A History of Crustacea: Recent MalacostracaD. Appleton, 1893 - 466 pagini |
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Pagina 32
... segment , is considered by others not to be a true twenty - first segment , but a median outgrowth of the twentieth . Scarcely ever can the whole number be dis- tinguished in one and the same animal . As the Entomos- traca always have ...
... segment , is considered by others not to be a true twenty - first segment , but a median outgrowth of the twentieth . Scarcely ever can the whole number be dis- tinguished in one and the same animal . As the Entomos- traca always have ...
Pagina 33
... segment is limited to a single pair of appendages . Segments which are not independent in one of the families will be found well articulated in another , and those which can least boast of freedom nevertheless frequently point to an ...
... segment is limited to a single pair of appendages . Segments which are not independent in one of the families will be found well articulated in another , and those which can least boast of freedom nevertheless frequently point to an ...
Pagina 34
... segment should be studied , in some form the less abnormal the better . 1. The first segment is known as the ocular or ophth- almic . This is clearly articulated in the Squillidæ , but only occasionally in other groups , as in the ...
... segment should be studied , in some form the less abnormal the better . 1. The first segment is known as the ocular or ophth- almic . This is clearly articulated in the Squillidæ , but only occasionally in other groups , as in the ...
Pagina 38
... segment carries the outer , under , or second antennæ , sometimes called simply the antennæ in distinc- tion from ' antennules . ' They are rarely absent , as in the females of some Amphipoda . More often they are strongly developed ...
... segment carries the outer , under , or second antennæ , sometimes called simply the antennæ in distinc- tion from ' antennules . ' They are rarely absent , as in the females of some Amphipoda . More often they are strongly developed ...
Pagina 39
... segment is of great im- portance , since from this , or from it in conjunction with the preceding segment , the carapace is developed . Its appendages also , the mandibles , yield in value to very few of the other organs . In form they ...
... segment is of great im- portance , since from this , or from it in conjunction with the preceding segment , the carapace is developed . Its appendages also , the mandibles , yield in value to very few of the other organs . In form they ...
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Termeni și expresii frecvente
adult Amphipoda animal Anomura apex appendages basal joint Beddard belong Brachyura branchiæ branchial branchial cavity Budde-Lund burrow carapace character chelate chelipeds claws crab Crustacea Cumacea Dana depth described developed distinct distinguished dorsal epipod exopod eye-stalks eyes Fabricius fathoms female fifth joint fifth pair flagella flagellum fourth joint Fritz Müller front genera genus Giard and Bonnier gnathopods Haan Herbst inch inner branch Isopoda Kröyer larvæ larval last pair Latreille Leach limbs Linn Macrura Malacostraca male mandibles margin maxillæ Mediterranean Miers Milne-Edwards Mysis narrow outer branch pair of legs pair of trunk-legs pairs of pleopods palp parasitic peduncle peræon peræopods plates pleon pleopods regions Risso rostrum rudimentary S. I. Smith Sars second antennæ second joint second maxillipeds setæ short side sixth segment slender specimens Spence Bate spines Stimpson sub-order telson terminal joint third maxillipeds three pairs three-jointed tribe trunk two-jointed type species uropods ventral
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Pagina 157 - I think this is as curious a case of instinct as ever I heard of, and likewise of adaptation in structure between two objects apparently so remote from each other in the scheme of nature, as a crab and a cocoa-nut tree.
Pagina i - Correspondent of the Institute. With 148 Illustrations. $1.75. 46. THE ORGANS OF SPEECH AND THEIR APPLICATION IN THE FORMATION OF ARTICULATE SOUNDS. By GH VON MBYER, Professor in Ordinary of Anatomy at the University of Zurich.
Pagina ii - THE SENSES, INSTINCTS, AND INTELLIGENCE OF ANIMALS, WITH SPECIAL REFERENCE TO INSECTS. By Sir JOHN LUBBOCK.