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abdomen adult Allman anal animals antennae aperture appendages aquatic Ascidians attached belong birds body bones bony branchise calcareous carapace cavity cells Cetacea character ciliated Claus claws coenosarc composed Corallum Crustacea Ctenophora developed dilated Diptera disk divided dorsal eggs elytra embryo external extinct eyes families feet female fishes four furnished genera gills gonophore Hackel head Hemiptera hind horny Huxley Hydrozoa incisors includes Infusoria insects intestine joint known labium larva larval form larvse latter limbs living lobes males mammals mandibles Maxillary palpi membrane metamorphosis Mollusca mouth movable muscles Notochord ocelli organs oviparous ovipositor parasitic peculiar placed placenta plates polypite Polyzoa posterior proboscis Protozoa pupa reproduction Respiration respiratory rudimentary scales Schmarda segments Sexes distinct shell skeleton skin sometimes species Sponges stage sternum Subclass suborder suckers suctorial tail teeth tentacles thorax toes tube upper ventral vertebrae Vertebrata vulgaris wings worms young zooids
Page 292 - I should premise that I use the term Struggle for Existence in a large and metaphorical sense, including dependence of one being on another, and including (which is more important) not only the life of the individual, but success in leaving progeny.
Page 282 - Although geological research has undoubtedly revealed the former existence of many links, bringing numerous forms of life much closer together, it does not yield the infinitely many fine gradations between past and present species required on the theory, and this is the most obvious of the many objections which may be urged against it.
Page 278 - is a definite combination of heterogeneous changes, both simultaneous and successive, in correspondence with external coexistences and sequences.
Page 278 - Life is a series of definite and successive changes, both of structure and composition, which take place within an individual without destroying its identity.
Page 209 - Cynodrakon), many of them represented by more than one species, all carnivorous, and presenting more or less mammalian analogies, for which he proposes to form a distinct order under the name of Theriodontia, — having the dentition of carnivorous type ; the incisors defined by position, and divided from the molars...
Page 270 - Embryology rises greatly in interest, when we look at the embryo as a picture, more or less obscured, of the progenitor, either in its adult or larval state, of all the members .of the same great class.
Page 212 - He says that, with very few exceptions, it is the rule that, when both sexes are of strikingly gay and conspicuous colors, the nest is such as to conceal the sitting bird ; while, whenever there is a striking contrast of colors, the male being gay and conspicuous, the female dull and obscure, the nest is open and the sitting bird exposed to view.
Page 282 - Natural Selection utterly fails to account for the conservation and development of the minute and rudimentary beginnings, the slight and infinitesimal commencements of structures, however useful those structures may afterward become.