. Bulletin. Science; Natural history; Natural history. 30 BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 75. ECT MPT POP 10 MW J Figure L Lateral aspect of intact skull: A, angular; D, dentary; E, ethmoid; ECT, ectoptery- goid; ENT, entopterygoid; EO. epiotic; F, frontal; lOP, interopercular; J, jugal; L, lacrynial; MPT, metapterygoid; MX, maxillary; N, nasal; OP, opercular; P, palatine; PA, parietal; PF, prefrontal; PM. premaxillary; PO. prootic; PS, parasphenoid; PV, prevomer; POP, preopercular; PTS, pterosphenoid; PTT, posttemporal; Q, quadrate; SCL, supracleithrum; SOC, supraoc- c
. Bulletin. Science; Natural history; Natural history. 30 BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 75. ECT MPT POP 10 MW J Figure L Lateral aspect of intact skull: A, angular; D, dentary; E, ethmoid; ECT, ectoptery- goid; ENT, entopterygoid; EO. epiotic; F, frontal; lOP, interopercular; J, jugal; L, lacrynial; MPT, metapterygoid; MX, maxillary; N, nasal; OP, opercular; P, palatine; PA, parietal; PF, prefrontal; PM. premaxillary; PO. prootic; PS, parasphenoid; PV, prevomer; POP, preopercular; PTS, pterosphenoid; PTT, posttemporal; Q, quadrate; SCL, supracleithrum; SOC, supraoc- cipital; SOP, subopercular; SPH, sphenotic; ST, supratemporal. CRANIAL SKELETON Nasal region.—The nasals are flat, narrow, and rectangular, somewhat widened posteriorly and slightly convex (Fig. 1). They are separated by a fontanelle, and overlap the anterior margins of the frontals and the posterior margin of the ethmoid. The prefrontals form the anterior margins of the orbits. Their posterior portions fuse medially behind the ethmoid, while their lateral edges are expanded into thin wing-like processes. They are bordered posteriorly by the frontals, anteromedi- ally by the ethmoid, and anteriorly by the lateral ethmoids. Anteroventrally they rest on the para- sphenoid. A well-developed olfactory foramen perforates each prefrontal near their area of fusion. The single ethmoid is situated medially between the prefrontals posteriorly and the lateral ethmoids anteriorly. On its dorsal surface it bears a slightly raised medial ridge which slopes anteroventrally and connects with the prevomer. The single, toothless, prevomer (Fig. 2) is covered dorsally by the ethmoid and lateral. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
