An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 7
... limbs of a much more massive character , each of which ends in two claws disposed in such a manner as to constitute a powerful pincer ( fig . 1 ; 10 ) . These claws are the chief weapons of offence and defence of the crayfish , and ...
... limbs of a much more massive character , each of which ends in two claws disposed in such a manner as to constitute a powerful pincer ( fig . 1 ; 10 ) . These claws are the chief weapons of offence and defence of the crayfish , and ...
Pagina 7
... limbs of a much more massive character , each of which ends in two claws disposed in such a manner as to constitute a powerful a powerful pincer ( fig . 1 ; 10 ) . These claws are the chief weapons of offence and defence of the crayfish ...
... limbs of a much more massive character , each of which ends in two claws disposed in such a manner as to constitute a powerful a powerful pincer ( fig . 1 ; 10 ) . These claws are the chief weapons of offence and defence of the crayfish ...
Pagina 20
... limbs , called swimmerets . In the five anterior rings , these are small and slender ( fig . 3 , B ; 15 , 19 ) ; but those of the sixth ring are very large , and each ends in two broad plates ( 20 ) . These two plates on each side ...
... limbs , called swimmerets . In the five anterior rings , these are small and slender ( fig . 3 , B ; 15 , 19 ) ; but those of the sixth ring are very large , and each ends in two broad plates ( 20 ) . These two plates on each side ...
Pagina 22
... limbs ( 10 ) , which are chelate , like those which im- mediately follow them , but vastly larger . They often ... limbs the forceps , and restrict the name of chela to the two terminal joints . All the limbs hitherto mentioned subserve ...
... limbs ( 10 ) , which are chelate , like those which im- mediately follow them , but vastly larger . They often ... limbs the forceps , and restrict the name of chela to the two terminal joints . All the limbs hitherto mentioned subserve ...
Pagina 23
... limbs are well adapted to crush and tear whatever comes between them , and they are , in fact , jaws or organs of manducation . At the same time , it will be noticed that they retain a curiously close general resemblance to the hinder ...
... limbs are well adapted to crush and tear whatever comes between them , and they are , in fact , jaws or organs of manducation . At the same time , it will be noticed that they retain a curiously close general resemblance to the hinder ...
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