. Cope papers, 1871-[1897. Zoology; Paleontology. Fig. 24âAmphiuma means (from Georgia); profile of cranium. appears to be demonstrated that the squamosal portion of the tem- poral bone of the Mammal is the preoperculum of that type.* 6. On the Homologies of tJie Columella. With regard to the character of the Reptilian columella, the following conclusions seem to be indicated by a study of the crania of CrocodUus, Lystrosaurus, Chelydra, and Iguana. There are two modes in which the parietal arch is completed laterally among Reptiha. The usual mode among Vertebrates is where an alisphenoid conn
. Cope papers, 1871-[1897. Zoology; Paleontology. Fig. 24âAmphiuma means (from Georgia); profile of cranium. appears to be demonstrated that the squamosal portion of the tem- poral bone of the Mammal is the preoperculum of that type.* 6. On the Homologies of tJie Columella. With regard to the character of the Reptilian columella, the following conclusions seem to be indicated by a study of the crania of CrocodUus, Lystrosaurus, Chelydra, and Iguana. There are two modes in which the parietal arch is completed laterally among Reptiha. The usual mode among Vertebrates is where an alisphenoid connects the parietal and sphenoid bones. This characterizes the Crocodilia and In the second mode, the peculiar bone called the columella stands pillar- like on the pterygoid, supporting the parietal (in Gecconidse not reaching the latter). This arrangement characterizes the Lacer- tilia, where the alisphenoid is entirely absent. In the Ophidia and Testudinata, the parietal sends down a plate-like border or process on each side, which in the latter articulates with a flat bone, which * The bone homologized by Huxley (Elem. Comp. Anat,, 15gs. 69-73, Sq) with the squamosal in the Telosei must, if the above determination be correct, hare another interpretation. â f The deourred margin of the parietal takes its place in the 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 Cope, E. D. (Edward Drinker), 1840-1897. Philadelphia, etc.
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