. The elements of materia medica and therapeutics (Volume 2) . ed their name from the circumstance of their bearingtubes called polypes. They consist of two parts, a skeleton and afleshy portion. The skeletons vary in their consistence, and alsoin their position relative to the soft parts. They are soft and flexi-ble, or hard and calcareous. They are external and tubular, orinternal and solid. The fleshy portion may be, with respect to theskeleton, either external or internal. It gives origin to fleshy tubes(polypes), each of which, at its external orifice, is surrounded bytentaculcR. The calc
. The elements of materia medica and therapeutics (Volume 2) . ed their name from the circumstance of their bearingtubes called polypes. They consist of two parts, a skeleton and afleshy portion. The skeletons vary in their consistence, and alsoin their position relative to the soft parts. They are soft and flexi-ble, or hard and calcareous. They are external and tubular, orinternal and solid. The fleshy portion may be, with respect to theskeleton, either external or internal. It gives origin to fleshy tubes(polypes), each of which, at its external orifice, is surrounded bytentaculcR. The calcareous internal skeleton of Corallium rubrum, Lamarck(Isis nobilis, Pallas ; Gorgonia pretiosa, Ellis), is the Red Coral of theshops. It consists of carbonate of lime principally coloured withoxide of iron. Prepared Red Coral (Corallium rubrum nrcepara-turn) was formerly used in medicine, but it presents no advantageover chalk. Its powder, obtained by levigation, or an imitation ofit, is still kept in the shops, and is occasionally employed as a Corallium rubrum. Subdivision -RADIATA, Lamarck.—RADIATEANIMALS. Essential Characters.—Nervous system distinct, composed of filaments and rudimentaryganglia; the filaments arranged circularly around the buccal orifice (Cyclo-neura).No officinal substance is obtained from the Radiata. Subdivision III.—MOLLUSCA, Latreille.—MOLLUSCSOR SOFT ANIMALS. Malacozoa, Blainville.—Cylo-gangliata, Grant. Essential Characters.— Inarticulated animals with a soft not annulated skin. Cerebralganglia arranged circularly around the oesophagus. 1 C. White. An Account of the topical Application of the Sponge in the Stoppage of Hemorrhage. Lond. 1762.» On the Use of Sponge after Amputations, by Mr. T. Kirkland, in the Med. Obscrv. and Inq. vol. ii. p. 1764. COMMON EDIBLE OYSTER. 769 Class III.—CONCHIFERA, LkxcmcV.—CONCHIFEROUSMOLLUSCS. Essential Characters.—Acephalous, aquatic molluscs, with a bivalve or a multi
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