78 THE ZOOLOGIST. 
For example, “ Han.” for Hancock applies equally to Hanley; “ Sch.” for 
Schumacher might mean Schubert; and “ Bro.” for Brown might also be 
a contraction for Broderip or Brot. With these amendments, it seems to 
us, the utility of the list would be enhanced. 
Observations on Marine Gastropoda. —I have many kinds of 
Mollusca in my aquaria, and am studying their habits, and also the causes 
which tend to produce variation in the forms and colours of their shells. 
The species are both freshwater and marine, but I shall confine myself in 
these notes to the latter, and of these shall only remark on the univalves. 
The most hardy are the specimens of Littorina littorea, of which I have 
a goodly number, in all stages of growth. This common and well-known 
species breeds very freely in confinement. The young shells are very 
different in shape to mature ones, being more tapering and slender, 
with proportionately longer spires. Their shells are brown and semi- 
transparent,and are several months before they begin to thicken. Possibly 
they may grow more slowly in an aquarium than in the sea, for some 
individuals which I specially observed were quite a year before they began 
to assume the normal shape of the adult. They seem to be long-lived, 
for one particular specimen, which J introduced into a vase when of a 
similar size to the average of those exposed for sale in fishmongers’ shops, 
has lived in the aquarium for ten years. The shell has enormously 
thickened, and become of a greenish-white colour. Judging by the rate at 
which those have grown which I have had from the egg-state, its age when 
first introduced could not have been less than ten years, and probably 
more. It must, then, be upwards of twenty years old now. Nassa 
reticulata and N. incrassata I have little difficulty in keeping alive fora 
long time, although they never breed with me, to my great regret, as 
I much desire to watch the life-history of both these and other species. 
‘They like shallow water best, and spend much of their time out of it 
altogether, just as the periwinkles do. The food they prefer is a piece of dead 
mussel, and their sense of smell is evidently very keen, for they soon scent 
their rations. Their time for feeding is always night, and they are very 
quiet and apparently asleep in the daytime; but, by taking a light to the 
aquarium after dark, they may be observed awake and active. In default 
of a piece of mussel they will eat the flesh of a dead fish or some scraped 
meat. Purpura lapillus, on the contrary, can never be induced to touch 
the scraped meat I offer them, and I do not succeed in keeping them more 
than a few months. I have the same difficulty with Buccinwn undatum.— 
AtBrerr H. Waters (Cambridge). 
The Locality for Limnza involuta, Thompson. —- In the ‘ Journal of 
Conchology’ for September last Mr. Wilfred Bendall writes as follows :— 
“Cromaglaun Mountain is seven miles from Killarney, on the road to 
Kenmare. ‘There is no Cromaglaun Lake, as stated by some conchologists. 
