. Elementary text-book of zoology. Zoology. LOVlN's . LARVA. 363 Behind it is continued into an indifferent terminal portion equivalent to the whole body of the adult. At the apical region of the larva (fig. 294, >S^) there is a thickening of the ectoderm, which is called the apical plate. This represents the rudiment of the cerebral ganglion (apical ganglion), and gives off nerves to either side. The wide mouth (0) has a. Ms FIG. 294.—Development of Polygordim (after B. Hatschek). a, Young larva ; Sp, apical plate with pigment spot; Pric, praj-oral circle of cilia; O, mouth; Pou-, post-ora
. Elementary text-book of zoology. Zoology. LOVlN's . LARVA. 363 Behind it is continued into an indifferent terminal portion equivalent to the whole body of the adult. At the apical region of the larva (fig. 294, >S^) there is a thickening of the ectoderm, which is called the apical plate. This represents the rudiment of the cerebral ganglion (apical ganglion), and gives off nerves to either side. The wide mouth (0) has a. Ms FIG. 294.—Development of Polygordim (after B. Hatschek). a, Young larva ; Sp, apical plate with pigment spot; Pric, praj-oral circle of cilia; O, mouth; Pou-, post-oral circle of cilia; A, anus; 3fs, mesoderm ; A"7\T, head kidney, b, Older larva with commencing segmentation of the body, a second limb is developed in the head kidney, c, Older stage. The body is elongated to the form of a worm, and divided into a number of metameres ; HWk, posterior circle of cilia; Af, eye spot; F, tentacle. ventral position, and leads into an alimentary canal, which opens at the posterior end of the body (A). In front of the mouth there is a strongly developed circle (prreoral) of cilia (Prw); and behind. 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
