An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina xii
... ROSTRUM • • 157 42 . A SEGMENT OF THE ENDOPHRAGMAL 99 " " 99 SYSTEM 159 • 43 . " " 99 44 . 99 99 " ་ LONGITUDINAL SECTION OF CEPHALO- THORAX . THE THIRD MAXILLIPEDE . · 162 164 LIST OF WOODCUTS . xiii FIG . 45. Astacus fluviatilis xii ...
... ROSTRUM • • 157 42 . A SEGMENT OF THE ENDOPHRAGMAL 99 " " 99 SYSTEM 159 • 43 . " " 99 44 . 99 99 " ་ LONGITUDINAL SECTION OF CEPHALO- THORAX . THE THIRD MAXILLIPEDE . · 162 164 LIST OF WOODCUTS . xiii FIG . 45. Astacus fluviatilis xii ...
Pagina 6
... rostrum ; t , telson.- 1 , eye - stalk ; 2 , antennule ; 3 , antenna ; 9 , external maxillipede ; 10 , forceps ; 14 , last ambulatory leg ; 17 , third abdominal ap- pendage ; 20 , lateral lobe of the tail - fin , or sixth abdominal ...
... rostrum ; t , telson.- 1 , eye - stalk ; 2 , antennule ; 3 , antenna ; 9 , external maxillipede ; 10 , forceps ; 14 , last ambulatory leg ; 17 , third abdominal ap- pendage ; 20 , lateral lobe of the tail - fin , or sixth abdominal ...
Pagina 7
... rostrum ; t , telson.— 1 , eye - stalk ; 2 , antennule ; 3 , antenna ; 9 , external maxillipede ; 10 , forceps ; 14 , last ambulatory leg ; 17 , third abdominal ap- pendage ; 20 , lateral lobe of the tail - fin , or sixth abdominal ...
... rostrum ; t , telson.— 1 , eye - stalk ; 2 , antennule ; 3 , antenna ; 9 , external maxillipede ; 10 , forceps ; 14 , last ambulatory leg ; 17 , third abdominal ap- pendage ; 20 , lateral lobe of the tail - fin , or sixth abdominal ...
Pagina 7
... rostrum ; t , telson.- 1 , eye - stalk ; 2 , antennule ; 3 , antenna ; 9 , external maxillipede ; 10 , forceps ; 14 , last ambulatory leg ; 17 , third abdominal ap- pendage ; 20 , lateral lobe of the tail - fin , or sixth abdominal ...
... rostrum ; t , telson.- 1 , eye - stalk ; 2 , antennule ; 3 , antenna ; 9 , external maxillipede ; 10 , forceps ; 14 , last ambulatory leg ; 17 , third abdominal ap- pendage ; 20 , lateral lobe of the tail - fin , or sixth abdominal ...
Pagina 18
... 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.
... 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.
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