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The works of Francis Maitland Balfour, Volume 2 (of 4)

Note 99 — Chapter IX

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The classification of the Mollusca adopted in the present chapter is shewn in the subjoined table:

I. ODONTOPHORA.

1. Gasteropoda.

a. Prosobranchiata.

b. Opisthobranchiata.

c. Pulmonata.

d. Heteropoda.

2. Pteropoda.

a. Gymnosomata.

b. Thecosomata.

3. Cephalopoda.

a. Tetrabranchiata.

b. Dibranchiata.

4. Polyplacophora.

5. Scaphopoda.

II. LAMELLIBRANCHIATA.

a. Dimya.

b. Monomya.

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