Sitting on the hand of a six-year old boy (it was big but not quite as big as it looks).
the shell cats eye as the stopper of the snail shell
In rock pools. Under water also. Big ones about 8 cams across.
saw these sea snails on the rocks in some of the wee pools of water.
cat's eye shell at Trumans beach
Found in somewhat rough surf waters on Coquina rocks
Observed filamentous brown tubes with rod like cells in middle, surface of tube was wrinkled. Also observed swaying motion to blades.
looks to be a diatom
Bacillariophyceae? looks like it
these look to me like Phylum Bacillariophyceae
Diatoms are a major group of algae, and are among the most common types of phytoplankton. Most diatoms are unicellular, although they can exist as colonies in the shape of filaments or ribbons (e.g. Fragilaria), fans (e.g. Meridion), zigzags (e.g. Tabellaria), or stars (e.g. Asterionella). Diatoms are producers within the food chain. A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule....