An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 146
... spines , of which two , at the outer end of the series , are larger than the rest . The second somite is longer than the first ( fig . 1 ) ; it has very broad pleura , while those of the first somite are small and hidden by the ...
... spines , of which two , at the outer end of the series , are larger than the rest . The second somite is longer than the first ( fig . 1 ) ; it has very broad pleura , while those of the first somite are small and hidden by the ...
Pagina 147
... spines , of which two , at the outer end of the series , are larger than the rest . The second somite is longer than the first ( fig . 1 ) ; it has very broad pleura , while those of the first somite are small and hidden by the ...
... spines , of which two , at the outer end of the series , are larger than the rest . The second somite is longer than the first ( fig . 1 ) ; it has very broad pleura , while those of the first somite are small and hidden by the ...
Pagina 157
... spines , which descend , in front of the ophthalmic somite , towards the conical tubercle mentioned above : it thus gives rise to an imperfect partition between the orbits . FIG . 41. - Astacus fluviatilis . — The rostrum , seen from ...
... spines , which descend , in front of the ophthalmic somite , towards the conical tubercle mentioned above : it thus gives rise to an imperfect partition between the orbits . FIG . 41. - Astacus fluviatilis . — The rostrum , seen from ...
Pagina 161
... spines , which descend , in front of the ophthalmic somite , towards the conical tubercle mentioned above : it thus gives rise to an imperfect partition between the orbits . FIG . 41.— Astacus fluviatilis . — The rostrum , seen from the ...
... spines , which descend , in front of the ophthalmic somite , towards the conical tubercle mentioned above : it thus gives rise to an imperfect partition between the orbits . FIG . 41.— Astacus fluviatilis . — The rostrum , seen from the ...
Pagina 197
... spines . As these processes , though so similar to hairs in general appearance , are essentially different from the structures known as hairs in the higher animals , it is better to speak of them as setæ . These setæ ( fig . 56 , F ) ...
... spines . As these processes , though so similar to hairs in general appearance , are essentially different from the structures known as hairs in the higher animals , it is better to speak of them as setæ . These setæ ( fig . 56 , F ) ...
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