The Canadian journal of industry, science and art . Fig. 108. Fig. Pig. 107 :—This genus has been recentlyestablished by Mr. Billings. It includes cer-tain more or less oval forms with nearly equalvalves, formerly referred to Pentamerus, , a Devonian species, is shewn in fig. species occur in these and in the UpperSilurian rocks. Our Canadian formations do not appear, asyet, to have offered any examples of the well-known genera, Crania, Calceola, and Terrebra-tula. Lambllibeanchiata (or Conchifeea.)—Lamellibranchiate mol-lusks are marine or fresh-water a
The Canadian journal of industry, science and art . Fig. 108. Fig. Pig. 107 :—This genus has been recentlyestablished by Mr. Billings. It includes cer-tain more or less oval forms with nearly equalvalves, formerly referred to Pentamerus, , a Devonian species, is shewn in fig. species occur in these and in the UpperSilurian rocks. Our Canadian formations do not appear, asyet, to have offered any examples of the well-known genera, Crania, Calceola, and Terrebra-tula. Lambllibeanchiata (or Conchifeea.)—Lamellibranchiate mol-lusks are marine or fresh-water animals of the acephalous are provided in the adult condition with laminated gills orbranchiae for breathing purpose?, (as seen, for example, in the so-called beard of the oyster,) and they secrete a bi-valve externalshell. The two valves in most genera (those of the Ostreidce andsome Aviculidce are the only exceptions) are of equal size, butalways more or less inequilateral. (See under the Braehiopodsabove). These raollusks are exceedingly abundant in th
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