CLASS GASTROPODA 
139 
imperforate, twisted, and the pillar lip hardly thickened, slightly reflected. 
Height, 5; diameter, 4.5 mm. (Dali.) 
Type in United States National Museum, No. 214455. Type locality, 
U.S. Fish Commission, Station 4441, off Point Pinos, Monterey Bay, Cali¬ 
fornia, in 35 fathoms. 
Range. Known only from type locality. 
Velutina conica Dali, 1886 
Proceedings of the United States National Museum, 9:305; PI. 3, fig. 10. 
Shell solid, strong, white, with an imperceptible or extremely thin epi¬ 
dermis; finely striate in each direction, four-whorled, the last much the 
largest; suture narrow, but channeled; aperture oblique; axis within the 
columella not pervious to the eye; columella narrow, strong, with a light 
wash of callus, and no umbilical chink. Alt. of shell, 10.0; of aperture 
(parallel to the axis), 7.5; maximum lat. of shell, 7.6 mm. (Dali.) 
Type in United States National Museum. Type locality, Unalaska. 
Range. Aleutian Islands to Kodiak and Forrester Island, Alaska. 
Velutina zonata Gould, 1841 
Report on the Invertebrata of Massachusetts, 242, fig. 160. 
Shell oval-orbicular, compressed, pellucid, covered with a striped, cal¬ 
careous incrustation; inner lip flattened and channeled. (Gould.) 
Shell thin, opaque, white, and in some places pellucid, minutely striated 
both ways; whorls less than three, the first two minute, and not seen when 
the shell is viewed in front; the last, widening with great rapidity, becomes 
large, though it is not tumid, but appears rather depressed as it lies upon 
the aperture; the surface is covered with a chalky incrustation deposited 
by the animal, apparently instead of an epidermis; it is white or flesh- 
colored, and generally with numerous zones of brown, of various widths; 
when this is removed, the shell is left pellucid; aperture ovate, ample, 
nearly the whole length of the shell, more than double the size of the body 
of the shell; outer lip sharp and spreading; inner lip sharp-edged, but 
margined by a flattened, crescent-shaped, white, channeled space; the 
sharp edge is lost as it revolves within the shell, and a thin plate of enamel 
covers the space between it and the junction of the outer lip. Length, 
% 0 ; breadth, 1 % 0 m - (Gould.) 
Type in State Collection, No. 126. Type locality, Chelsea Beach. 
Range. Icy Cape, Arctic Ocean, to Monterey, California. Also Atlantic. 
[741] 
