Volume 29, Plate III / Entomology (Insects)
Circulating & Respiratory Organs of Insects
- Dorsal vessel
- Chambers of the dorsal vessel
- Spiracles or stigmata
- to 5. Simple forms of a spiracle
- Hinder stigmata of Dytiscus marginaliæ
- Small holes for the passage of the air in the common cockchaffer
- Circular membrane is stretched over the valves of the water-beetle
- Air tubes of Nepa cinerea
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