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allied ambulacral animal aperture appear arms autopores basals beaks belong body Brachiopods calcareous calyx Cambrian canal Carboniferous rocks Chalk characteristic chitinous columella commonly composed comprises corallites corallum corals Cretaceous Cretaceous rocks Crinoids Crustaceans deposits developed Devonian Devonian rocks disc dorsal valve enlarged Eocene existing external family the shell Foraminifera fossil fossil forms Gastropods genera genus geological Graptolites grooves horny included Jurassic known Lastly lateral layer less ligament Limestone lobes margin Miocene mouth operculum Ordovician Ordovician rocks organisms outer lip pair Palaeozoic pallial line perforated period Permian placed plates Pliocene Polyzoa polyzoary pores possess posterior present day radial recent regarded represented resembles rows segments septa septum shell fig showing side Silurian siphuncle skeleton sometimes species spicules spines spiral spire Sponges striated structure surface sutures tabulae teeth Tertiary thin transverse Trias tubes types underbasals Upper usually ventral valve vertical visceral chamber wall whorls Zittel
Page iii - NICHOLSON. A Manual of Zoology, for the Use of Students. With a General Introduction on the Principles of Zoology. By HENRY ALLEYNE NICHOLSON, MD, D.Sc., FLS, FGS, Regius Professor of Natural History in the University of Aberdeen.
Page 136 - The nummulitic formation, with its characteristic fossils, plays a far more conspicuous part than any other tertiary group in the solid framework of the earth's crust, whether in Europe, Asia, or Africa. It often attains a thickness of many thousand feet, and extends from the Alps to the Carpathians, and is in full force in the north of Africa, as, for example, in Algeria and Morocco. It has...
Page 136 - Egypt, where it was largely quarried of old for the building of the Pyramids, into Asia Minor, and across Persia by Bagdad to the mouths of the Indus. It occurs not only in Cutch, but in the mountain ranges which separate Scinde from Persia, and which form the passes leading to Caboul ; and it has been followed still farther eastward into India, as far as eastern Bengal and the frontiers of China.
Page 98 - Wallace, in which he concludes, that " every species has come into existence coincident both in space and time with a pre-existing closely allied species.
Page 136 - It often attains a thickness of many thousand feet, and extends from the Alps to the Carpathians, and is in full force in the north of Africa, as, for example, in Algeria and Morocco. It has been traced from Egypt — where it was largely quarried of old for the building of the pyramids — into Asia Minor, and across Persia, by Bagdad, to the mouth of the Indus.
Page 189 - Inst., vol. x. 35. 1886. Second Contribution to the Studies on the Cambrian Faunas of North America.
Page 60 - ... summit were deposited with comparative rapidity. Upon this view, a formation like the Lias is one formed by a process of very slow and intermittent sedimentation, the life-zones being separated by intervals during which sedimentation must have been at a standstill, but which were long enough to allow more or less considerable biological changes, some forms dying out or becoming modified while other new ones came in. Upon this view, further, a formation like...
Page 122 - rotaliform " — ie, coiled in such a manner that the whole of the segments are visible on the upper surface, those of the last convolution only on the inferior or apertural side, sometimes one face being more convex, sometimes the other. Aberrant forms evolute, outspread, acervuline or irregular. Some of the...
Page 360 - On the Structure and Affinities of the Genus Monticulipora and its Sub-Genera, with Critical Descriptions of Illustrative Species. Illustrated with numerous Engravings on wood and lithographed Plates. Super-royal 8vo, 18s.