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On the Pharyngeal or Salivary Gland of the Earthworm.

1920; The Company of Biologists; Volume: S2-65; Issue: 257 Linguagem: Inglês

10.1242/jcs.s2-65.257.33

1477-9137

D. Keilin,

Invertebrate Taxonomy and Ecology

ABSTRACT It is well known that the dorsal wall of the pharynx in all earthworms is much thickened, and forms a real pharyngeal bulb, which bulges prominently into the coelomic cavity. By dissection from the dorsal surface of the earthworm, this pharyngeal bulb can be easily seen with an ordinary lens and, in the larger specimens, even with the naked eye. It is richly vascularized and its surface is irregular and tabulated. In longitudinal median section the pharyngeal bulb is seen to be composed of the three following portions : (1) an external epithelial sheath, (2) a median mass of musculo-vascular tissue, and (3) an internal portion composed of aggregates of deeply-staining cells.