. Elementary text-book of zoology. Zoology. PIIYLLOPODA. CLADOCERA. 421 tubes by the side of the alimentary canal. In the ovaries groups of four cells are separated • one cell of each group becomes an ovum, while the rest are employed as nutritive cells for the nourishment of the ovum, which increases in size and absorbs fat globules. The ovary is directly continuous with the oviduct, which opens dorsally beneath the shell into the brood-pouch. The testes, like the ovaries, lie at the sides of the intestine and are continuous with the vasa deferentia, r- - D. Br FIG. 334.—Duphaiti. C, Heart—th
. Elementary text-book of zoology. Zoology. PIIYLLOPODA. CLADOCERA. 421 tubes by the side of the alimentary canal. In the ovaries groups of four cells are separated • one cell of each group becomes an ovum, while the rest are employed as nutritive cells for the nourishment of the ovum, which increases in size and absorbs fat globules. The ovary is directly continuous with the oviduct, which opens dorsally beneath the shell into the brood-pouch. The testes, like the ovaries, lie at the sides of the intestine and are continuous with the vasa deferentia, r- - D. Br FIG. 334.—Duphaiti. C, Heart—the slit-like opening of one side is visible; D, alimentary canal; L, hepatic diverticulurn ; A, anus ; G, cerebral ganglion ; O, eye ; Sd, shell gland ; Br, brood-pouch beneath the dorsal reduplicature of the shell. which open to the exterior ventrally behind the last pair of appen- dages or at the extreme end of the body, the openings being some- times situated on small slightly protrusible prominences. The smaller males usually appear in the autumn ; they may, however, also be present at any other time of the year, and, as recant investi- gations have proved in a tolerably satisfactory manner, always when. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
