. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. NERVOUS SYSTEM. 81 At a higher stage of development a cii-cum-pharyngeal nerve ring is developed. With the commencing segmentation of the body the number of ganglia increases, and in addition to the brain there is present a ventral nervous system consisting either of ventral cord. FiQ. 76.—Alimentary canal and nervous system of Mesosto- mum Ehrenbergi (after Graff). G, the paired cerebral ganglia with two eye-spots; St, one of the two main lateral ner\'es ; canalwith mouth and pharynx.
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. NERVOUS SYSTEM. 81 At a higher stage of development a cii-cum-pharyngeal nerve ring is developed. With the commencing segmentation of the body the number of ganglia increases, and in addition to the brain there is present a ventral nervous system consisting either of ventral cord. FiQ. 76.—Alimentary canal and nervous system of Mesosto- mum Ehrenbergi (after Graff). G, the paired cerebral ganglia with two eye-spots; St, one of the two main lateral ner\'es ; canalwith mouth and pharynx. Fig. 77.—Nervous system of Fig. -Nervous system the larva of Coccinella (after Ed. Brandt). G, su- pra-oesophageal ganglion or brain; Gfr, frontal ganglion; Sj, suboeso- phageal ganglion ; 0',-G", the eleven gangUa of the ventral chain of thorax and abdomen. of adult Coccinella (after Ed. Brandt). Ag, optic ganglion. The other let- ters as in fig. 77. (Gephyrea) or of a ventral chain of ganglia, which may have a homonomous (Annelids) or heteronomous (Arthropods) arrangement (figs. 77 and 78). The couoentration of the nervous system begun. 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; Metcalf Collection (North Carolina State University). NCRS. London, Swan Sonnenschein
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
