PIERCED SHELESSAND CHITONS 267 
Nuttallina califormca, Nutt., the 
California Chiton, Figure 298, (Nut- 
tallina scabra), is a common species 
hving high up on the rocks which are 
left bare by the tides, hiding in ecrevi- 
ces which are ordinarily covered by a 
growth of Fucus. The coarse, rough 
valves are often much eroded, but Rie 2 
where the surface is presented it is of a dark color, 
and is sculptured with fine granules. The girdle 
is covered with short, stiff spinelets, of a brownish 
color. The foot of the animal is reddish, and the 
interior of the valves is bluish-green. Its length 
is about 37mm. 
The true Nuttallina scabra, Rve., the Sealy Chi- 
ton, is a southern species, much resembling the 
last, but having the individual valves very much 
shorter in proportion to their width. Color of 
valves lighter, more variegated. 
yihi Mopaha muscosa, Gld., 
the Mossy Chiton, Figure 
299, (Mopalia ciliata). 
This very variable species 
extends from the far north 
to San Diego. It may gen- 
erally be readily recog- 
nized by its hairy mantle- 
border, or girdle, which 
i wt a8 resembles a fringe of stiff 
Ape moss. The outside of the 
Blew? valves is sculptured, but 
this fact is often obscured by growths of seaweed 
or other organisms. The interior of the valves is 
a 
