In this article we will discuss about the structure of Cowries (Cyprea) with the help of a diagram. 1. Commonly known as "cowries" and are found among coral reefs in Indian and pacific oceans. 2. Shell external, shiny, convoluted brightly polished and remains lined internally by mantle so long the animal is alive. 3. Mantle bears numerous sensory papillae or [...]
In this article we will discuss about the structure of Terebra & Terebellum (Shankh) with the help of a diagram. 1. They are called "turret shells" and are marine molluscs. 2. They exhibit torsion and the nervous system is twisted in a figure of 8. 3. In these molluscs the left side has completely atrophied. 4. They have single [...]
In this article we will discuss about the structure of Sea lemons (Doris) with the help of a diagram. 1. Commonly called "sea-slugs" or "sea lemons" and are sluggish marine molluscs. 2. Body some what ovoid in shape convex dorsally and flattened ventrally. 3. External or internal shell absent. 4. Mantle large and anus is situated on postero-dorsal side. 5. [...]