An Introduction to the Study of Zoology, Illustrated by the CrayfishAppleton, 1906 - 371 pagini |
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Pagina 6
... shallow waters which they prefer , by means of four pairs of jointed legs ( fig . 1 ) ; but , if alarmed , they swim backwards with rapid jerks , propelled by the strokes of. 6 THE NATURAL HISTORY OF THE COMMON CRAYFISH ,
... shallow waters which they prefer , by means of four pairs of jointed legs ( fig . 1 ) ; but , if alarmed , they swim backwards with rapid jerks , propelled by the strokes of. 6 THE NATURAL HISTORY OF THE COMMON CRAYFISH ,
Pagina 7
... pairs of legs , which are used in walking , there is a pair of limbs of a much more massive character , each of which ends in two claws disposed in such a manner as to constitute a powerful pincer ( fig . 1 ; 10 ) . These claws are the ...
... pairs of legs , which are used in walking , there is a pair of limbs of a much more massive character , each of which ends in two claws disposed in such a manner as to constitute a powerful pincer ( fig . 1 ; 10 ) . These claws are the ...
Pagina 8
... pair of styles ( fig . 3 , B ; 15 ) . Crayfishes do not inhabit every British river , and even where they are known to abound , it is not easy to find them at all times of the year . In granite districts and others , in which the soil ...
... pair of styles ( fig . 3 , B ; 15 ) . Crayfishes do not inhabit every British river , and even where they are known to abound , it is not easy to find them at all times of the year . In granite districts and others , in which the soil ...
Pagina 20
... pairs ( A ; 15 , 16 ) are converted into the peculiar styles which distinguish that sex . The four pairs of legs which are employed for walking purposes , are divided into a number of joints , and the foremost two pairs are terminated ...
... pairs ( A ; 15 , 16 ) are converted into the peculiar styles which distinguish that sex . The four pairs of legs which are employed for walking purposes , are divided into a number of joints , and the foremost two pairs are terminated ...
Pagina 21
... the exception of its basal joint ) and the 5th to the 14th appendages on the animal's right are removed ; the eggs also are shown attached to the swimmerets of the left side of the body . be chelate . The two hindermost pairs , on the. xi.
... the exception of its basal joint ) and the 5th to the 14th appendages on the animal's right are removed ; the eggs also are shown attached to the swimmerets of the left side of the body . be chelate . The two hindermost pairs , on the. xi.
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