. The Canadian journal of industry, science and art. THE DEVONIAN FOSSILS OF CANADA WEST. 257 size from the middle of the shell outwards, the grooves between them rounded. Surface usually smooth, but when well preserved, with ^ne concentric striae. The mesial sinus is represented by the middle fiirrow of the ventral valve, and the fold by the middle rib of the dorsal. The ordinary width of this species is ten or twelve lines on the hinge line, but some are sixteen lines. In a specimen of this latter size the area of the dorsal valve is scarcely half a line high, and that of the ventral valve t
. The Canadian journal of industry, science and art. THE DEVONIAN FOSSILS OF CANADA WEST. 257 size from the middle of the shell outwards, the grooves between them rounded. Surface usually smooth, but when well preserved, with ^ne concentric striae. The mesial sinus is represented by the middle fiirrow of the ventral valve, and the fold by the middle rib of the dorsal. The ordinary width of this species is ten or twelve lines on the hinge line, but some are sixteen lines. In a specimen of this latter size the area of the dorsal valve is scarcely half a line high, and that of the ventral valve two-thirds of a line. The former lies nearly in the plane of the margins of the shell, while the latter slopes a little outwards. The beak of the ventral valve is incurved so as to project a little over the plane of the area, and its point is within half a line of the umbo of the dorsal valve. This species may be easily distinguished from 5. mucronata and S. varicosa, by the form of the ribs, which are round instead of angular, twice the size of those of the other species, and separated by rounded grooves. The mesial groove or sinus is only slightly larger and more conspicuous than those next it on each side. Locality and Formation.—Rama's Farm near Port Colborne. Near Woodstock. Collectors.—A. Murray, E. Billings. Spirifera fimbriata.—(Conrad ) Delthyris fimbkiata.—Conrad. Journal of the Academy of Nat- ural Sciences of P/iiladelphia, Vol. VIII., p. Fig. 69. Pig. 70. Fiji-. 68 Spirifera fimbriata.—Conrad. Dorsal view. Fig. 69. Side view. Fig. 64. Ventral view. Descrij)tion.—Transversely oval; hinge line shorter than the great- est -width of the shell; cardinal angles rounded ; mesial fold and sinus moderately rounded ; from three to eight obscure ribs on each side;. 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 resem
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