MARINE UNIVALVES 173 
its ill-omened name, for there is nothing direful 
in its appearance, though its color is dark and 
mournful. It is also called Kuthria dira. 
Chrysodomus liratus, Mart., the Ridged Spindle- 
shell, is a large Alaskan species, with a light brown 
shell some three inches long, swollen in the middle 
and pointed at both ends. The chief feature is 
the set of about ten strong ridges, or carine, which 
circle around the shell in a spiral manner, lead- 
ing back from the outer lip to the very apex. I 
obtained a fine specimen on Wrangel Island. 
Figure 167 gives a good 
idea of a somewhat similar 
shell known as Chrysodomus 
tabulatus, Baird, the Tabled 
Spindle-shell. It lives along 
the coast from Vancouver 
Island southward, inhabit- 
ing deeper and deeper water 
on the way. A _ beautiful 
specimen  was_ recently 
dredged in Monterey Bay. 
The shell is of a yellowish 
white color, though some- 
times darker, and can be 
readily identified by the 
tabulated whorls, with their 
flat tops. 
Chrysodomus kelléttiz, 
Forbes, Kellett’s Spindle-shell, (Siphonalia kel- 
lettii), is one of the largest of our mollusks. The 
Fig. 167, x 3 (*) 
