An Introduction to the study of zoology, illustrated by the crayfishD. Appleton, 1901 - 371 pagini |
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Pagina 66
... cells , which are particles of simple living matter , or protoplasm , in the midst of each of which is a rounded body , which is termed the nucleus . It is these cells which are the seat of the manufacturing process which results in the ...
... cells , which are particles of simple living matter , or protoplasm , in the midst of each of which is a rounded body , which is termed the nucleus . It is these cells which are the seat of the manufacturing process which results in the ...
Pagina 67
... cells , at the summit of the cæca , these are either absent , or very small , whence the part appears colourless . But , lower down , small yellow granules appear in the cells , and these become bigger and more numerous in the middle ...
... cells , at the summit of the cæca , these are either absent , or very small , whence the part appears colourless . But , lower down , small yellow granules appear in the cells , and these become bigger and more numerous in the middle ...
Pagina 102
... of which is the sudden alteration of form which we call muscular contraction . If we follow the course of the motor nerves in a NERVE FIBRES AND NERVE CELLS . 103 direction away from. 102 THE PHYSIOLOGY OF THE COMMON CRAYFISH .
... of which is the sudden alteration of form which we call muscular contraction . If we follow the course of the motor nerves in a NERVE FIBRES AND NERVE CELLS . 103 direction away from. 102 THE PHYSIOLOGY OF THE COMMON CRAYFISH .
Pagina 103
... cells , not unlike the epithelial cells which have been already mentioned , but which are larger an an on -gn.1 -sgn œs -gn.2 sa gn . 24 9 NERVE GANGLIA 25.
... cells , not unlike the epithelial cells which have been already mentioned , but which are larger an an on -gn.1 -sgn œs -gn.2 sa gn . 24 9 NERVE GANGLIA 25.
Pagina 131
... ; m , vitelline membrane ; w , stalk of ovisac . and the testis assumes a milk - white colour , at this period . The walls of the ovary are lined internally by a layer of nucleated cells , separated from the cavity of the organ. 99 32.
... ; m , vitelline membrane ; w , stalk of ovisac . and the testis assumes a milk - white colour , at this period . The walls of the ovary are lined internally by a layer of nucleated cells , separated from the cavity of the organ. 99 32.
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