The Atlantic Kitten's Paw, Plicatula gibbosa Lamarck, 1801, is often found in beach drift at University Beach, Corpus Christi Bay, Texas.

Its shell is trigonal but can be irregular, with thick radial undulations and commarginal growth marks. Fresh shells (like the one in the photos here) have purple-brown maculations in thick commarginal bands, interwoven with thin irregular lines.

The shell can grow to about 25 mm in diameter (1 in). It is distributed from North Carolina to Florida and south to Brazil, and in the Gulf of Mexico to Texas.

Read more about this species in Tunnell et al (2010)’s Encyclopedia of Texas Seashells, page 331, and in the upcoming Texas Seashells, A Field Guide, on page 176.