Happy Holidaysaurus!

In his sixth dinosaur book, Most clothes everyday saurian facts in the fun and excitement of holidays--both common and obscure. The mascot of Valentine's Day sweets, for example, is Deinodon, also called ``terror tooth.'' Antarctosaurus is the children's saint of ``Snow Day,'' when a severe storm shuts down schools. The lollipop palette of Most's cartoony oil-marker illustrations matches his chatty text. Although their purpose is to entertain, the connections between these jovial beasts and holidays may serve as a mnemonic device to help readers remember dinosaur traits and names. These 27 observations are a bit exhausting, but youngsters with an insatiable appetite for Mesozoic reptiles will eagerly plow through them. Ages 4-8. (Mar.)