. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. I ! 136 PROVINCE MOLLUSCA. MactriD/K—Example : Mactra, Gnathodon. Shell equivalve, triangular. Internal ligament in a deep triangular pit. Two di- verging cardinal teeth, and two lateral (Fig. 1:58). Mactra solUis- sima, the great clam, is the largest bivalve found on our coasts. Venkrid.^:.—Example: Venus, Cytherea, Petricola. Shell regular, closed, sub-orbicular or oblong, ligament external ; hinge with usually three diverging teeth in each valve. The most
. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. I ! 136 PROVINCE MOLLUSCA. MactriD/K—Example : Mactra, Gnathodon. Shell equivalve, triangular. Internal ligament in a deep triangular pit. Two di- verging cardinal teeth, and two lateral (Fig. 1:58). Mactra solUis- sima, the great clam, is the largest bivalve found on our coasts. Venkrid.^:.—Example: Venus, Cytherea, Petricola. Shell regular, closed, sub-orbicular or oblong, ligament external ; hinge with usually three diverging teeth in each valve. The most com- mon species on the Atlantic coast is /'efins mcicinaria the Quahaug or Wampum shell. Vitius (Totknia) '^cmma abounds at Gaspe. (Siphonida, iniegro-paiiiaiia.) Cvi'RiNiDil*;.—Example : Cyprina, Astarte, Cardita. Shell regular, equivalve, oval, solid ; epidermis thick and dark, cardinal teeth one to three, and usually a posterior lateral tooth, Cyprina Jslandica is our largest species ; and we have several species of Astarte ^XiCii Cardita borealis. (Figs. 146 ar ' 147.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, J. W. (John William), Sir, 1820-1899. Montreal : Dawson
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