CYMBIUM. 
Puate VI. 
Species 3. (Fig. 4, c, d, Mus. Cuming.) 
Cymbium Broderipii, described and figured in its ma- 
turer and larger form in the preceding Plate, varies curi- 
ously in different stages of growth. In the youngest 
stage of well-marked varieties, Fig. 3¢ and 3 d, the shell 
is profusely reticulated, and obliquely streaked with dark 
olive-brown upon a yellowish ground ; but in a more ad- 
vanced stage, Fig. 3 6, the ground-colour of the shell is of 
a deeper orange hue, and the olive-brown colouring as- 
sumes a banded form, stretching into a freckle as if it 
were soon to disappear, as in the specimen Fig. 3a. This 
cannot, perhaps, be looked upon as a permanent rule of 
growth, as there are also young specimens with little or no 
marking. But no large specimens are known to have any 
marking, and a comparison of specimens of all ages shows 
undoubtedly a tendency in the painting organs of the 
animal to become enfeebled, just as, in the Melanie and 
other genera, the sculpture organs of the animal become 
enfeebled as it advances in growth. 
December, 1860. 
