An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 17
... internal skeleton ; that of the crayfish is termed an exoskeleton , or external skeleton . It is from the circumstance that the body of the crayfishes is enveloped in this hard crust , that the name of Crustacea is applied to them ...
... internal skeleton ; that of the crayfish is termed an exoskeleton , or external skeleton . It is from the circumstance that the body of the crayfishes is enveloped in this hard crust , that the name of Crustacea is applied to them ...
Pagina 17
... internal skeleton ; that of the crayfish is termed an exoskeleton , or external skeleton . It is from the circumstance that the body of the crayfishes is enveloped in this hard crust , that the name of Crustacea is applied to them ...
... internal skeleton ; that of the crayfish is termed an exoskeleton , or external skeleton . It is from the circumstance that the body of the crayfishes is enveloped in this hard crust , that the name of Crustacea is applied to them ...
Pagina 27
... internal structure of the crayfish , there are some points which cannot escape notice , how- ever rough the process of examination may be . Thus , when the carapace is removed in a crayfish which has been just killed , the heart is seen ...
... internal structure of the crayfish , there are some points which cannot escape notice , how- ever rough the process of examination may be . Thus , when the carapace is removed in a crayfish which has been just killed , the heart is seen ...
Pagina 31
... internal structures , the most noticeable are the large masses of flesh , or muscle , in the thorax and abdomen , and in the pincers ; which , instead of being red , as in most of the higher animals , is white . It will further be ...
... internal structures , the most noticeable are the large masses of flesh , or muscle , in the thorax and abdomen , and in the pincers ; which , instead of being red , as in most of the higher animals , is white . It will further be ...
Pagina 35
... back into position , and it must be some time before the pressure of the internal fluids is so distributed as to stretch them out . When the process of exuviation has proceeded so far that the carapace is raised , nothing stops the ...
... back into position , and it must be some time before the pressure of the internal fluids is so distributed as to stretch them out . When the process of exuviation has proceeded so far that the carapace is raised , nothing stops the ...
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