Kansas University quarterly . ular of an unknown fish, which evidently does not belongto the Satirodontidcv, and with this fact in view it must be referredto this genus with doubt The fourth and last of these bones, Fig. 4, may be an infra-opercular. It is the largest of the bones underconsideration, and is very thin and flat, excepting on one of thesides, where it suddenly thickens into a prominent ridge, whichprobably continues to the border. The bone is finely striated onboth sides. Lawrence, Kas., Jan. 6, i8gg. ?Estimated. +Since the above articl-has gone to press I find that two of the bo
Kansas University quarterly . ular of an unknown fish, which evidently does not belongto the Satirodontidcv, and with this fact in view it must be referredto this genus with doubt The fourth and last of these bones, Fig. 4, may be an infra-opercular. It is the largest of the bones underconsideration, and is very thin and flat, excepting on one of thesides, where it suddenly thickens into a prominent ridge, whichprobably continues to the border. The bone is finely striated onboth sides. Lawrence, Kas., Jan. 6, i8gg. ?Estimated. +Since the above articl-has gone to press I find that two of the bones describedabove, platexi, figs 1, 3, and .5. have been figured by Prof. Cope, Cret. Vert. West., , figs. 4. 4a, and 8. The last of these is called an ?uncertain bone, and the first aHyomandibular, which, of course, is incorrect. PLATE X. Opercular bones of Xipliactiniis, one-third natural size: Fig. I, Opercular. Fig. 2, Prcopercular. Fig. 3, Supposed Snlnpcrciilar. 1\AN. Univ Vor,. VIII. Series A. PLATE S. Prentice, from nature. }^LA 1 E XI. Figs. 1. 2, 3, 4, and 5. Bones from the region of the skull ofXiphactinus, the exact position of which can not be made out. One-half natural size. Kan. Univ. Quar., Vol. Vltt. SERtES A. PLATE Xf.
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