Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 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
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 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
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