Page:Smithsonian Miscellaneous Collections, Volume 85.djvu/109

Rh digestion, the ultimate or hepatic caeca secreting a digestive juice as in Lepidurus and other crustaceans having such glands.



ap, anal plate; as, anal somite; cs, central stomach; d.g., digestive glands; d.g'., lateral digestive glands; e, eye; h.c., hepatic caeca; i, intestine; s and s', anterior lobes of stomach; sc, anterior central lobe of stomach; t, telson.

(About ✕ 7.) Diagrammatic outline of digestive organs. Most of the data on which this figure is based are shown by the specimens illustrated on plate 16, figures 1, 3 and 4. The exact relations of the anterior central lobe of the stomach to the central stomach are unknown as there appears to be a line separating them.

The anus is supposed to have heen at the last thoracic segment beneath the platelike structure shown on figure 3, plate 17.