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It is represented in the present seas by the delicate and rare Pentacrinus caput-medusae of the Antilles, which, with Comatula, is one of the few surviving members of the ancient family of the Crinoids, represented by so many extinct genera in the older formations. Scales of Lepidotus gigas. Agass. a. Aechmodus Leachii and Dapedius monilifer. a. Aechmodus. Restored outline. b.

Calyptorhynchus Banksii, VIG. and HORSF. Leachii xanthonotus, GOULD. Polytelis melanura. Platycercus Baueri, VIG. and HORSF. Barnardi, VIG. and HORSF. Adelaidiae, GOULD. flaveolus, GOULD. Psephotus multicolor. haematonotus, GOULD. Melopsittacus undulatus. Euphema aurantia, GOULD. elegans, GOULD. Pezoporus formosus.

Scales of Aechmodus Leachii. c. The fossil fish, of which there are no less than 117 species known as British, resemble generically those of the Oolite, but differ, according to M. Agassiz, from those of the Cretaceous period. Hybodus reticulatus, Agassiz. Lias, Lyme Regis. a. Part of fin, commonly called Ichthyodorulite. b. Chimaera monstrosa.