. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 52 Bulletin Museum of Comparative Zoology, Vol. 150, No. 2 onterior ceratohya /dorsal hypohyal ^ventral hypohyal basihyal basibranchial branchiostegal ray gill raker with denticles infrapharyngobranchia basibranchial 2 hypobranchial I tooth plate hypobranchial 2 basibranchial 3. epibranchial infrapharyngobranchia I epibranchial infrapharyngobranct epibrar infrapharyngobranchial 4' 'epibranchial 4 ceratobranchial hypobranchial 3 basibranchial 4 ceratobranchial 2 ceratobranchial 3 ceratobranchial 4 ceratobranchial 5 Fig
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 52 Bulletin Museum of Comparative Zoology, Vol. 150, No. 2 onterior ceratohya /dorsal hypohyal ^ventral hypohyal basihyal basibranchial branchiostegal ray gill raker with denticles infrapharyngobranchia basibranchial 2 hypobranchial I tooth plate hypobranchial 2 basibranchial 3. epibranchial infrapharyngobranchia I epibranchial infrapharyngobranct epibrar infrapharyngobranchial 4' 'epibranchial 4 ceratobranchial hypobranchial 3 basibranchial 4 ceratobranchial 2 ceratobranchial 3 ceratobranchial 4 ceratobranchial 5 Figure 10. Branchial apparatus of D. taenia (USNM 206614; mm SL), dorsal view; portions of right side removed; left side spread laterally. Tooth plates in black. what concave anteriorly and straight pos- teriorly. About 20% of the dorsal area of the subopercle lies medial to the opercle. The anterior border lies medial to and articulates with the interopercle. The interopercle is an irregularly- shaped bone which lies anterior and an- teroventral to the subopercle (Figs. 4, 8). Ventrally, the anterior border is slightly concave, with an indentation in the area near the interhyal bone; dorsally, the an- terior border is convex. The posterior border is convex along its articulation with the subopercle and then broadly convex to the anteroventral apex of the bone. The interopercle articulates by connective tissue to the medial surface of the preopercle (see Fig. 4). Branchial Apparatus The infrapharyngobranchial of the first arch is a rod-shaped bone which is rela- tively thin in cross section dorsally, and larger and almost triangular in cross sec- tion ventrally. It articulates dorsally with the prootic, near the midpoint of that bone (Fig. 4), and ventrally diarthrodially with the anterolateral border of the epi- branchial of the first arch (Figs. 10, 11). There are no tooth plates associated with infrapharyngobranchial 1. The bone lies, in lateral view, in a more or less do
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