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15.
Family Cassididae. No. 43. 44. 
The Helmet or Cameo Shells.
A noble group of mollusks, often having very large and handsome shells. Several of the larger species are composed of alternating layers of different colors, forming excellent material for cameo carving. 
Family Calyptraeidae, No. 48-49 [[strikethrough]] My Lady's Slipper [[/strikethrough]] ^[[ Slipper Limpets]]^ Cup and Saucer Shells. Boat Shell. The animals of this family attach themselves to rocks or other [[strikethrough]] shells or other [[/strikethrough]] ^[[hard]]^ objects, and ^[[in consequence]]^ their shells assume a great variety of odd forms. The Cup-and-Saucer Shell