13a Extinct marine arthropods with an exoskeleton divided into three parts? (10) 14a Polysaccharide occuring in plant tissues? (6) 15a Sub-order of reptiels that comprises the snkes? (7) 41a Nocturnal African mammal feeding on termites? (8) 43a System that converts rotary action into linerar motion as in a steering wheel? (4-3-6)