162 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Olivella biplicata parva T. S. Oldroyd, 1920 
Plate 26, figs. 16, 16a 
This variety is nearest angelina, but much smaller, a little broader in 
proportion; outer lip more curved, shell more highly colored and variable 
in color. (T. S. Oldroyd.) 
Type in Oldroyd Collection, Stanford University. Type locality, Point 
Abreojos, Lower California. 
Range. Living, Lower California; fossil, Lower Pleistocene, San 
Pedro, California. 
Olivella porteri Dali, 1910 
Nautilus, 23 :133. 
Whorls about seven, spire acute with a very deep and narrow channeled 
suture not obscured by callus ; surface of the whorl brilliantly polished, 
smooth, except for microscopic spiral close striation which is present on 
all, but more uniform on particular individuals; color pale olive, yellow, or 
whitish, with sharp angular axial brown lines superposed between the 
suture and the basal fasciole, sometimes forming a tent-like pattern and 
sometimes reduced to fine, close, more or less cloudy zigzags; a pale band 
in front of the suture, usually with a vivid brown zigzag pointed forward, 
but sometimes plain, the brown lines when present broader and stronger 
than elsewhere; basal fasciole short, with a marginal and an adjacent nar¬ 
row fold or plait anteriorly, lighter than the body, yellow or rich bluish- 
purple ; aperture narrow, simple, with a deep sutural sinus and a moderate 
parietal callus when mature. Height of shell, 15; of aperture, 9 mm. 
(Dali.) 
Type in United States National Museum, No. 209677. Type locality, 
San Diego, California. 
Range. Redondo, California, to Magdalena Bay, Lower California. 
Olivella pedroana Conrad, 1855 
Pacific Railroad Reports, 5:327; PI. 6, fig. 51. 
Small, elliptical; spire conical, about equal in length to the aperture; 
base of columella with a prominent fold. A small abundant species, some¬ 
times water-worn, without any prominent character, except the fold at 
the base, which is more conspicuous, considering the size of the shell, than 
is usual in the genus. (Conrad.) 
Type in ? Type locality, San Pedro, California. 
Range. Puget Sound to Cape San Lucas, Lower California. 
f 162 ] 
