An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 18
... 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 - XX , somites of the abdomen . THE EXOSKELETON . 19 is a firm and solid front.
... 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 - XX , somites of the abdomen . THE EXOSKELETON . 19 is a firm and solid front.
Pagina 19
... carapace ; and a jointed hind part , commonly termed the tail ( fig . 2 ) . From the perception of a partially real , and partially fanciful , analogy with the regions into which the body is divided in the higher animals , the fore part ...
... carapace ; and a jointed hind part , commonly termed the tail ( fig . 2 ) . From the perception of a partially real , and partially fanciful , analogy with the regions into which the body is divided in the higher animals , the fore part ...
Pagina 24
... carapace . The reason of this is not far to seek . The lower edges of that part of the carapace which belongs to the thorax approach the bases of the legs pretty closely , but a cleft - like space is left ; and this cleft extends ...
... carapace . The reason of this is not far to seek . The lower edges of that part of the carapace which belongs to the thorax approach the bases of the legs pretty closely , but a cleft - like space is left ; and this cleft extends ...
Pagina 25
... carapace is called the branchiostegite ( fig . 1 , bg ) , because it covers the gills or branchia ( fig . 4 ) , which are now exposed . They have the appear- ance of a number of delicate plumes , which take a direc- tion from the bases ...
... carapace is called the branchiostegite ( fig . 1 , bg ) , because it covers the gills or branchia ( fig . 4 ) , which are now exposed . They have the appear- ance of a number of delicate plumes , which take a direc- tion from the bases ...
Pagina 27
... carapace is removed in a crayfish which has been just killed , the heart is seen still pulsating . It is an organ of considerable relative size ( fig . 5 , h ) , which is situated immediately beneath the 99 amm aa cs ሀበ pg Ir t aa h.
... carapace is removed in a crayfish which has been just killed , the heart is seen still pulsating . It is an organ of considerable relative size ( fig . 5 , h ) , which is situated immediately beneath the 99 amm aa cs ሀበ pg Ir t aa h.
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