An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 19
... joints will have to be attentively considered by - and - by ; it is sufficient , at present , to remark that , wherever a joint exists , it is produced in the same fashion , by the exo- skeleton remaining soft in certain regions of the ...
... joints will have to be attentively considered by - and - by ; it is sufficient , at present , to remark that , wherever a joint exists , it is produced in the same fashion , by the exo- skeleton remaining soft in certain regions of the ...
Pagina 20
... divided into a number of joints , and the foremost two pairs are terminated by double claws , arranged so as to form a pincer , whence they are said to 10 A 4 8 lb B 4 mt X XT 20 THE NATURAL HISTORY OF THE COMMON CRAYFISH .
... divided into a number of joints , and the foremost two pairs are terminated by double claws , arranged so as to form a pincer , whence they are said to 10 A 4 8 lb B 4 mt X XT 20 THE NATURAL HISTORY OF THE COMMON CRAYFISH .
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.
... 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.
Pagina 22
... joints are called the " hand . " We shall escape confusion if we call these limbs the forceps , and restrict the name of chela to the two terminal joints . All the limbs hitherto mentioned subserve locomotion and prehension in various ...
... joints are called the " hand . " We shall escape confusion if we call these limbs the forceps , and restrict the name of chela to the two terminal joints . All the limbs hitherto mentioned subserve locomotion and prehension in various ...
Pagina 34
... joint . The soft membranous part of the exo- skeleton , which connects the hinder end of the carapace with the first ring of the abdomen , gives way , and the body , covered with the new soft integument , protrudes ; its dark brown ...
... joint . The soft membranous part of the exo- skeleton , which connects the hinder end of the carapace with the first ring of the abdomen , gives way , and the body , covered with the new soft integument , protrudes ; its dark brown ...
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