An Introduction to the Study of Zoology, Illustrated by the CrayfishAppleton, 1906 - 371 pagini |
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Pagina 9
... appear that crayfishes fall into a state of torpor in the winter , and thus " hybernate " in the strict sense of the word . At any rate , so long as the weather is open , the crayfish lies at the mouth of his burrow , barring the ...
... appear that crayfishes fall into a state of torpor in the winter , and thus " hybernate " in the strict sense of the word . At any rate , so long as the weather is open , the crayfish lies at the mouth of his burrow , barring the ...
Pagina 25
... appear- ance of a number of delicate plumes , which take a direc- tion from the bases of the legs upwards and forwards behind , upwards and backwards in front , their summits converging towards the upper end of the cavity in which they ...
... appear- ance of a number of delicate plumes , which take a direc- tion from the bases of the legs upwards and forwards behind , upwards and backwards in front , their summits converging towards the upper end of the cavity in which they ...
Pagina 32
... appear to reach maturity , so far as the power of reproduction is concerned , in their fifth or , more usually , their sixth year . However , I have seen a female , with eggs attached under the abdomen , only two inches long , and ...
... appear to reach maturity , so far as the power of reproduction is concerned , in their fifth or , more usually , their sixth year . However , I have seen a female , with eggs attached under the abdomen , only two inches long , and ...
Pagina 34
... appears to become distended ; in all probability , in consequence of the commencing retraction of the limbs into the interior of the exoskeleton of the body . In fact , it has been remarked , that if , at this period , the extremity of ...
... appears to become distended ; in all probability , in consequence of the commencing retraction of the limbs into the interior of the exoskeleton of the body . In fact , it has been remarked , that if , at this period , the extremity of ...
Pagina 36
... appears to be quite aware of its helplessness , and governs itself accordingly . An observant naturalist says : " I once had a do- mesticated crayfish ( Astacus fluviatilis ) , which I kept in a glass pan , in water , not more than an ...
... appears to be quite aware of its helplessness , and governs itself accordingly . An observant naturalist says : " I once had a do- mesticated crayfish ( Astacus fluviatilis ) , which I kept in a glass pan , in water , not more than an ...
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