An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina xii
... ABDOMEN 99 " " " " 38 . CONNECTION BETWEEN THORAX AND " " ABDOMEN 151 · 86 39 . " 9 99 CEPHALOTHORACIC STERNA AND EN- DOPHRAGMAL SYSTEM • · 153 9 59 40 . " " OPHTHALMIC AND ANTENNULARY SO- MITES . • · 156 41 . " " 99 THE ROSTRUM • • 157 ...
... ABDOMEN 99 " " " " 38 . CONNECTION BETWEEN THORAX AND " " ABDOMEN 151 · 86 39 . " 9 99 CEPHALOTHORACIC STERNA AND EN- DOPHRAGMAL SYSTEM • · 153 9 59 40 . " " OPHTHALMIC AND ANTENNULARY SO- MITES . • · 156 41 . " " 99 THE ROSTRUM • • 157 ...
Pagina 18
... , rostrum ; t , t ' , the two divisions of the telson ; 1 , eye - stalks ; 2 , antennules ; 3 , antennæ ; 20 , lateral lobes of tail - fin ; XV - XX , somites of the abdomen . THE EXOSKELETON . 19 is a firm and solid front.
... , rostrum ; t , t ' , the two divisions of the telson ; 1 , eye - stalks ; 2 , antennules ; 3 , antennæ ; 20 , lateral lobes of tail - fin ; XV - XX , somites of the abdomen . THE EXOSKELETON . 19 is a firm and solid front.
Pagina 19
... abdomen . Now the exoskeleton is not of the same constitution throughout these regions . The abdomen , for example , is composed of six complete hard rings ( fig . 2 , xv − xx ) , and a terminal flap , on the under side of which the ...
... abdomen . Now the exoskeleton is not of the same constitution throughout these regions . The abdomen , for example , is composed of six complete hard rings ( fig . 2 , xv − xx ) , and a terminal flap , on the under side of which the ...
Pagina 20
... abdomen of the female there is a pair of limbs , called swimmerets . In the five anterior rings , these are small and slender ( fig . 3 , B ; 15 , 19 ) ; but those of the sixth ring are very large , and each ends in two broad plates ...
... abdomen of the female there is a pair of limbs , called swimmerets . In the five anterior rings , these are small and slender ( fig . 3 , B ; 15 , 19 ) ; but those of the sixth ring are very large , and each ends in two broad plates ...
Pagina 22
... abdomen , and the hinder pairs of ab- dominal limbs ; walks by means of the four hinder pairs of thoracic limbs ; lays hold of anything to fix itself , or to assist in climbing , by the two chelate anterior pairs of these limbs , which ...
... abdomen , and the hinder pairs of ab- dominal limbs ; walks by means of the four hinder pairs of thoracic limbs ; lays hold of anything to fix itself , or to assist in climbing , by the two chelate anterior pairs of these limbs , which ...
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