CYMBIUM. 
Prats VII. 
Species 4. (Fig. 4a, Mus. Brit.) 
CymBiuM DucALE. Cymb. testd oblonga, vel ovata, vel 
rotundato-ovatd, pallidé luted, undique maculis casta- 
neis wrregularibus biseriatim cinctd, venis rufis vel us- 
tulato-aurantiis undique trigono-reticulatd, spird pro- 
Sunde immersd, anfractibus superné angusté rotundatis, 
sparsim squamatis, squamis primum brevibus, deinde 
cito elongatioribus, distantioribus, partim castaneo 
tinctis ; columellé, triplicata. 
THE pucAL Cymsium. Shell oblong, or ovate, or rotun- 
dately ovate, pale yellow, encircled with two bands 
of irregular chestnut blotches, and everywhere trian- 
gularly reticulated with red or burnt-orange veins, 
spire deeply immersed, whorls narrowly rounded at 
the upper part, sparingly scaled, scales at first short, 
then quickly more elongated and distant, partially 
chestnut blotched ; columella three-plaited. 
Voluta ducalis, Lamarck, Anim. sans vert. vol. x. p. 377. 
Melo umbilicatus, Broderip. 
Hab. Moreton Bay, Australia. 
The very beautiful Cymbium represented in this and the 
three following Plates I assign to Lamarck’s Voluta du- 
calis. All the specimens that I have seen, including a 
series in the British Museum in all stages of growth, 
from little more than an inch in length to a size larger 
than could be got into our Plate, are distinguished by a 
peculiarity of painting that is well defined in the original 
description of Lamarck, namely, an elaborate network of 
fine reddish- or burnt-orange veins, crossed by two rather 
distant bands of chestnut blotches. In a figure of the 
species given by Schubert and Wagner, in their Supple- 
ment to the ‘Conchylien Cabinet’ of Martini and Chemnitz, 
this peculiarity of painting is equally well defined; but 
both the description of Lamarck and the figure of Schu- 
bert and Wagner are taken from young specimens before 
the spire had beome immersed by the corona of rapidly 
enlarging scales, in which maturer state the species is the 
Melo umbilicatus of Broderip. 
December, 1860. 
