Tectus

Tectus is a genus of sea snails, marine gastropod mollusks in the family Tegulidae. The shell has a pyramidal shape. Its base is flat, without false-umbilicus. The rhomboidal aperture is very oblique, angular, and wider than long. The outer lip is lirate within. The columella is very short, vertical, with a strong spiral fold, ending anteriorly in...
Found on http://en.wikipedia.org/wiki/Tectus

Tectus

(from the article `top shell`) ...are common along temperate Atlantic shores, while those of Tegula and Calliostoma are abundant in the Pacific. Tropical top shells such as ...
Found on http://www.britannica.com/eb/a-z/t/20
No exact match found