A) Chiton
B) Nautilus
C) Dentalium
D) Pinctada
Correct Answer: A
Solution :
Molluscs are classified into 6 classes on the basis of symmetry, shell, mantle, gills, food, nervous system, muscles and radula. One of these 6 classes is Amphineura. (Gr. amphi = both, neuron = nerve). The main features of this class are as follows [a] Radula present [b] Marine habit [c] Non-ganglionated nerve ring around mouth with 2 pairs of interconnected nerve cord. [d] Elongated body with reduced heart. e.g.. Chiton or Coat of Nail shells
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