. Journal of morphology. Fig. 15 Cross section through the extreme posterior end of the occipital con-dyle of an embryo slightly younger than that represented in the preceding figures,showing the chorda dorsalis () incompletely surrounded by the occipital con-dyle which is here hypochordal in position. X 15. Figs. IG to 19 A series of four cross sections through the ethmoidal region ofan embryo having a carapace mm. long. The series is from anterior to pos-terior. In figure 16, on the right side, a cartilaginous nodule is lying in contactby its median surface with the pila supraglandu
. Journal of morphology. Fig. 15 Cross section through the extreme posterior end of the occipital con-dyle of an embryo slightly younger than that represented in the preceding figures,showing the chorda dorsalis () incompletely surrounded by the occipital con-dyle which is here hypochordal in position. X 15. Figs. IG to 19 A series of four cross sections through the ethmoidal region ofan embryo having a carapace mm. long. The series is from anterior to pos-terior. In figure 16, on the right side, a cartilaginous nodule is lying in contactby its median surface with the pila supraglandularis (). In figure 17 the pilasupraglandularis has extended ventrally and fused with the lamina terminalisanterior {). The thickening of the paries nasi to form a concha is greatestin figure 19. X 15. 772. f;p x.^/?^ —... ,#r^ Fig. 20 Cross section througli the posterior portion of the orbito-temporalregion of an embryo having a carapace mm. long, showing the pterygoideum{pt.) extending medially beneath the arteria carotis interna () and the ramuspalatinus n. facialis () to form the sulcus cavernosus of the adult pterygoi-deum. A thin osseous lamella may also be seen along the ventral crest of theplanum basale which extends further forward and fuses with theparasphenoi-deum in the region of the fenestra hypophyseos. X 15. Fig. 21 Cross section through the otic region of an embryo haying a carajjacelength of 7 mm. showing the columella auris {col.) in its relation to the first vis-ceral cleft (1) to the ramus hyomandibularis n. facialis (), and to the chordatympani (). The processus interhyalis () in its relation to the cartilagoMeckelii () is shown. X 15. Fig. 21 a A portion of figure 21 more highly magnified. X 35. 773 JOURNAL OF MORPHOLOGY, VOL. 23, N
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Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
