. Annals of the New York Academy of Sciences. Science. Figure 4 Dermal jaw bones of various arthrodires, lateral surfaces; from specimens in the American Museum of Natural History. The dermal lower jaws of arthrodires were probably not connected with the upper jaw by means of quadrate and articular cartilages as in true fishes, but may have been fas- tened in the thick dermis surrounding the oral cavity. 1. Stenognathus gracilis.—This represents a long-jawed specialization from a Dinich- tJiys-like type. 2. Dinichthys intermedins.—The shearing portion of the jaw is raised above the plane of th
. Annals of the New York Academy of Sciences. Science. Figure 4 Dermal jaw bones of various arthrodires, lateral surfaces; from specimens in the American Museum of Natural History. The dermal lower jaws of arthrodires were probably not connected with the upper jaw by means of quadrate and articular cartilages as in true fishes, but may have been fas- tened in the thick dermis surrounding the oral cavity. 1. Stenognathus gracilis.—This represents a long-jawed specialization from a Dinich- tJiys-like type. 2. Dinichthys intermedins.—The shearing portion of the jaw is raised above the plane of the horizontal ramus which was probably embedded in the thick dermis. 3. Diplognathus miraoilis.—A very peculiar offshoot of the coccosteid type. The sym- physeal border of the lower jaw bears tooth-like projections which apparently indicate that each jaw plate could be twisted on the long axis in a manner impossible in true fishes (Dean). 4. Dinichthys curtus. 5. Dinichthys intermedins.—To the upper end of this specimen on the outer side is attached a triangular bone which may have served for the insertion of muscles and fascia movably connecting the mandible with the inner side of the skull, somewhat as the scapula of mammals is connected with 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 New York Academy of Sciences. New York, New York Academy of Sciences
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
