A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . e changes, ending in the straight the various ammonite families that passed into Jurassicand Cretaceous times, the Stepheoceratidae gave off adegenerate branch so early as the Bajocian Age. Theeccentric Gadomoceras has already been noticed, and here Table-caseare exhibited the further uncoiled Spiroceras [Crioceras] and similar forms, which led to the straightBacidina of the Callovian. It was, however, chiefly towards the close of the T
A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . e changes, ending in the straight the various ammonite families that passed into Jurassicand Cretaceous times, the Stepheoceratidae gave off adegenerate branch so early as the Bajocian Age. Theeccentric Gadomoceras has already been noticed, and here Table-caseare exhibited the further uncoiled Spiroceras [Crioceras] and similar forms, which led to the straightBacidina of the Callovian. It was, however, chiefly towards the close of the Table-casesCretaceous Epoch that all the persisting races entered on -^^^^^^this degeneration. Names have been given to the various 3^stages of uncoiling, such as Crioceras, in which the whorlsare partly separate (Fig. 96 a); Macroscaphites with the lastwhorl bent slightly back and then returning on itself(Fig. 96 d); Sca2)hites with a somewhat closer coil to startwith and a more rapid return (Fig. 96 /); Hamites, whichstarts with a small coil, then goes straight for some distance, 172 GUIDE TO THE FOSSIL INVEKTEBEATE
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