One of the subdivisions of the Brachiopoda, including those that have the shells united by a hinge.

A subdivision of the Crinoidea.

One of the four subkingdoms in the classification of Cuvier. It has been much modified by later writers.

class of brachiopods with ventral teeth

A great division of the Animal Kingdom characterised generally by having the surface of the body divided into rings called segments, a greater or less number of which are furnished with jointed legs (such as Insects, Crustaceans, and Centipedes). 17