160 WEST AMERICAN SHELLS 
Drillia incisa, Cpr., the Incised Drill, is an in- 
habitant of Puget Sound. Its shell is similar in 
shape to Figure 144, but is smaller, being but a 
little over an inch in length. Its surface is ash- 
eolored, with reddish, revolving lines. 
The genus Bela includes a large number of small 
shells, most of them from the north, and some of 
which are obtained by dredging. They are decid- 
edly spindle-shaped, and many of them have the 
characteristic notch in the outer lip near the upper 
end of the aperture. The name of many species 
will be given in the List, but on account of their 
small size and rare occurrence they will not be 
farther deseribed. 
Figure 147 shows the shell of the 
pretty little species named Mangiha 
merita, Gld., the Ribbed Mangilia. It 
has six whorls and the surface is marked 
by high ecross-ridges and fine spiral lines. 
It is a white shell and is usually less than 
half an inch in length. 
Mangilia variegata, Cpr., the Variegated Man- 
Fig. 147, x 3 
gilia, is similar to the last, but it has more raised 
ridges. The shell is thin, yellowish in color, espe- 
cially around the aperture, though the spire is apt 
to be darker. Large specimens reach a length of 
10mm. It is found on the coast of southern Cali- 
fornia. 
