. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 300 BULLETIN : MUSEUM OP COMPARATIVE ZOOLOGY MORPHOLOGY (Figures 2 to 7) Visceral Arches. All that remains of the hyoid arch in Gigan- tura and Bathyhptus are the hyomandibular and the quadrate; the ventral elements of this arch and the branchiostegal rays are absent. There do not seem to be any cartilages either supporting or associated with the gills. In both genera the first gill slit is the longest and lenticular, the second is shorter and elliptical, soc eth. den Figure 3. Skull of Gigantura vorax in lateral aspe
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 300 BULLETIN : MUSEUM OP COMPARATIVE ZOOLOGY MORPHOLOGY (Figures 2 to 7) Visceral Arches. All that remains of the hyoid arch in Gigan- tura and Bathyhptus are the hyomandibular and the quadrate; the ventral elements of this arch and the branchiostegal rays are absent. There do not seem to be any cartilages either supporting or associated with the gills. In both genera the first gill slit is the longest and lenticular, the second is shorter and elliptical, soc eth. den Figure 3. Skull of Gigantura vorax in lateral aspect, composite. Ab- breviations: an, angular; aut, autopalatine; hoc, basioceiptal; bsp, basi- sphenoid; den, dentary; eoc, exoceipital; epg, eetopterygoid; epi, epiotie; eth, mesethrnoid; fr, frontal; liyo, hyomandibular; iop, interopercular; lie, supraorbital lateralis canal; max, maxilla; mtp, metapterygoid; n, nasal; op, opercular; jxis, parasphenoid; pec, preethmoid cornu; phg, preopercular-hyomandiljular gap; pif, pineal foramen; pop, preopercular; pro, prootic; psp, pterosphenoid (alisphenoid) ; pto, pterotic; qu, quadrate; soc, supraoccipital; sop, subopercular; sphot, sphenotic; sub, suborbital (?)• the third is shorter and D-shaped, the fourth is very small and circular, and there is no slit behind the hemibranch. In botb genera the anterior set of pharyngeal teeth is in the roof of the pharynx behind the last gill slit and anterior to the sus- pensoria, while the posterior set is in the roof of the esophagus. 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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