FAUNA OF THE CLYDE SEA-AREA. 
445 
Before proceeding to enumerate the species obtained, it seems 
advisable to say a few words regarding the mode of procedure 
adopted in collecting, for tins probably explains certain general 
features in the results obtained. In the great majority of in- 
stances the instrument employed was a shrimp-trawl, which was 
found on the whole more convenient for working in these loca- 
lities than the dredge, owing to its bringing up a less amount of 
mud and a greater variety of forms. Certaiu groups, such as 
the Mollusca, are not obtained in such large numbers as by the 
dredge, and hence the list of these animals obtained is small as 
compared with that known to inhabit the district. 
A tow-net was generally attached a short distance above the 
trawl, so as to capture any Crustaceans which might be swimming 
just above the bottom. These were almost invariably found to 
be of a different species from those taken in the nets which were 
dragged at the surface. 
Statement of Results. 
For convenience I have drawn up the results in the form of a 
Table, with a column corresponding to each basin. The figures 
show the range in fathoms in that particular region, whilst there 
is appended in another column a sketch of the distribution of 
each form outside the British area. Those facts which have been 
taken from the published writings of others are indicated by 
italics. A note of interrogation indicates that I have obtained 
the species in that locality, but the record of the exact depth 
has been lost. d means that dead shells, not living specimens, 
were obtained. 
