The Canadian journal of industry, science and art . Fig. 113. Fig. 118. a. last group, by one uninterrupted shallow groove or pallial impres-sion,—, a continuous line without any bend or sinus in it. Theexisting fresh-water genus Cyclas, species of which occur in our 118 A POPULAR EXPOSITION OF THE Post-Tertiary deposits, and especially in those of Western Canada,may be cited as an example of the present group. (See Paet V.) Finally, the moUusks of the fourth group, Sinu-Palilalia, possessa pair of long siphonal-tubes, capable of extension beyond the shell;and their two muscular impression
The Canadian journal of industry, science and art . Fig. 113. Fig. 118. a. last group, by one uninterrupted shallow groove or pallial impres-sion,—, a continuous line without any bend or sinus in it. Theexisting fresh-water genus Cyclas, species of which occur in our 118 A POPULAR EXPOSITION OF THE Post-Tertiary deposits, and especially in those of Western Canada,may be cited as an example of the present group. (See Paet V.) Finally, the moUusks of the fourth group, Sinu-Palilalia, possessa pair of long siphonal-tubes, capable of extension beyond the shell;and their two muscular impressions are united by a more or lesadeeply sinuated pallial line. Many of these lameUibranchs burrow
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