TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 174 
species by the shores of Loch Fad is the more 
interesting, seeing that Haddin, as he states in his 
paper, failed to observe any Helicide at all along 
these shores. After referring to the distribution of 
several of the Helicide, he says: “It will be observed 
from the preceding remarks that I have not been 
able to record a single species from the banks of 
Loch Fad, while on the shores of Loch Ascog and 
Loch Greenan are found Zonites nitidus,” etc. He 
then goes on to say: “The reason of this I would 
not venture to affirm, but it is a fact worthy of 
note that the banks of the former are formed of 
shale, while those of the latter are of sand.” I am 
quite at a loss to understand how it happened that 
Haddin failed to observe any Helicidze on the shores 
or banks of Loch Fad, though his misapprehending 
their geological conditions might be more easily 
explained. The only plausible reason I can offer is 
that he had examined the shores of Loch Fad at a 
time when the weather was hot and dry, and when, 
as might be expected, few if any molluscs would be 
seen, whereas the very different results obtained by 
me were owing to the examination having been 
made in the morning while the air was cool and 
moist. As has been stated, a good number of species 
were observed, but they were nearly all of the 
commoner kinds—Vertigo substriata, V. antivertigo, 
and V. edentula being the only ones that could be 
considered uncommon or rare. As regards Loch 
Fad itself, although I got a boat and dredged a 
part of the loch, only the common aquatic forms 
‘were observed, as will be seen by referring to the 
list at the end of this paper. 
Before leaving Loch Fad, it may be stated that in 
a little patch of marshy ground on the south-east 
side, and about a quarter of a mile south-west from 
the embankment, an Ostracode was observed which 
had been known previously only as a Post-tertiary 
fossil under the name of Cypris browniana, Jones. 
The examination of living specimens from this 
