53 
Royal Microscopical Society. 
Gills exuding from end of back. Pink in colour, with dark blue 
and red spots ; only found two specimens, three and four inches 
long respectively. 
Palate, oo . 1 . oo, broad and short. Median very small, straight ; 
laterals hooked ; shape shown in side view. 
Boris, No. 19. — Hab., low water on rocks; only found two or 
three specimens, one to two inches long ; shape similar to 
B. Johnstoni ; light orange colour. 
Palate, a muscular band with a few irregularly-shaped concre- 
tions, can hardly be called teeth, distributed thereon without any 
apparent order. 
The accompanying drawings of the palates of Mollusca are 
of those that I obtained (with one exception, Littorina) at 
Williamstown, at the head of Port Phillip Bay, some thirty miles 
from the open ocean. 
They are the results of about three years’ collecting, and, I 
believe, include all the species of palate-bearing Mollusca to be 
found in that particular locality (the statements as to rarity or 
otherwise are only applicable to it), but they are far from repre- 
senting those of coast generally, as I have had no opportunity of 
collecting live shells elsewhere. 
All the drawings are made direct from the microscope with the 
camera lucida. The nature of some of the palates of the smaller 
Turbinidae is such that it is almost impossible, in mounting them 
in fluid, to prevent the edges from curling up, and I found great 
difficulty in seeing the second and third laterals of most of the 
limpets ; they seem to be rudimentary, and hardly worthy the 
name of teeth. 
The palates of the Turbinidae are all very beautiful ; some of 
them gorgeous when viewed with the polariscope and selenite plate, 
and they require a more skilful pencil than mine to show their 
beauty. 
There are some Strombidae, Volutidae, Cypraeidae, and a beautiful 
“ Paper Nautilus ” (Argonauta) on our coasts, that I have not yet 
met with alive, but it will be seen that at the spot where my 
gatherings were made most of the families of Marine Gasteropoda 
were represented. 
I have found two fresh-water shells (the most common is a 
Physa), and two or three others were forwarded to me by a friend, 
but a severe illness prevented me from mounting the palates, which 
were in course of preparation, for when I next was enabled to look 
at them they were destroyed. All their palates are of similar 
character to those of the Helicidse. 
I have seen only one land shell, that of a black snail (in our 
museum), but have not found any myself. The only localities in 
