Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 NERVOUS SYSTEM. 81 At a higher stage of development a circum-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 D FIG. 76.—Alimentary canal and nsrvous system of Mesosto- mum Ehrenbergi (after Graff). G, the paired cerebral ganglia with two eye-spots; St. one of the two main lateral nerves ; Z>,alirnentary canalwithm

---

Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 NERVOUS SYSTEM. 81 At a higher stage of development a circum-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 D FIG. 76.—Alimentary canal and nsrvous system of Mesosto- mum Ehrenbergi (after Graff). G, the paired cerebral ganglia with two eye-spots; St. one of the two main lateral nerves ; Z>,alirnentary canalwithmonth and pharynx. Crt G3- G

---

Size: 848px × 2359px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage