San Diego County, California, US
These are all hexagonal in cross-section, as you can easily tell if you roll them between your fingertips.
Fossilized sp from Big River, Kahurangi. One of a number of species appearing in this rock series.
Piece is c 60mm long. It is interesting that the shell has fallen onto a coarse gritty layer and is covered in a much finer sediment, or viceversa
A single, empty shell of the Texas Tuskshell, Paradentalium americanum, was collected by dredging near Port Aransas, at a depth of about 10 m. It was found during a field trip on the R/V Katy.
The species is discussed and illustrated in the Encyclopedia of Texas Seashells, p. 390. It can also be found in BioGoMx at:
The tusk shells or scaphopods are a class of shelled marine molluscs. The scientific name of this class is Scaphopoda, meaning "shovel-footed". Shells of species within this class range from about 0.5 to 15 cm in length. Members of the Order Dentaliida are generally significantly larger than those of the Order Gadilida.