158 WEST AMERICAN SHELES 
right, instead of in the usual way, and it is a 
‘‘Notch-side’’ for a very obvious reason, which 
the picture so clearly shows. This species is 
dredged off southern California, and is also found 
in a fossil condition. 
Pleurotoma tryoniana, Gabb, Tryon’s Notch- 
side, resembles Figure 140, but the whorls are 
convex, angular, and ornamented by a row of 
nodes on the angle. It has been hauled up alive in 
the fishermen’s nets at San Pedro. 
Pleurotoma 
Fig. 143, x 3 (*) 
vinosa, Dall, the 
Tipsy Notech-side, is shown in Fig- 
ure 142. This is a northern species, 
found around the Aleutian Islands 
and that vicinity. It was described 
by Dr. Dall in 1874. 
Figure 143 intro- 
duces us to another 
northern shell, 80 
mm. in length. Its 
home is in Bering 
Sea, and its name 
is Pleurotoma cir- 
cinata, Dall, the Girdled Noteh- 
side. As shown in the figure 
each whorl is ornamented with a 
raised belt or girdle, from which 
fact it takes its name. The aper- 
ture is large, being half as long 
as the whole shell. Several other 
rare species of this genus will be 
mentioned in the List. 
Fig. 142, x $ (*) 
