The Mollusca, or soft-bodied animals, of whose protecting shells your collection consists, form a sub-kingdom, and are subdivided into four classes:—
- Cephalopoda.
- Gasteropoda.
- Pteropoda.
- Lamellibranchiata (or Conchifera).
And these again into Families, Genera, and Species.
The space at our disposal being limited, it is impossible to do more than furnish some general outlines of the different forms. For further details it will be necessary to refer to one of the larger works, a list of which will be found on the last page.
Fig. 4. Argonauta Argo.
Fig. 5. "Bone" of Sepia officinalis.