An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 19
... terminal flap , on the under side of which the vent ( fig . 3 , a ) is situated , and which is called the telson ( fig . 2 , t , t ' ) . All these are freely moveable upon one another , inasmuch as the exoskeleton which connects them is ...
... terminal flap , on the under side of which the vent ( fig . 3 , a ) is situated , and which is called the telson ( fig . 2 , t , t ' ) . All these are freely moveable upon one another , inasmuch as the exoskeleton which connects them is ...
Pagina 22
... terminal joints are called the " hand . " We shall escape confusion if we call these limbs the forceps , and restrict the name of chela to the two terminal joints . All the limbs hitherto mentioned subserve locomotion and prehension in ...
... terminal joints are called the " hand . " We shall escape confusion if we call these limbs the forceps , and restrict the name of chela to the two terminal joints . All the limbs hitherto mentioned subserve locomotion and prehension in ...
Pagina 94
... terminal segment ( dp ) turns on two hinges ( x ) , formed by the hard exoskeleton and situated at opposite points of the diameter of the base , on the penultimate segment ; and these hinges are so disposed that the last joint can be ...
... terminal segment ( dp ) turns on two hinges ( x ) , formed by the hard exoskeleton and situated at opposite points of the diameter of the base , on the penultimate segment ; and these hinges are so disposed that the last joint can be ...
Pagina 95
... terminal segment is brought towards that of the fixed claw . A living crayfish is able to perform very varied move . ments with its pincers . When it swims backwards , these limbs are stretched straight out , parallel with one another ...
... terminal segment is brought towards that of the fixed claw . A living crayfish is able to perform very varied move . ments with its pincers . When it swims backwards , these limbs are stretched straight out , parallel with one another ...
Pagina 96
... terminal five - pointed flapper . The rings of the abdomen are articulated together by joints ( fig . 21 , x ) situated a little below the middle of the height of the rings , at opposite ends of transverse lines , at right angles to the ...
... terminal five - pointed flapper . The rings of the abdomen are articulated together by joints ( fig . 21 , x ) situated a little below the middle of the height of the rings , at opposite ends of transverse lines , at right angles to 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