File:A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) (1907) (14592789328).jpg

Identifier: guidetofossilinv00brit (find matches)
Title: A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history)
Year: 1907 (1900s)
Authors: British Museum (Natural History). Dept. of Geology Bather, Francis Arthur, 1863-
Subjects: Fossils
Publisher: London, Printed by order of the Trustees
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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ass, the Cephalopoda (Head-feet). The meaning of this name is obvious to any one consideringsuch well-known living examples of these marine molluscsas the octopus, tlie cuttle-fish, the squid, and the nautilus(Fig. 78), in all of which the mouth is encircled by arms ortentacles, the altered representatives of part of the molluscanfoot. Just behind these are the two eyes. The hind-part ofthe body consists of a rounded or sometimes elongate sackcontaining the viscera and called the visceral hump. Part MOLLUSCA— CEPHALOPODA. 145 of the skin forms a mantle-fold on the under surface and Gallery-encloses the gills. In front of the gills another part of thefoot is folded together to form a funnel through which thewater that has passed into the gill-chamber can be forciblysquirted out. By this means the animal can be drivenbackwards through the water (Fig. 87). The mouth is armedwith strong horny jaws, shaped like a parrots beak (Fig.78 a-c). The power of locomotion the concentration of the
Text Appearing After Image:
Fig. 78.—Cephalopoda, a, b, c, Rhyncholiths, fossil beaks of a nautilusfrom the Miocene of Malta; nat. size; d, the Pearly Nautilus in itsshell, part of which has been cut away so as to show the chambersand the siphuncle running through them. On the animal are seenthe visceral hump (a), the muscle and ring of attachment (g), theeye (s), the funnel (k), the tentacles (j>), and the hood (n). e and /,the squid, Loligo; the shell (e) is seen from the back, the animal (/)from the under side ; d, e, f, are much less than natural size. chief organs in the forepart of the body, and the strong jaws,show that these animals can prey upon others, even on thosewith hard coverings, and lead one to regard them as morehighly developed than the other MoUusca. All these features Betweencan be recognised in the exhibited specimens and models of ^all^easesliving cephalopods. Further study of these specimens will Table-easeshow certain differences between the forms that have been l.mentioned. Thus th

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