Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] 102 ECONOMIC ZOOLOGY AND ENTOMOLOGY no special organs of respiration, but the thin walls of the skin are traversed by a network of minute blood-vessels which are separated from the air by only a very thin membrane through which the oxygen passes readily and the carbon dioxide is given off. nepkridium don&l blodd vessel hepatic cells /' ,' longitudinal muscle /i ^circular muscle fibres r epidermis .cuticle typhlosole •setae ; .' i nerve cord nephridipore ,

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Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915]  102 ECONOMIC ZOOLOGY AND ENTOMOLOGY no special organs of respiration, but the thin walls of the skin are traversed by a network of minute blood-vessels which are separated from the air by only a very thin membrane through which the oxygen passes readily and the carbon dioxide is given off. nepkridium don&l blodd vessel  hepatic cells /' ,' longitudinal muscle /i ^circular muscle fibres r epidermis .cuticle    typhlosole •setae ; .' i nerve cord nephridipore ,  Stock Photo
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Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] 102 ECONOMIC ZOOLOGY AND ENTOMOLOGY no special organs of respiration, but the thin walls of the skin are traversed by a network of minute blood-vessels which are separated from the air by only a very thin membrane through which the oxygen passes readily and the carbon dioxide is given off. nepkridium don&l blodd vessel hepatic cells /' ,' longitudinal muscle /i ^circular muscle fibres r epidermis .cuticle typhlosole •setae ; .' i nerve cord nephridipore ,
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Image ID: RYR0Y7
Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] 102 ECONOMIC ZOOLOGY AND ENTOMOLOGY no special organs of respiration, but the thin walls of the skin are traversed by a network of minute blood-vessels which are separated from the air by only a very thin membrane through which the oxygen passes readily and the carbon dioxide is given off. nepkridium don&l blodd vessel \ hepatic cells /' ,' longitudinal muscle /i ^circular muscle fibres r epidermis .cuticle typhlosole •setae ; .' i nerve cord nephridipore , nephrostome ventral vessel t I body cavity FIG. 38.—Cross-section of earthworm. The earthworm is hermaphroditic, that is, both spermatozoa and ova are produced in the same individual. The testes are two pairs of flattened glands lying in the region of the tenth and eleventh segments. These are connected with the seminal •vesicles and communicate with the exterior through the long vasa deferentia which open in the fifteenth segment. The ovaries are attached to the septa separating the twelfth and thirteenth segments. The ova reach the exterior through a pair of funnel- shaped oviducts, the mouths of which are near the ovaries.

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