. Cretaceous reptiles of the United States. Reptiles, Fossil; Paleontology; Paleontology. MOSASAURUS. 63 described. It also boars a near resemblance to a specimen described by Prof. E. Emmous/ imder the name of EUiptonodoa co7nj)ressus. The enamelled crown is an inch and a half long, and is elliptical in transverse section, as represented in the accompanying outlines. No. 19, representing sections below the middle and at the base. The latter measures an inch antero-posteriorly, and ten lines transversely. The acute ridges No^^ divide the cro^vn into two surfaces about equal in extent and con-
. Cretaceous reptiles of the United States. Reptiles, Fossil; Paleontology; Paleontology. MOSASAURUS. 63 described. It also boars a near resemblance to a specimen described by Prof. E. Emmous/ imder the name of EUiptonodoa co7nj)ressus. The enamelled crown is an inch and a half long, and is elliptical in transverse section, as represented in the accompanying outlines. No. 19, representing sections below the middle and at the base. The latter measures an inch antero-posteriorly, and ten lines transversely. The acute ridges No^^ divide the cro^vn into two surfaces about equal in extent and con- vexity. The surfaces exhibit a faint disposition to subdivide towards the base, but for four-fifths of their length are smooth. The transverse annulation, represented by the artist in the figure, is only one of staining of the enamel, though there is a feeble constriction of the crown corresponding with the band above its middle. The base of the specimen is excavated in a funnel-shaped manner from a thin sharp edge at the periphery to the central pulp cavity. 18. Two specimens of teeth, from Mount Holly, Burlington County, New Jersey, contained in the museum of the Academy of Natural Sciences. One of the specimens, represented in Fig. 9, Plate IX, consists of the shed crown of a tooth, much worn at the apex. In its present condition it measures nineteen lines long, extending from the enamel border at the base, and in transverse section is elliptical, as represented in the outer of the accompanying outlines. No. 20. The antero-posterior diameter at base, in the perfect condition, measured sixteen lines, and the transverse diameter is thirteen lines and a half. The surfaces, about equally divided by the anterior and posterior acute ridges, are entirely devoid of subdivisional planes. The enamel is more rugose than in any of tlie preceding teeth, but otherwise I can see no important difference between it and several of those last described. The base is excavated in a salver-form m
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectpaleontology, bookyea
