. The Canadian naturalist and geologist. Natural history -- Periodicals. Fig. 8. Fig. 9. Fig. 10. Fig. 8. Stricklandia lens, dorsal view. " 9. do. do., side view. " 10. Pentamerus Knightii, side view. I am not certain whether Fig. 9 is the true S. lens or a variety. It is more pointed in front than any of the English specimens that I have seen. Stricklandia, Gasp£ensis, Billings. Description.—Shell, large, oval; length to breadth about as five is to four ; valves about equally convex. The ventral valve has a shallow mesial depression which commencing at the beak in a point gradually
. The Canadian naturalist and geologist. Natural history -- Periodicals. Fig. 8. Fig. 9. Fig. 10. Fig. 8. Stricklandia lens, dorsal view. " 9. do. do., side view. " 10. Pentamerus Knightii, side view. I am not certain whether Fig. 9 is the true S. lens or a variety. It is more pointed in front than any of the English specimens that I have seen. Stricklandia, Gasp£ensis, Billings. Description.—Shell, large, oval; length to breadth about as five is to four ; valves about equally convex. The ventral valve has a shallow mesial depression which commencing at the beak in a point gradually enlarges to the front margin, more than half of which is affected by it; the dorsal valve has a corresponding mesial elevation, on each side of which there is sinus of just sufficient strength to induce the idea of a trilobed surface. The two valves are nearly equal, the ventral being the longest by about one line in a specimen five inches in length. The beak of the ventral valve is closely incurved over that of the dorsal and on each side of it there is a short area. The whole surface is covered with strong close rounded longitudinal ribs with rather sharp furrows between. These ribs are on an average one line wide at the front margin. This species, differs from all the others in its form, which is a nearly perfect ellipse, both ends being about equally rounded and the greatest width being in the centre of the length. The ribs are also more distinctly defined and proportionally more numerous than these of any other species. The average length is four inches; width three inches and a half; depth of both valves two inches and a 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 Natural History Society of Montreal. Montreal, Dawson
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