. A manual of zoology. Zoology. 412 ARTHROrODA An intcrcstin,!:; adaptation of tlic tracheal system to acquatic life occurs in the lar\:e of many Archiptera ^drasjontlies and Mayflies) and Xeuroptora, and even anions; Lepidoptera (Pardp,>iiYx) and Coleoplera (Gyrinidii;). The spiira- eles here are usually closed, and oxvL,'en is taken either through the skin or Ly so-called tracheal trillsâInishv or leaf-like appendages of the surface or the rectum, riclilv permeated by tracheal branches (t'lg. 453V In such cases the tracheal svstem has two portions, one which receiws oxygen from and gives
. A manual of zoology. Zoology. 412 ARTHROrODA An intcrcstin,!:; adaptation of tlic tracheal system to acquatic life occurs in the lar\:e of many Archiptera ^drasjontlies and Mayflies) and Xeuroptora, and even anions; Lepidoptera (Pardp,>iiYx) and Coleoplera (Gyrinidii;). The spiira- eles here are usually closed, and oxvL,'en is taken either through the skin or Ly so-called tracheal trillsâInishv or leaf-like appendages of the surface or the rectum, riclilv permeated by tracheal branches (t'lg. 453V In such cases the tracheal svstem has two portions, one which receiws oxygen from and gives off carbon dioxide to the water; the other which supplies the tissues with oxy- gen and receives carbon dioxide. Since the trachex. with their line branches, supply the tissues directly with oxvgen, the blood-\-ascular system is rudimeiilary. Directly under the back lies the elongate tubular heart in a special pericardial sinus. Tliis is a part of tlie kemoccEle cut oft from the gastric portion of tliis space. .-1. D. Fig. 434.â. 1. Male genitalia of Mdohnitha (from Gcgcnbaur. after Fabre). g!, accessor>" glamls; /, testes; vd, vas tlefcrcns; ^L'^^ seminal â \"csicles. B. genitalia of female HYdrohius (from Gegenbaur, after Stein), be, bursa copulatrix; s;/, tubular gkinds; o, ovarial tubes; in', oviduct with glands; rs, rcceptaculum seminis; v, vagina. by an incomplete partitioii in wliich, right and left, are the Literal muscles (aUc cordis) of the heart. Siitce folds from the margins of the ostia ex- tend into the ca\ity of the heart, and in the systole, wliich proceeds front beliind forward, not only close the ostia, but prevent any back flow of blood into the posterior part of tlie heart, there is tin appearance of a chamber- ing of the heart. The blood passes forward through an tmterior aorta into the luemocale and from this back to the pericardial sinus, the alary muscles aiding by moving the viscera, and enlarging the The arrangement of the visce
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
