Handbook of Invertebrate Zoology: for Laboratories And Seaside Work
Handbook of Invertebrate Zoology: for Laboratories And Seaside Work
William Keith Brooks
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84. — The anterior end of the earthworm, opened along the dorsal /^' surface, to show the digestive organs. ;|, /7. (From Lankester, Anatomy of the /f. Earthworm, Quar. Jour. Mic. So., ^ /j; 1864, P. VII., Fig. 5.) 7, £-19, The nineteen anterior segments. a. Cerebral ganglia. b. Pharynx, c. (Esophagus, d. Pos- terior portion of it. e. (Esophageal glands. /. Crop. g. Gizzard. h. Dorsal blood-vessel. i. Aortic Fig. 84. arches, k. Testes. I, Intestine. The first pair are a little larger than the o...thers, and if they are removed from the oesophagus, and opened upon a slide, and examined with a microscope, they will be found to contain solid crystalline bodies, which dissolve, with active effervescence, when treated with acid. Digitized by VjOOQIC ANATOMY OF THE EARTHWORM. 145 e. At about the sixteenth segment, the digestive tract nddenly dilates, and forms a large, muscular, highly vascular, heart-shaped crop (Fig. 84,/), which, in the living animal, usually exhibits muscular contractions, even when the animal has been opened.
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