. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 44 Bulletin Museum of Comparative Zoology, Vol. 150, No. 2 extrascQpular /hyomandibula .infraorbitals 1-6 opercle preoperole mesopterygoid supraorbital antorbital palatine subopercle interopercie. premaxilla dentary maxilla supramaxillae anguloarticular branchiostegal ray; retroarticular' Figure 8. Suspensorium and infraorbital bone series of D. taenia (USNM 206614; mm SL), lateral view. supraorbital and the first infraorbital (lOl), so may be excluded from the an- terior border of the orbit. Infraorbital 1 lies
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 44 Bulletin Museum of Comparative Zoology, Vol. 150, No. 2 extrascQpular /hyomandibula .infraorbitals 1-6 opercle preoperole mesopterygoid supraorbital antorbital palatine subopercle interopercie. premaxilla dentary maxilla supramaxillae anguloarticular branchiostegal ray; retroarticular' Figure 8. Suspensorium and infraorbital bone series of D. taenia (USNM 206614; mm SL), lateral view. supraorbital and the first infraorbital (lOl), so may be excluded from the an- terior border of the orbit. Infraorbital 1 lies along the anteroven- tral border of the orbit. There is a small sensory canal on the dorsal border, an- teriorly. Anteriorly, the dorsal border is concave and follows the rim of the orbit; more posteriorly, the dorsal border be- comes gently convex. The ventral border is more or less convex. Posteriorly, lOl lies medial to I02. Infraorbital 2 fomis the ventral border of the orbit. There is a laterally-project- ing bony lamella along the dorsal border ot I()2. Anteriorly, an open sensory canal extends just ventral to the lamella, then, just posterior to the mid-length of the bone, the canal extends posteroventrally to meet the canal on I03. The ventral border of the thin bony lamella of I02 is more or less convex. The posterior border of I02 is slightly convex dorsally, be- tween the dorsal border of the bone and the sensory canal; ventral to the sensory canal, the border may be more or less posterior to lOl and the anterior portion of I03. Infraorbital 3 is the largest of the in- fraorbital series. Anterodorsally, its bor- der forms a portion of the orbital rim; pos- teriorly, the bone covers much of the "cheek" area and the adductor mandib- ulae muscles. The ventral border of I03 is slightly convex anteriorly; more pos- teriorly, there is an abrupt ventral angle, and the ventral border is more deeply concave (this is dorsal to the area where the supramaxilla abuts I
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
