In this article we will discuss about the structure of Nautilus Shells with the help of a diagram. 1. The present specimen is the dry shell of Nautilus. 2. Nautilus is marine and cosmopolitan animal and is commonly called "pearly nautilus" and it is found in deep coastal waters. 3. The shell is spirally coiled and is divided into a [...]
In this article we will discuss about the structure of Octopus with the help of diagram. 1. It is commonly called as “sea-devil” and is a marine and cosmopolitan animal. 2. It is normally found in holes or crevices or under stones along sea bottom. 3. Body globular and is divided into visceral hump and head. The head is comparatively [...]
The below mentioned article provides notes on Mollusca (snail). The molluscs (mollis = soft) are soft-bodied animals with a hard external or internal shell. The phylum includes forms like chitons, snails, slugs, clams, oysters, sepia, loligo, octopus, etc. Generally aquatic, some terrestrial and amphibious forms are also present. In Mollusca A muscular foot is present as the thickening of the [...]