178 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
bituberculata, tuberculo supremo magno, prominente; labro fusco mar- 
ginato. (A. Adams.) 
Shell narrowly umbilicate, conoidal, solid, heavy, dull cinereous, more 
or less variegated by brown, blackish or red streaks; spire conoidal, gen¬ 
erally eroded and white or yellow at the apex; whorls, about five, obliquely 
striate, radiately coarsely and irregularly plicate and rugose above, some¬ 
times nearly smooth; periphery rounded; base convex, concentrically lirate; 
aperture oblique; columella strongly dentate in the middle or below it, with 
a second small tooth at the base; edge of the columella rather deeply curved 
above the tooth, but spreading at its junction with the whorl, bounding and 
somewhat narrowing the umbilicus by a white callus, which does not 
extend to the upper margin of the aperture; umbilicus deep, white within. 
Alt., 26; diam., 27. (Tryon and Pilsbry, Manual of Conchology.) 
Type in British Museum? Type locality ? 
Range. San Diego, California, to Acapulco, Mexico. 
Described as Chlorostoma rugosum A. Adams. 
Tegula regina Stearns, 1893 
Plate 98, figs. 5, 7 
Nautilus, 6:85. Proceedings of the United States National Museum, 16:350; PI. 50, 
figs. 6, 7. 
Shell conical, imperforate, black or purplish-black; whorls six to seven, 
concave, longitudinally somewhat obliquely plicated, the plicae more or 
less projecting at the suture, and on the edge of the basal whorl, producing 
an undulating or crenulated effect. Otherwise sculptured by incremental 
striae which traverse the surface and cross the plicae at right angles. Base 
concave, radiately, closely and prominently striated, more conspicuous, 
flattened, coalescing, and sinuously curving at the edge. Commencing at 
the point where the outer lip joins the body whorl, a shallow groove follows 
parallel to the periphery and extends toward the aperture, without inter¬ 
rupting the basal sculpture. Aperture obliquely subangulate, black-rimmed 
and crenulated on the thin edge of the outer lip; nacreous, silvery white 
toward the edge, bright lustrous golden yellow within and around the 
umbilical region, which latter though deeply pitted is not open. Columella 
white, calloused, arcuated with a moderately developed rib bounding the 
umbilical depression, and terminating in a single tubercle. This rib is 
paralleled by a shallow furrow terminating in a notch just below the 
tubercle, and by an exterior or outer ridge, part of the way double, of a 
brilliant orange color; this orange-colored rib is also exteriorly bounded 
by a shallow furrow which becomes obsolete toward the aperture. The 
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