Along Came a Spider - A novel by A G Cascone(The third book in the Deadtime Stories series)
(1996)
The dusty old science kit under Mikey's bed is full of creepy, crawly, disgusting creatures. They're all in jars... and all long dead. At least they're supposed to be. But when Mikey and his best friend, Max, open the jar with the man-eating spider inside, they're in for the shock of their lives.