. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 26 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. The external opening of the left nasal pit is about 30° higher in Stage IV. (Fig. 5) than in Stage II. (Fig. 4). The superior oblique muscles of the eyes have their origins at or near the junction of the median arch with the mes-ethmoid. The inferior oblique of the right eye is attached to the ethmoid on the dorsal (mor- phologically left) side of this median arch and that of the left eye im- Irb. arc. elh. m. ec''eih. " hnm. till pt pal. dx. rl. orb. n. pt-pal. <!
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 26 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. The external opening of the left nasal pit is about 30° higher in Stage IV. (Fig. 5) than in Stage II. (Fig. 4). The superior oblique muscles of the eyes have their origins at or near the junction of the median arch with the mes-ethmoid. The inferior oblique of the right eye is attached to the ethmoid on the dorsal (mor- phologically left) side of this median arch and that of the left eye im- Irb. arc. elh. m. ec''eih. " hnm. till pt pal. dx. rl. orb. n. pt-pal. <! for. olf. dx. â 'ec''eth, dx. crt. mk ba-hy. Fig. D. Oblique view of the facial cartilages of P. americanus. Stage IV. Viewed from tlie same direction as in Figs. .1. and B. X 70. For meaning of lettermg, see Abbreviations under Explanation of Plates. mediately behind that of the right. The large passage ^ between the ethmoid in front, the median arch at the right (morphologically dorsal), and the trabeculsc cranii at the left (ventral) shown in Figures C and D has therefore in the growth of the cartilage been loft to accommodate the oblique eye muscles, just as the olfactory foramina in the ethmoid were left because of the presence of the olfaQtory nerves. The now ventrally projecting right ect-ethmoid partially hides in a 1 Tliis passage is seen in Figure C" directly above the pointed end of the probe inserted through the right olfactory foramen ; it is indicated in Figure D by a triangular area at the right of the dotted line, arc. eth. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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