An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina xii
... 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 LIST OF WOODCUTS .
... 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 LIST OF WOODCUTS .
Pagina 20
... segments , as there are pairs of legs ( fig . 3 ) ; and , moreover , the hindermost of these segments is not firmly united with the rest , but can be moved backwards and forwards through a small space ( fig . 3 , B ; xiv ) . Attached to ...
... segments , as there are pairs of legs ( fig . 3 ) ; and , moreover , the hindermost of these segments is not firmly united with the rest , but can be moved backwards and forwards through a small space ( fig . 3 , B ; xiv ) . Attached to ...
Pagina 94
... 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 moved only ...
... 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 moved only ...
Pagina 95
... segments ; and each of these is articulated with the segments on each side of it by a hinge of just the same character as that which connects the moveable claw of the chela with the penultimate segment , while the basal segment is ...
... segments ; and each of these is articulated with the segments on each side of it by a hinge of just the same character as that which connects the moveable claw of the chela with the penultimate segment , while the basal segment is ...
Pagina 96
... segments are successively either extended or flexed , the chela describes a very complicated curve ; and by varying the extent of flexion or extension of each segment , this curve is susceptible of endless varia- tion . It would ...
... segments are successively either extended or flexed , the chela describes a very complicated curve ; and by varying the extent of flexion or extension of each segment , this curve is susceptible of endless varia- tion . It would ...
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