An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 8
... the waters are liable to freeze , the burrows are deeper and further from the surface than otherwise . Where the soil , through THE FOOD OF THE CRAYFISH . which a stream haunted 8 THE NATURAL HISTORY OF THE COMMON CRAYFISH .
... the waters are liable to freeze , the burrows are deeper and further from the surface than otherwise . Where the soil , through THE FOOD OF THE CRAYFISH . which a stream haunted 8 THE NATURAL HISTORY OF THE COMMON CRAYFISH .
Pagina 17
... surface of things , would find to notice in the animal itself . Probably the most conspicuous peculiarity of the cray- fish , to any one who is familiar only with the higher animals , is the fact that the hard parts of the body are ...
... surface of things , would find to notice in the animal itself . Probably the most conspicuous peculiarity of the cray- fish , to any one who is familiar only with the higher animals , is the fact that the hard parts of the body are ...
Pagina 17
... surface of things , would find to notice in the animal itself . Probably the most conspicuous peculiarity of the cray- fish , to any one who is familiar only with the higher animals , is the fact that the hard parts of the body are ...
... surface of things , would find to notice in the animal itself . Probably the most conspicuous peculiarity of the cray- fish , to any one who is familiar only with the higher animals , is the fact that the hard parts of the body are ...
Pagina 20
... surface is examined carefully , it will be found to be divided into as many transverse bands , or segments , as there are pairs of legs ( fig . 3 ) ; and , moreover , the hindermost of these segments is not firmly united with the rest ...
... surface is examined carefully , it will be found to be divided into as many transverse bands , or segments , as there are pairs of legs ( fig . 3 ) ; and , moreover , the hindermost of these segments is not firmly united with the rest ...
Pagina 33
... surface of the true integument . The cuticular skeleton of the crayfish , in fact , is not even so much a part of the skin as the cast of a snake , or as our own nails . For these are composed of coherent , formed parts of the epidermis ...
... surface of the true integument . The cuticular skeleton of the crayfish , in fact , is not even so much a part of the skin as the cast of a snake , or as our own nails . For these are composed of coherent , formed parts of the epidermis ...
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