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23. Family Trochidae. No 88. 89. An immense group of mollusks having handsome shells with pearly interiors, and marked externally with a great variety of elegant patterns and colors. Livona pica (No 89) is often used for food in The West Indies and Central America. Family Pleurotomariidae [[strikethrough]] No 90 [[/strikethrough]] (Not represented in the exhibit) A family abundantly represented in past geological ages, but now almost extinct. The few living species inhabit deep water. Their shells resemble Trochus maximus (No [[blank]])