MALACOZOA. MOLLUSCA. 



SOFT, symmetrical, inarticulated animals; enveloped 

 in a muscular skin or mantle, which generally has 

 attached to it, externally or internally, a calcareous 

 part or shell, of one or several pieces ; and hav- 

 ing a complete double circulation, with white 

 blood ; branchial or pulmonic respiration ; an in- 

 testinal canal with two apertures ; a nervous system 

 composed of a cerebriform ganglion, placed under 

 or surrounding the oesophagus, and communicating 

 with the ganglia of the various functions ; those 

 subservient to locomotion being lateral. 



MaXa/aa and 'Oo-TpaKoSeppa, Aristotle. M6llia and 

 Testacea, Pliny. Vermes y Ray, Linnaeus, Pennant. 

 Mollusca, Cuvier. Malacozda, Blainville. MaXa/cos, soft ; 

 Za>o*>, animal. 



