Shell of Gastropoda:
　　Most shell of Gastropoda has a small rear water pipe in the rear of shell’s door and a water pipe in the front it. There may be some fold on the appearance of conch axis, convex teeth on the outside lips. Surfaces of shells are always closed shape, ear-shaped, gyro-shaped, screw-shaped, pear-shaped, spindle-shaped, violet-shaped and stick-shaped.

Shell of Lamellibranchia:
　　This kind of shell consists of 2 parts: the left and the right parts, which are connected by a ligament; when the two parts closing, it is easy to observe the shell from bottom to ligament. Surfaces of shells are always round disk-shaped fan-shaped, boat-shaped, paddle-shaped; minority of them are heart-shaped and irregular shape.

Shells of other classes:
The classes of Polyplacophora，Scaphopoda，Cephalopoda are consisting of much fewer species than the classes of Gastropoda and Bivalvia, much less morphological variations of the shells. Shells of scaphopods are entirely tusklike, and shells of cephalopods—a rare kind—mostly are in the same shape and size; polyplacophores, however, have their shell surfaces sculptured.

The growth of shells:
There are extraordinary similarities in shells of immature individuals and mature ones but for their size differences. Shells of bivalves keep on growing at the outer edges of two valves, without altering this orientation. Gastropods have their shells grown at the outer lips of their tubular shells while coiling itself in a spiral pattern.

The components of shells:
Calcium carbonate constitutes the most basal element of a shell, while other components are shell proteins, existing in the operculums of Gastropods. As the proteins are secreted layer by layer, the shells get harder and harder, some of which even give off luster of pearls. The hardy shells are increasing in size by gradual addition at the outer edges and getting thickened with the accumulated growth. In the brims of augmentation there are secretions such as scale-shaped granules, nodules, acanthoid granules and radial ribs. Owing to the periodicities and continuities of their growth, shells can show us beautiful and colored stripes.

Shell Connection:
Remove seashell flesh, odd parts and outside shell overgrowth from the shell, clean and dry the shell thoroughly, and place it in a sun-shaded confined place. Lastly, label each cleaned and dried-up shell based on their species for convenience of collection and future search.

Seashell habitats:
Mollusks have already got used to varied living environments, and different mollusks species can be found from sea rocks subject to year-long sea waves to dark and deep sea. Sea tide is imposing constant influence on mollusks living around seaside which varies their characteristics and distributions, while adequate sunlight provides them with abundant food. Mollusks likely fond of living in tropic sea where species of seashells are numerous that are hard to imagine.

Protection of habitats:
Human being shall try every means to protect life-forms’ habitats rather than giving them damages. Nearly every place underneath a piece of rock and coral reef is the home of a fauna and flora community, and any damage to it will make them vanished forever. Cutting a single piece of coral from a coral reef will cause other corals to die one after another. Similarly, if a sea beach is searched frequently by seashell collectors, such place as a natural habitat for life-forms will be certainly damaged to a level that no longer can be recovered. Therefore, it is our strong recommendation to respect and protect these living spaces for lower animals that are absolutely incapable to protect themselves.