Archive image from page 110 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( THE CCELOM AND DORSAL VESSEL. 89 through the floating branches of a rich tracheal arborescence. Thus the respiratory function appears to be localized in the last segment, and there are few tracheae in other regions of the body.' The paucity of tra
Archive image from page 110 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( THE CCELOM AND DORSAL VESSEL. 89 through the floating branches of a rich tracheal arborescence. Thus the respiratory function appears to be localized in the last segment, and there are few tracheae in other regions of the body.' The paucity of tracheae in the young larva of the Blow-fly was observed by Weismann, but in the adult larva they are Fig. 19.—.Sections through the pericardial sinus, with the dorsal vessel in situ : /, near the anterior, and 3, near the posterior extremity of the ventricle ; / s, pericardial sinus ; //', cells of fat body ; a //;, ala; niusculares ; i s, ventral valve ; m, recti muscles ; ;', intestine ; / c, cells of the pericardial septum ; tr, trachea. abundant, a fact which does not, however, render the presence of numerous tracheae in the pericardial sinus less interesting. The Pericardial Septum (Figs. 18 and 19) forms the floor of the pericardial sinus. It consists of a double row of large ovoid cells. Weismann [2] states that there are thirteen on each side of
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