. Elementary text-book of zoology. Zoology. eggs FIG. 259.—Egg with embryo (a, and hatched larva (6) of PoJystomim/ integerrimum ; ZU-, ,1 operculum (after E. Zeller)! forces the. E Me- anterior end of the body with the °-enital FlG- '^s. qerrimum (after E. Zeller). opening through the mouth of the bladder 'o, mouth; Go, genital nearly as far as the anus. The development °Pen'ns ; D, intestine ; C , -I -i . "", copulatory opening the embryo takes place in water and occu- (lateral pads) ; Da, yolk pies a period of many weeks, so that the sland rtuct ; s> sucker ; Or, ovary ; If, ho
. Elementary text-book of zoology. Zoology. eggs FIG. 259.—Egg with embryo (a, and hatched larva (6) of PoJystomim/ integerrimum ; ZU-, ,1 operculum (after E. Zeller)! forces the. E Me- anterior end of the body with the °-enital FlG- '^s. qerrimum (after E. Zeller). opening through the mouth of the bladder 'o, mouth; Go, genital nearly as far as the anus. The development °Pen'ns ; D, intestine ; C , -I -i . "", copulatory opening the embryo takes place in water and occu- (lateral pads) ; Da, yolk pies a period of many weeks, so that the sland rtuct ; s> sucker ; Or, ovary ; If, hooks. young larvae are only hatched when the tad- poles have already acquired internal gills. The larvae resemble Gyrodactylus, and possess four eyes, a pharynx and alimentary canal, as well as a posterior disc (for attachment), which is surrounded by sixteen hooks. They possess five transverse rows of cilia ; three are ventral and anterior, two dorsal and posterior. There is also a ciliated cell upon the anterior extremity. The larva? now migrate. 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
