquaintance with the Tuuicata. To Dr. John 
Murray, as above stated, I owe the suggestion of the present in- 
vestigation, as well as the means of carrying it out. 
