A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . , differs from Naittikisin the folding of its sutures, well seen in ^. ziczac. Further information concerning the fossil Nautiloidea inthe Museum is given in the first two volumes of the Catalogue of the Fossil Cephalopoda issued by the Trusteesin 1888-91. Order—AMMONOIDEA. One of the earliest straight-Table-eases shelled forms that can without doubt be referred to thisW^l cases ^^^^^ Devonian Badrites (Fig. 81 h), in which the 3-6 & 9-12. septa are still unfolded
A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . , differs from Naittikisin the folding of its sutures, well seen in ^. ziczac. Further information concerning the fossil Nautiloidea inthe Museum is given in the first two volumes of the Catalogue of the Fossil Cephalopoda issued by the Trusteesin 1888-91. Order—AMMONOIDEA. One of the earliest straight-Table-eases shelled forms that can without doubt be referred to thisW^l cases ^^^^^ Devonian Badrites (Fig. 81 h), in which the 3-6 & 9-12. septa are still unfolded, but which has a protoconch (seemodel. Table-case 1) and its siphuncle marginal, , near theouter shell-wall. We have already seen, in such a form asMimoceras compressum (Fig. 81 n), how the straight shellbecame coiled first in its old age, and how in more advancedforms the coiling began at an earlier and earlier stage of thelife-history, until even the protoconch was affected by many of the earlier Ammonoidea the protoconch can stillbe seen distinctly (Fig. 93 a), being uncovered by later whorls.
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Keywords: ., bookauthorbr, bookcentury1900, bookdecade1900, booksubjectfossils
