TOPS AND TURBANS. 239 
Norrista 
norrisi, Sby., 
the Smooth 
Turban - shell, 
Figure 264, 
(Trochiscus 
norrissil), 1s 
another south- 
ern species. 
The shell is 
Big 2204 quite smooth, 
and is of a rich brown color, the rim of the umbill- 
cus, curiously, being tinted with a bright green. 
The brown operculum is very shaggy, and the 
animal is beautifully tinged with red. The figure 
represents the size of a large specimen. 
Some of our choicest shells 
belong to the next genus, and 
one of the prettiest of all, is 
named Callidstoma annulatum, 
Mart., the Ring Top-shell. Fig- 
ure 265 represents a_ large 
specimen of this shell, which 
is thin and delicate, light brown 
in color, while the sutures are marked with a rich 
line of purple, and the whorls are traced with 
sculptured points. It is seldom found on the 
beach, but is obtained from the seaweed at some 
distance from the shore. Too delicate to bear the 
beating of the surf upon the rocks, its home is in 
deep water, where it clings to long seaweeds near 
MH/h | RCRA 
\\l 
Fig. 265, x 4 
