. Handbook of zoology [microform] : with examples from Canadian species, recent and fossil :. Zoology; Invertebrates; Zoologie; Invertébrés. I I ill 138 PROVINCE MOLLUSCA. of teeth in each valve. Several species of iVw- cula and Leda occur in v^ur seas. (Figs. 149,150.) Fif/. 149. Fig. 150. LlDA MINUTA, Mull. Leda (toldia) tuuncata, rost-pliocene. Mytilidac—ex. Mytilus, Modiola, Lithodo- mus.—Shell equivalve, edentulous, oval or elon- gated, closed, umbones anterior, epidermis thick, attached by a byssus. The common mussel is Mytilus edulis. (Fig. 151.) The horse mussel is M. modiolus. Fig. 15
. Handbook of zoology [microform] : with examples from Canadian species, recent and fossil :. Zoology; Invertebrates; Zoologie; Invertébrés. I I ill 138 PROVINCE MOLLUSCA. of teeth in each valve. Several species of iVw- cula and Leda occur in v^ur seas. (Figs. 149,150.) Fif/. 149. Fig. 150. LlDA MINUTA, Mull. Leda (toldia) tuuncata, rost-pliocene. Mytilidac—ex. Mytilus, Modiola, Lithodo- mus.—Shell equivalve, edentulous, oval or elon- gated, closed, umbones anterior, epidermis thick, attached by a byssus. The common mussel is Mytilus edulis. (Fig. 151.) The horse mussel is M. modiolus. Fig. Mytilus edulis, Lin. AvicialUlac—ex. Avicula, Meleagrina, Shell inequivalve, very oblique, hinge-line straight and eared or winged posteriorly; attached by a byssus. We have no modern species, but several in the Palaeozoic rocks. (Figs. 152, 153.) Ostrcadac—ex. Ostrea, Anomia, Pecten, Spon- dylus, Plicatula.—Shell inequivalve, free or adhe- rent, resting on one valve. Beaks central, straight, ligament internal, adductor impression single, hinge usually edentulous. The common oyster, 0»trea •- ?. 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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