. An elementary course of practical zoology. Zoology. TJ* Fig. 152.—A and B, two stages in the development of the chondrocranium, A. eye; AF. antorbital process; B. basal plate, formed from the parachordals ; C. notochord ; Ci. anterior process of trabecula; N, Nk. nose ; O. ear; 01. position of foramina for olfactory nerves ; PE. parachordal cartilage ; PJ^. post- orbital process ; PR. pituitary space ; S. nasal septum ; Tr. trabecula. (From Wiedersheim's Anatomy.) respectively with one another, and so form a firm floor (B) for the future brain-case, which is gradually developed by the floor
. An elementary course of practical zoology. Zoology. TJ* Fig. 152.—A and B, two stages in the development of the chondrocranium, A. eye; AF. antorbital process; B. basal plate, formed from the parachordals ; C. notochord ; Ci. anterior process of trabecula; N, Nk. nose ; O. ear; 01. position of foramina for olfactory nerves ; PE. parachordal cartilage ; PJ^. post- orbital process ; PR. pituitary space ; S. nasal septum ; Tr. trabecula. (From Wiedersheim's Anatomy.) respectively with one another, and so form a firm floor (B) for the future brain-case, which is gradually developed by the floor growing up on either side and eventually meeting to a greater or less extent above the brain : there is never, however, a complete cartilaginous roof to the cranium, parts of which are only membranous and form the fontanelles (pp. 43 and 420). In the meantime Peact. Zool. p p. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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