CURIOUS CRABS. 
Crabs, though adhering closely to the fundamental type of structure, are extremely varied in form and colour. Slight modifications of 
trunk and limbs produce striking differences in general appearance, and fit them for diverse modes of life. Some swim with ease in 
the upper waters, some burrow in the sandy bottoms, others are spider-like and climb the branches of seaweeds, or are got up to resemble 
stones and thus escape the attentions of enemies. 
