142 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
the earlier whorls; aperture, elongate and narrow; the anal sinus wide 
and shallow; pillar white, with anterior end attenuated; interior of aper¬ 
ture white, with three brown spiral bands, wide and dark, on the inside 
of the outer lip, but not visible on the exterior of the shell; the outer lip is 
sharp except when a varix is formed, when it is slightly reflected inward; 
operculum none; canal short, straight, and rather wide. Height of 
shell, 9; of last whorl, 5.3; maximum diameter, 2.25 mm. (Dali.) 
Type in Ottawa. Type locality, Barkley Sound, Vancouver Island, B.C. 
Range. Vancouver Island, B.C., to San Diego, California. 
Mangilia hebe Dali, 1919 
Proceedings of the United States National Museum , 56:63; PI. 20, fig. 10. 
Shell small, yellowish-white, slender, acute, with two smooth nuclear 
and five or six subsequent whorls; spiral sculpture of fine equal uniform 
threads covering the whole whorl separated by narrow grooves and given 
a frosty appearance by fine, sharp, incremental lines; axial sculpture of 
(on the last whorl, eight or nine) narrow, rounded ribs extending over 
the whole whorl with wider interspaces and somewhat constricted in front 
of the appressed suture; there is no evident anal fasciole apart from the 
constriction; aperture narrow, anal sulcus hardly evident, outer lip sharp, 
moderately varicose, smooth inside, with the spiral sculpture showing- 
through the thin shell; inner lip erased, pillar straight, canal produced but 
hardly differentiated. Height of shell, 10; of last whorl, 6; diameter, 
3.5 mm. (Dali.) 
Type in United States National Museum, No. 159338. Type locality, 
San Diego, California. 
Range. Known only from type locality. 
Mangilia tersa Dali, 1919 
Proceedings of the United States National Museum, 56:305. 
Shell small, thin, slender, acute, yellowish with a narrow peripheral 
brown band, which on the spire lies behind the suture; with seven and 
a half whorls, including the polished nucleus, which begins with a small 
coil, then becomes more inflated, and finally presents a peripheral keel 
before the normal adult sculpture begins; axial sculpture of (on the last 
whorl, 13) narrow, rounded ribs with much wider interspaces, extending 
over the base on the last whorl and most prominent at the periphery on 
the spire; there are also fine incremental lines which, in unworn speci¬ 
mens, make the sculpture minutely imbricated; suture distinct, appressed, 
and more or less undulated by ribs; anal fasciole wide, constricted, form- 
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