Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 FAMILY OF CARDIACEA. 83 LESSON VI. Family of Cardiacea.—Cardium—Donax—Cyclas—Corbis — Tellina — Venus—Petricola—Venerupis—Mactra. Family of Inclusa.— Lutraria—Mya—Byssomia—Hiatella — Solen— Sanguinolaria— Pholas— Teredo— Fistulana—' Gastrochmna—Clavagella—Aspergillum. Class of Mollusca Brachiopoda.—General Characters-— Lingulo—Terebratula—Orbicula. Class of Mollusca Tunicata, or Acephala Nuda.—Biphora —Ascidia—Botryllus—Pyrosoma, OF ACEPKAIiA, CONT
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 FAMILY OF CARDIACEA. 83 LESSON VI. Family of Cardiacea.—Cardium—Donax—Cyclas—Corbis — Tellina — Venus—Petricola—Venerupis—Mactra. Family of Inclusa.— Lutraria—Mya—Byssomia—Hiatella — Solen— Sanguinolaria— Pholas— Teredo— Fistulana—' Gastrochmna—Clavagella—Aspergillum. Class of Mollusca Brachiopoda.—General Characters-— Lingulo—Terebratula—Orbicula. Class of Mollusca Tunicata, or Acephala Nuda.—Biphora —Ascidia—Botryllus—Pyrosoma, OF ACEPKAIiA, CONTINUED. 1. The Family of Cardiacea is characterized by having the mantle open in front, and prolonged posteriorly into two tubes, which are sometimes distinct, and at others united in a single mass ; one of them a {Jig- 105, r) serves for respi- ration, and the other (e) for the passage of excrement.— This mode of conformation is p recognised in the shell by the impression made by the at- tachment of the edge of the mantle, called the pallial line {fg. 106, Z), which before joining the posterior muscular • impression or cicatrix (m), curves more or less deeply in- l wards. In all these mollusks, there is a transverse muscle and a foot {fg. 105, p), which generally enables the animal to crawl. The species of Cardia- cese that have long tubes, ordi- narily live buried in the sand or Fis. 106.—vENERUPis. mud. Fig. 105.—TELLINA.
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