Page:First course in biology (IA firstcourseinbio00bailrich).pdf/358

 How does the tail of a shark or a gar differ from the tail of common fishes? (Fig. 228.) Do you know of fish destitute of scales? Do you know of fish with whiplike feelers on the head? (Figs.) Why are most fishes white on the under side?

Comparative Review.—(Copy table on one page or two facing pages of notebook.)