. Bulletin. Science; Natural history; Natural history. 1976 CRANIAL OSTEOLOGY OF A SURFPERCH 31. APPS PO 10 MM Figure 2. Lateral aspect of neurocranium. Abbreviations as for figure 1 with the fallowing additions; APPS, ascending process of parasphenoid; BOC, basioccipital; BS, basisphenoid; EOC, exoccipital; IC, intercalary; LE, lateral ethmoid. ethmoids as well as the anterior portion of the parasphenoid. It tapers posteriorly to a point just anterior to the midpoint of the orbit, where it enters a ventral medial groove in the parasphenoid. Orbital region.—The paired frontais (Figs. 2 and 3)
. Bulletin. Science; Natural history; Natural history. 1976 CRANIAL OSTEOLOGY OF A SURFPERCH 31. APPS PO 10 MM Figure 2. Lateral aspect of neurocranium. Abbreviations as for figure 1 with the fallowing additions; APPS, ascending process of parasphenoid; BOC, basioccipital; BS, basisphenoid; EOC, exoccipital; IC, intercalary; LE, lateral ethmoid. ethmoids as well as the anterior portion of the parasphenoid. It tapers posteriorly to a point just anterior to the midpoint of the orbit, where it enters a ventral medial groove in the parasphenoid. Orbital region.—The paired frontais (Figs. 2 and 3) form the anterior portion of the cranial cavity roof as well as the anterior roof and margins of the orbital chambers. They overlap the ptero- sphenoids posteroventrally and arc bordered posteriorly by the sphenotics, the parietals, and supraoccipital. Anteriorly they meet the ethmoid and the prefrontals. The lateral edges are sepa- rated from the main bones by longitudinal depres- sions which extend vcntrally as longitudinal ridges. The two frontais are joined medially by a straight suture. The pterosphenoids form the posterior dorsal roof of the orbital chambers. They arc covered dorsally by the frontais, and are bordered postcro- dorsally by the sphenotics, and postero\cntrally by the prootics. The prootics, together with the basisphenoid form the posteroventral walls of the orbital cham- bers. They are bordered anterodorsally by the sphenotics, postcrodorsally by the supratemporals, posteriorly by the exoccipitals and Ncntrally b>' the parasphenoid. On their anteroventral siuMace they bear a notch into which the ascending process of the parasphenoid projects. Two foramina arc formed on the anterior surface of each prootic which accommodate extensions of the occulomotor nerve. The small, triangular, basisphenoid (Fig. 2) rests on the parasphenoid mediall\'. It bears a dorsal process that extends upward between the prootics and the pterosphenoids. The circumorbital serie
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