SCRUPI, in natural history, the name of a class of fossils, formed in detached masses, without any crusts; of no determinate figure or regular structure; and composed of a crystalline or sparry matter, debased by an admixture of earth in various proportions. Under this class are comprehended, 1. The trigonia. 2. The petricaria. 3. The lithozaria. 4. The jaspides or jaspers.