. Handbook of zoology [microform] : with examples from Canadian species, recent and fossil :. Zoology; Invertebrates; Zoologie; Invertébrés. PROVINCE MOLLUSCA. 13T (^Asiplionida.') Uiiionitiae—ex. Unio, Anodon, Alasmodon.— Fresh-water shells, regular, equivalve, closed. Epidermis thick, shell nacreous within, ligament large, external. These arc the fresh-water mus- sels, and are very abundant in our streams and lakes. Unio complanatus is the most common species, Alasmodon (^Margaritana) margaritifera is the Pearl-mussel, and aflfords pearls sometimes of considerable beauty and value. Fig. 148.
. Handbook of zoology [microform] : with examples from Canadian species, recent and fossil :. Zoology; Invertebrates; Zoologie; Invertébrés. PROVINCE MOLLUSCA. 13T (^Asiplionida.') Uiiionitiae—ex. Unio, Anodon, Alasmodon.— Fresh-water shells, regular, equivalve, closed. Epidermis thick, shell nacreous within, ligament large, external. These arc the fresh-water mus- sels, and are very abundant in our streams and lakes. Unio complanatus is the most common species, Alasmodon (^Margaritana) margaritifera is the Pearl-mussel, and aflfords pearls sometimes of considerable beauty and value. Fig. 148. Fig. Alasmodon, (Margaiitana) MAnoAuiTiFKRA. ri- feies bho lie- Ive TrJ$;oiii4Sac—ex. Trigonia.—Shell equivalve, trigonal, with urnjones directed backward ; liga- ment external, with few diverging teeth, interior pearly. No living species in Canada; but the genus Lyrodesma of the Silurian is supposed to belong to this family. Arcaclac — ex. Area, Cucullaea, Nucula, Leda.—Shell regular, equivalve, with a long row. 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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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
