. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 324 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY just anterior to the canal for the olfactory tract and passes dorsally, anteriorly and medially to open at the foramen apicale on the dorsal surface of the endocranium (Fig. 1, ). Romer considered that the foramen apicale was the opening of the canal for the ophthalmicus superficialis VII, but the situation of this canal seems to indicate that it contained the ramus exterior of the profundus V nerve (discussion below). The more anterior canal piercing the medial nasal
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 324 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY just anterior to the canal for the olfactory tract and passes dorsally, anteriorly and medially to open at the foramen apicale on the dorsal surface of the endocranium (Fig. 1, ). Romer considered that the foramen apicale was the opening of the canal for the ophthalmicus superficialis VII, but the situation of this canal seems to indicate that it contained the ramus exterior of the profundus V nerve (discussion below). The more anterior canal piercing the medial nasal wall leaves the nasal cavity at the dorsal part of the anteromedial recess (discussed below). This canal (Fig. 3, ) passes anteriorly to emerge on the anterior margin of the endocranium dorsal to the anterior palatal recess; it seems to have carried an anterior branch of the profundus V system. Also opening through the medial wall of the capsule is a set of branching canals (Fig. 4, ) which ramify within the internasal septum. This canal system probably contained a set of veins draining into the nasal Figure 5. Ectosteorhachis. Nasal cavity. A. Left cavity in anterior view. B. Left cavity in posterior view. Graphical reconstructions from the sectioned specimen. The nasal cavity itself is roughly elliptical in shape with the long axis of the ellipse lying at an angle of about 45° to the anteroposterior axis of the head. The inner surface of the nasal capsule is not ornamented and the only modifications of the otherwise smooth contour of its surface are caused by the pos- terior median recess (Fig. 5, ) into which the olfactory tract entered, and an anterior median recess (Fig. 5, ) (termed the ventromedial recess by Romer, and already discussed by that author). The crista lateralis broadly separates a choanal. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
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