. The Canadian journal of industry, science and art. Fig. 59. Fig. 60. Fif;. Fig. 62. Pig. o9 Spirifera wmcrowato.—Ventral view. Fig. 60. Side view. Fir. 61. Dorsal view. Fip:. 62. A long-winged variety of the same species. Description.—This species varies from the semi-circular to the sub- triangular form. In general the hinge line is twice, and sometimes thrice the length of the shell; the cardinal angles acute, the side either straight or gently rounded and converging to the front margin, which is either straight or concave, and of the width of the mesial fold. The valves are moderatel
. The Canadian journal of industry, science and art. Fig. 59. Fig. 60. Fif;. Fig. 62. Pig. o9 Spirifera wmcrowato.—Ventral view. Fig. 60. Side view. Fir. 61. Dorsal view. Fip:. 62. A long-winged variety of the same species. Description.—This species varies from the semi-circular to the sub- triangular form. In general the hinge line is twice, and sometimes thrice the length of the shell; the cardinal angles acute, the side either straight or gently rounded and converging to the front margin, which is either straight or concave, and of the width of the mesial fold. The valves are moderately convex ; the ventral more tumid than the dorsal; the mesial fold and sinus are rounded, and extend quite to the beaks; from fifteen to twenty not very prominent ribs on each side. The area of the ventral valve is very narrow, in the largest specimens scarcely more than half a line in height; the beak small, pointed and incurved over the area, but not in contact with, the. 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 Canadian Institute. Toronto : Canadian Institute
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Keywords: ., bookcentury1800, bookdecade1850, bookpublishertoron, bookyear1856
