An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 18
... branchial cavities ; cg , cervical groove ; these letters are placed on the carapace ; r , rostrum ; t , t ' , the two divisions of the telson ; 1 , eye - stalks ; 2 , antennules ; 3 , antennæ ; 20 , lateral lobes of tail - fin ; XV ...
... branchial cavities ; cg , cervical groove ; these letters are placed on the carapace ; r , rostrum ; t , t ' , the two divisions of the telson ; 1 , eye - stalks ; 2 , antennules ; 3 , antennæ ; 20 , lateral lobes of tail - fin ; XV ...
Pagina 24
... abdo- men , which are partly overlapped by , and partly overlap , that margin . If the blade of a pair of scissors is care . THE BRANCHIAL CHAMBER AND THE GILLS . 25 fully introduced 24 THE NATURAL HISTORY OF THE COMMON CRAYFISH .
... abdo- men , which are partly overlapped by , and partly overlap , that margin . If the blade of a pair of scissors is care . THE BRANCHIAL CHAMBER AND THE GILLS . 25 fully introduced 24 THE NATURAL HISTORY OF THE COMMON CRAYFISH .
Pagina 25
... branchial chamber . These branchise are the respiratory organs ; and they perform the same functions as the gills of a fish , to which they present some similarity . If the gills are cleared away , it is seen that the branchial cavity ...
... branchial chamber . These branchise are the respiratory organs ; and they perform the same functions as the gills of a fish , to which they present some similarity . If the gills are cleared away , it is seen that the branchial cavity ...
Pagina 27
... branchial chamber is open behind , below , and in front ; and , therefore , that the water in which the crayfish habitually lives has free ingress and egress . Thus the air dissolved in the water enables breathing to go on , just as it ...
... branchial chamber is open behind , below , and in front ; and , therefore , that the water in which the crayfish habitually lives has free ingress and egress . Thus the air dissolved in the water enables breathing to go on , just as it ...
Pagina 69
... branchial chamber to a cavity situated in the dorsal region of the thorax , termed the pericardium ( p ) , into which they open . The blood of the crayfish is kept in a state of con- stant circulating motion by a pumping and ...
... branchial chamber to a cavity situated in the dorsal region of the thorax , termed the pericardium ( p ) , into which they open . The blood of the crayfish is kept in a state of con- stant circulating motion by a pumping and ...
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