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THIS beautiful and very perfect Crustacean (from the collection of James Harrison, Esq., of Charmouth) was obtained from the zone of Ammonites Bucklandi of the Lower Lias of Tape-ledge, near Lyme Regis.
A complete detached fore-limb of large size, from the collection of E. C. H. Day, Esq., of Charmouth; an imperfect fore-limb, and perfect termination to a secondary limb, from the collection of Capt. Hussey; together with two fragmentary portions of limbs and abdomen, from the collection of Mr. J. W. Marder, of Lyme Regis, are all the remains of this new and very remarkable form hitherto discovered.
From the length of the fore-limbs, their monodactylous extremities, and also the peculiar spatulate form of the penultimate joint of the succeeding pairs of limbs, I am convinced of the propriety of placing it near Bronn's genus Megacheirus*, many species of which are described and figured in Münster's ‘Beiträge zur Petrefactenkunde,’ Part II., from the Lithographic Limestone of Solenhofen.
That genus has been obtained from the Oxford Clay of Wiltshire and Normandy, and from the Inferior Oolite and Lower Lias of Bavaria.
There are, in the British Museum, several examples of the genus Megacheirus from Solenhofen, and also from the Oxford Clay of Wiltshire; but I have only been able to refer to the figures and descriptions given by H. von Meyer and E. A. Quenstedt, of the species found in the Oxfordian Oolite of Normandy*, and those occurring in the Inferior Oolite
and Lower Lias
of Bavaria.
After careful comparison
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This 250-word extract was created in the absence of an abstract.
