. Carnegie Institution of Washington publication. DLRMATEMYDIDiE. ^37 P> r. : type belongs to the Marsh collection in Yale University Museum and presents the nearly complete shell. It was obtained in the upper bed of Cretaceous marl at Hornerstown, Mon- mouth County, New Jersey, in 1872. It has been restored and fully described by Dr. G. R. Wieland, as cited in the synonymy. Dr. Wieland's figures are employed in the pres- ent work to illustrate the structure. The total length of the carapace (plate 35, fig. 1; text-fig. 296) in a straight line is 533 mm. The greatest width is 390 mm. The fo
. Carnegie Institution of Washington publication. DLRMATEMYDIDiE. ^37 P> r. : type belongs to the Marsh collection in Yale University Museum and presents the nearly complete shell. It was obtained in the upper bed of Cretaceous marl at Hornerstown, Mon- mouth County, New Jersey, in 1872. It has been restored and fully described by Dr. G. R. Wieland, as cited in the synonymy. Dr. Wieland's figures are employed in the pres- ent work to illustrate the structure. The total length of the carapace (plate 35, fig. 1; text-fig. 296) in a straight line is 533 mm. The greatest width is 390 mm. The form is that of an elongated oval, broadest behind the middle, rounded in front, more broadly rounded behind. Dr. Wieland has called attention to a double curvature along the sides. Possibly this is due to slight distortion. From side to side anteriorly the carapace is quite evenly convex; posteriorly in the restoration it is somewhat flattened. The hinder periph- erals are flared somewhat upward, but the front ones are not. The peripherals of the free borders are thin and reduced to an acute edge. In front of the axillary notch the edges of the peripherals are somewhat reverted, leaving a groove within the edges. The nuchal bone is 70 mm. long on the midline; 65 mm. wide on the free edge; 95 mm. where widest. There were 7 neurals, of which all are present except the sixth. Its form and dimensions are determinable from the surrounding bones. The seventh was not developt; the eighth is small. The table below presents the dimensions of the neurals. Most of the neurals are hexagonal, with the broader end forward. The first has the broader end behind; the second is octagonal. The absence of the seventh neural permitted the seventh pair of costals to meet in the midline. Those of the eighth pair also meet in the midline in front of the eighth neural. The single suprapygal is octagonal, 70 mm. long and no mm. wide. The peripherals are in general large. Their height, at right angles wit
Size: 1288px × 1940px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1908
