An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 5
... , in almost all points ; but the gills and the abdominal appendages present differences ; and the last thoracic somite is united with the rest in the lobster . ( See Chap . V. ) 66 general hue may be red or blue . These.
... , in almost all points ; but the gills and the abdominal appendages present differences ; and the last thoracic somite is united with the rest in the lobster . ( See Chap . V. ) 66 general hue may be red or blue . These.
Pagina 20
... rest , but can be moved backwards and forwards through a small space ( fig . 3 , B ; xiv ) . Attached to the sternal side of every ring of the abdomen of the female there is a pair of limbs , called swimmerets . In the five anterior ...
... rest , but can be moved backwards and forwards through a small space ( fig . 3 , B ; xiv ) . Attached to the sternal side of every ring of the abdomen of the female there is a pair of limbs , called swimmerets . In the five anterior ...
Pagina 23
... rest , and strongly toothed along the inner edge , or that which is turned towards its fellow . It is obvious that these two limbs are well adapted to crush and tear whatever comes between them , and they are , in fact , jaws or organs ...
... rest , and strongly toothed along the inner edge , or that which is turned towards its fellow . It is obvious that these two limbs are well adapted to crush and tear whatever comes between them , and they are , in fact , jaws or organs ...
Pagina 34
... rests for a while , and then the agitation of the limbs and body recommences . The carapace is forced upwards and forwards by the pro- trusion of the body , and remains attached only in the region of the mouth . The head is next drawn ...
... rests for a while , and then the agitation of the limbs and body recommences . The carapace is forced upwards and forwards by the pro- trusion of the body , and remains attached only in the region of the mouth . The head is next drawn ...
Pagina 35
... rest , that , except for the brighter colour of the latter , the two cannot be distinguished . After exuviation , the owner of the cast skin , ex- hausted by its violent struggles , which are not unfre- quently fatal , lies in a ...
... rest , that , except for the brighter colour of the latter , the two cannot be distinguished . After exuviation , the owner of the cast skin , ex- hausted by its violent struggles , which are not unfre- quently fatal , lies in a ...
Termeni și expresii frecvente
abdominal appendages abdominal somite ambulatory limbs animals antenna antennule aperture appears artery arthrobranchiæ Astacina Astacine Astacus fluviatilis Astacus torrentium attached basal joint base blood body branchiæ branchial cavity branchial chamber branchial filaments branchiostegite canal carapace cavity cephalothorax cervical groove chelate chitinous convex corpuscles coxopodite Crustacea cuticle cuticular developed distinct division ecdysis edge endopodite endosternites English crayfish epiblast epimera epipodite exopodite exoskeleton external eye-stalks fact fibres forceps front gastrolith gastrula genus gills gives rise green gland hind-gut inner lamina latter leptodactylus less lobster male mandible maxillipede metameres modified morphological muscles Nauplius nerve nobilis noble crayfish nucleated cells organs outer ovum pairs Penæus plate pleura pleurobranchiæ podo podobranchiæ portion posterior Potamobiida prawns present procephalic protopodite region ridge rostrum scaphognathite seta setæ side somite species spines sternal sternum stomach structure substance surface telson tergal tergum terminal thoracic thoracic limbs thoracic somite tissue transverse wall