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| $1. \text{ Osculum}$ | $p. \text{ Fasciola}$ |
| $2. \text{ Hypostome}$ | $q. \text{ Ctenoplana}$ |
| $3. \text{ Comb jellies}$ | $r. \text{ Spongilla}$ |
| $4. \text{ Hook and sucker}$ | $s. \text{ Meandrina}$ |
| Column $X$ | Column $Y$ |
| $(1)$ Skin without scales | $(P)$ Catla |
| $(2)$ Placoid scales | $(Q)$ Hagfish |
| $(3)$ Cycloid scales | $(R)$ Chameleon |
| $(4)$ Epidermal scales | $(S)$ Ray-fish |
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