\ 
fre: N ATi us. 
VoL. XI. DECEMBER, 1897. No. 8. 
; — 
NEW WEST AMERICAN SHELLS. 
IBY W. Heep AE: 
Sigaretus Oldroydii Dall, n. sp. 
Shell large, thin, naticoid, with a short spire and 3-4 inflated 
whorls ; color pale brown, livid on the spire, fading to waxen on 
the base; surface sculptured with extremely fine wavy spiral striz ; 
aperture ample, oblique, the outer lip thin, a little patulous, the 
body covered with a thin callus, the pillar lip obliquely cut away, 
wide near the junction with the body, the basal part of the margin 
receding ; umbilicus large, pervious, its walls covered with a thin, 
silky, brown wrinkled epidermis. Alt. 35, diam. 37 mm. 
A single specimen in deep water off Catalina Id., Cala., collected 
by Mr. and Mrs. T. 8. Oldroyd. 
This species is easily distinguished from any other recorded, by 
its very thin shell, naticoid form and wide pervious umbilicus. 
Pecten Palmeri Dall, n. sp. 
Shell thin, orbicular, compressed, equilateral, white to yellowish- 
brown, with concentric or zig-zag narrow bands or flecks of dark 
rose color; 15 strong ribs rounded in the young, mesially keeled 
and longitudinally threaded in the adult, separated by narrower 
channelled interspaces, each with a mesial thread; all crossed by 
lamellose, concentric, rather sparsely distributed elevated lines; sub- 
margins and ears closely radially threaded with imbricated threads. 
Both valves similarly sculptured ; alt. 47.5, lat. 538, diameter about 
20 mm. 
