On the Systematic Position of the Brachiopoda

Cover On the Systematic Position of the Brachiopoda
On the Systematic Position of the Brachiopoda
Morse, Edward Sylvester, 1838-1925
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Their walls are perfectly transparent, and the circulating fluid can be seen rapidly coursing into, and out of each one in turn.
The following figure (Fig. 19) shows Fig. 19.
a row of five ampullae drawn from life, within which the blood corpuscles can be seen circulating.
Claparfede says that in the normal ^^^;J^\ branchia of an Annelid there cannot be any mixture of arterial and venous blood. The artery trav- elling as far as the end of the branchia, where it returns as a 1 Hancock, Trans. Bo
...yal Soc. Vol. cxlviii, p. 852.
3 Digitized by VjOOQIC 84 vein. He says, " Veine et art^re sont exactement parallMes I'une h Tautre. Dans toute la longueur de la branchie, ces deux vaisseaux sont mis en communicateur par une double s^rie d*anses vasculaires qui passent dans la couche sous-cuticulaire et qui subissent avee la plus grande facility Taction de Teau chargee d'oxyg^ne h travers la cuticule tres-amincie.* 1 He denies, however, the independent contraction of the ampullae, but says there is a rhythmical contraction of the whole branchia, Quatrefages, to the contrary, notwithstanding.


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