Norrisia norrisii  The marine snail Norrisia norrisii is a medium-sized gastropod mollusk within the family Tegulidae. It has several common names, including Norris's top snail, Norris's topsnail, norrissnail, smooth brown turban snail, or kelp snail. It was first described by G.B. Sowerby I under the name "Trochiscus norrisii" (in honour of the naturalist Thomas Norris). The species has been found along the Pacific coast of North America from Monterey to Isla Asuncion on the Baja California peninsula in Mexico. Off the coast of California, with the exception of a persistent population in Diablo Cove, "Norrisia norrisi" primarily occurs south of Point Conception in the low intertidal and shallow subtidal zones. "Norrisia norrisii" has a wide, solid, shell that ranges in size from a few mm in juveniles up to 59 mm in adults, as measured across the greatest shell dimension. The shell is smooth, save for light growth lines and ill-defined spiral lines. It is brown or reddish fawn-colored, black around the umbilicus and greenish inside. Similar to other trochid snails, such as the more commonly occurring Chlorostoma species (or Tegula), the dextrally coiled shell of "Norrisia norrisii" is also more globose and shows a depressed-turbinate shape. The spire is low-conoidal. The minute apex is subacute, and spirally striate ; when perfect, the apical whorls are variegated. The 6 whorls widen rapidly. They are nearly plane and sloping above. Their edges project outside. They are pa23ery and rolled up like a spiral cord. The body whorl is very large. The thin peristome is simple. The sutures are plain. Other distinctive features include a smooth, green columella, an open, black-ringed umbilicus. The columellar margin is thickened at the base of the shell, and has a very obtuse tubercle there. The rounded-quadrangular aperture is angular above and brilliantly nacreous inside. It is sealed with an operculum made of protein rather than calcium carbonate. The operculum is circular, multispiral, with a central nucleus. The fleshy foot of the snail is a bright reddish orange with black speckling lining the basal margin.