An Introduction to the Study of Zoology, Illustrated by the CrayfishAppleton, 1906 - 371 pagini |
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Pagina xii
... SEGMENT OF THE ENDOPHRAGMAL • SYSTEM LONGITUDINAL SECTION OF CEPHALO- 159 43 . " 99 " 9 THORAX . • • 162 44 . 99 99 " THE THIRD MAXILLIPEDE . · 164 FIG . 45. Astacus fluviatilis . THE FIRST AND SECOND xii LIST OF WOODCUTS .
... SEGMENT OF THE ENDOPHRAGMAL • SYSTEM LONGITUDINAL SECTION OF CEPHALO- 159 43 . " 99 " 9 THORAX . • • 162 44 . 99 99 " THE THIRD MAXILLIPEDE . · 164 FIG . 45. Astacus fluviatilis . THE FIRST AND SECOND 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 jcint 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 jcint 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 ...
Alte ediții - Afișează-le pe toate
An Introduction to the Study of Zoology, Illustrated by the Crayfish Thomas Henry Huxley Vizualizare completă - 1895 |
An Introduction to the Study of Zoology, Illustrated by the Crayfish Thomas Henry Huxley Vizualizare completă - 1902 |
Termeni și expresii frecvente
abdomen abdominal appendages abdominal somites ambulatory limbs Amurland animals antenna antennule aperture appears artery arthrobranchiæ Astacine Astacus fluviatilis Astacus torrentium attached basal joint blastomeres blood body branchiæ branchial cavity carapace cardiac cavity cephalothorax cervical groove chelate chitinous corpuscles coxopodite cray Crustacea cuticle cuticular division ecdysis Écrevisses edge endopodite English crayfish epiblast epipodite exopodite exoskeleton eye-stalk fact female filaments fluviatilis.-A forceps front ganglia ganglion gastrolith gills give rise green gland hind-gut hinder hypoblast Illustrations inner integument lateral leptodactylus less lobster longitudinal male mid-gut middle modified morphological muscle muscular nerve fibres nobilis noble crayfish nucleated cells nuclei organs ossicle outer pairs plate pleura podobranchiæ portion posterior prawns present region ridge rostrum segments septal lines setæ side somite species spermatozoa spines sternal sternum stomach structure substance surface swimmerets telson tergal tergum terminal thoracic thoracic limbs thoracic somite tissue transverse wall yelk zone