68 WEST AMERICAN SHELLS 
tric, rounded ridges, some of which divide into 
two. 
Pitaria newcombiana, 
Gabb, Neweomb’s Pit- 
aria, Figure 953, has 
been found in moderate- 
ly deep water from 
Monterey southward. It 
is thin and delicate, with 
zigzag, brown markings, = 
and a papery epidermis. Bigs See 
Figure 54 gives a bold 
picture of Cytheréa for- 
di, Yates, Ford’s Cythe- 
rea, which is found from 
the Santa Barbara Is. to 
Panama: tric awery 
thick and heavy, and has 
a very deep lunule. It 
reaches a length of two 
and a half inches. This 
is the shell which passed 
for years as Venus toreuma, Gld., but that is found 
to be a distinct Polynesian species. 
The Saxidomes of this coast have recently been 
revised by Dr. Dall, and the numerous names 
reduced to two. The first is Savidomus nuttalli, 
Conr., Nuttall’s Saxidome, shown in Figure 55. 
Tt includes the old Saxidomus aratus, Gld. The 
shells are usually marked by rough concentric 
ridges, as shown in the figure. When young, there 
are brownish markings near the beaks, with a 
Fig. 54 (*) 
