. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. FOSSILS OF TilK CARBONIFEROUS LIMESTONKS. m& beak is gently incurved, and exhibits a small circular foramen under its angular extremity. Length five lines, width five lines, depth threo lines. Fig. 94.—lihyiichoiiclla Acadienais, Davidson ; nat. size and " Of this shell I have seen but two specimens, which I detached from a lump of the Bro
. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. FOSSILS OF TilK CARBONIFEROUS LIMESTONKS. m& beak is gently incurved, and exhibits a small circular foramen under its angular extremity. Length five lines, width five lines, depth threo lines. Fig. 94.—lihyiichoiiclla Acadienais, Davidson ; nat. size and " Of this shell I have seen but two specimens, which I detached from a lump of the Brookficld shell-limestone, and of which one exhibited the twocurvcd internal lamellaicharacteristic of the genu& Rhynchonella. It is quite distinct from young shells of Rlnjnchondla pugnus and R. plcAirodon. In the last-named species the ribs that adorn the lateral portions of the dorsal valve are very much curved, while those of the ventral arc nearly straight, with their extremities bent upwards; in addition to which, the ribs begin to be longitudinally grooved along their median portion at some distance from the margin. None of these characters are observable in the small Rhynchonella under description. " Rhynchonella., sp.—Upon some fragments of Lower Carboniferous limestone brought from Nova Scotia by Sir C. Lycll arc several imper- fect, undeterminable valves of a Rhynchonella, which differs from the preceding species by its size, as well as by the number of its small radiating ribs. Of these last I have counted as many as thirty-five or forty upon each valve. In size it appears to have measured about seven or eight lines in length by nine in width. I abstain from proposing for it a specific denomination, as the material is so imper- fect. The specimen belongs to the Geological Society. " Rhynchonella pugnus (J), Martin, sp., Petrif. Derb., tab. 22, figs. 4, 5, 1809. " Two or three very small specimens, received from Dr Dawson after my plate had be
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