PIERCED,SHELES AND CHITONS 265 
Ischnochiton magdalenénsis, 
Hds., the Gray Chiton, Figure 
296, (Stenoradsia magdalen- 
ensis). This large and very 
common Chiton may be found 
under rocks at low tide, and 
can at once be recognized by 
its worn or roughly sculptured, 
low-arched valves, which are 
whitish internally, and gray or 
somewhat tinted externally. 
The mantle border is darker, 
and is covered with minute, 
solid seales. The foot of the 
animal is yellow. When taken 
from the rock it has a habit of curling up into a 
ball. The figure represents a good-sized specimen. 
Ischnochiton conspicuus, Cpr., the Conspicuous 
Chiton, resembles the last species, but is larger, 
more richly colored, with pinkish valves, while the 
mantle is densely beset with short bristles, giving 
it a velvety appearance. The length of this south- 
erm species 1s sometimes over 90mm. 
Ischnochiton merténsti, Midd., the Red Chiton, 
(Lepidopleurus mertensii), has an oval, elevated 
shell, with angular dorsal ridges and straight side 
slopes. The color is red, varying from orange to 
dark red-brown, and it is sometimes blotched with 
white. The valves are richly sculptured and are 
very beautiful when examined with a lens. The 
mantle border is covered with fine rounded seales ; 
