The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . FiG. 11. Longitudinal section of the Alimentary Canal of M. domestica. ph. Pharyngeal suction pump. oe. Oesophagus, pt. Ptilinum. crj. Supra-oeso-phageal ganglion, Lingual salivary duct. P]. Proventriculus. U. Ven-triculus. C. Crop. Proximal intestine. R. Rectum, Rectal gland. of Stomoxys described by TuUoch (1906). It serves as a goodexample of the Muscid digestive canal. It is of a suctorialcharacter, and consists of pharpix, oesophagus, crop, proventri- ALIMENTARY CANA
The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . FiG. 11. Longitudinal section of the Alimentary Canal of M. domestica. ph. Pharyngeal suction pump. oe. Oesophagus, pt. Ptilinum. crj. Supra-oeso-phageal ganglion, Lingual salivary duct. P]. Proventriculus. U. Ven-triculus. C. Crop. Proximal intestine. R. Rectum, Rectal gland. of Stomoxys described by TuUoch (1906). It serves as a goodexample of the Muscid digestive canal. It is of a suctorialcharacter, and consists of pharpix, oesophagus, crop, proventri- ALIMENTARY CANAL 85 --Cr -pint. reef - -dint. Fig. 12. The alimentary canal as it is seen on dissection from the dorsal malphigian tubes have been omitted, and also the distal portion of thelingual salivary gland [) of the right side. The duct of the crop {Cr.) isshown by the dotted line beneath the proventriculus {Pv.) and ventriculus{Ven.). Proximal intestine, Distal intestine, red. Rectum. 3—2 36 THE INTERNAL STRUCTURE OF MUSCA DOMESTICA cuius, ventriculus or chyle stomach, proximal and distal intestineand rectum. The Pharynx has already been described, and will be furtherrefeired to in the detailed description of the head (pp. 56 et seq.).At the proximal end of the fulcrum, where the oesophagusarises, there is usually a small mass of cells, which Kraepelinhas described as glandular, but which I believe to be simplyfat-cells. The Oesophagus (oes.) commences at the proximal end of thepharynx, and describes a curve before passing through theoesophageal foramen in the cephal
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