A Manual of Palaeontology for the Use of Students With a General Introduction On
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fishes, did not make their appearance till the commence- ment of the Secondary period, and seem to have reached their maximum in existing seas. The sub-kingdom Mollusca is divided into two great divi- sions, termed respectively the Molluscoida and the Mollusca Proper. The division Molluscoida comprises the three classes of the Polyzoa, Tunicata, and Brachiopoda, characterised by having a nervous system consisting of a single ganglion or prin- cipal pair of ganglia, whilst there is either no dis...tinct organ of the circulation or an imperfect heart. In the division of the Mollusca Proper are comprised the classes of the Lamelli- branchiata (Bivalves), Gasteropoda (Univalves), Pteropoda, and Cephalopoda. All these classes are distinguished by having a nervous system composed of three principal pairs of ganglia; whilst there is a well-developed heart, consisting of at least two chambers. CLASS POLYZOA OR BRYOZOA. Animal composite, forming colonies, all the members of which are produced by budding from a primitive being (zooid).
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