An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 22
... parallel with one another , and with the middle line of the body . They are divided into a number of joints , of which one of those near the base THE FOOT - JAWS AND THE JAWS . 23 is 22 THE NATURAL HISTORY OF THE COMMON CRAYFISH.
... parallel with one another , and with the middle line of the body . They are divided into a number of joints , of which one of those near the base THE FOOT - JAWS AND THE JAWS . 23 is 22 THE NATURAL HISTORY OF THE COMMON CRAYFISH.
Pagina 25
... base of the outer foot - jaws , a large flap will be removed . This flap of the carapace is called the branchiostegite ( fig . 1 , bg ) , because it covers the gills or branchia ( fig . 4 ) , which are now exposed . They have the appear ...
... base of the outer foot - jaws , a large flap will be removed . This flap of the carapace is called the branchiostegite ( fig . 1 , bg ) , because it covers the gills or branchia ( fig . 4 ) , which are now exposed . They have the appear ...
Pagina 76
... base of the podo- branchia ; G , hooked seta of the lamina ; ( A - C , x 3 ; D - G , highly magnified ) . b , base of podobranchia ; cs , coxopoditic setæ ; cxp , coxopodite ; 7 , lamina , pl . plume , and st , stem of podobranchia ; t ...
... base of the podo- branchia ; G , hooked seta of the lamina ; ( A - C , x 3 ; D - G , highly magnified ) . b , base of podobranchia ; cs , coxopoditic setæ ; cxp , coxopodite ; 7 , lamina , pl . plume , and st , stem of podobranchia ; t ...
Pagina 77
... base to its summit . Each filament is traversed by large vascular channels , which break up into a net - work immediately beneath the surface . The blood driven into the external canals of the stem ( fig . 15 , av ) is eventually poured ...
... base to its summit . Each filament is traversed by large vascular channels , which break up into a net - work immediately beneath the surface . The blood driven into the external canals of the stem ( fig . 15 , av ) is eventually poured ...
Pagina 77
... base of the podo- branchia ; G , hooked seta of the lamina ; ( A - C , x 3 ; D - G , highly magnified ) . b , base of podobranchia ; cs , coxopoditic setæ ; cxp , coxopodite ; 7 , lamina , pl . plume , and st , stem of podobranchia ; t ...
... base of the podo- branchia ; G , hooked seta of the lamina ; ( A - C , x 3 ; D - G , highly magnified ) . b , base of podobranchia ; cs , coxopoditic setæ ; cxp , coxopodite ; 7 , lamina , pl . plume , and st , stem of podobranchia ; t ...
Termeni și expresii frecvente
abdomen abdominal appendages abdominal somite acid alimentary ambulatory limbs animals antenna antennule aperture appears artery arthrobranchiæ Astacine attached basal joint base become blastomeres blood body branchiæ branchial cavity branchial chamber branchial filaments branchiostegite canal carapace cephalic cephalothorax cervical groove chitinous convex corpuscles coxopodite crayfish Crustacea cuticle cuticular division ecdysis ectoderm ectostracum edge endopodite endosternites epiblast epimeral epipodite exopodite exoskeleton external fact fibres food-yelk forceps front ganglion gastrolith gills gives rise green gland hind-gut hypoblast inner lamina lateral less lobes lobster longitudinal male mandibles maxillipede membrane metameres morphological muscles muscular Nauplius nerve nobilis nucleated cells nuclei organs outer ovum pairs plate pleura podobranchiæ portion posterior present procephalic protopodite region ridge rostrum scaphognathite segments seta setæ side somite species spines stem sternal sternum stomach structure substance surface telson tergal tergum terminal thoracic thoracic limbs thoracic somite tissue transverse wall yelk