Page:Synopsis of the Exinct Batrachia and Reptilia of North America. Part 1..pdf/27

 AND AYES CI NORTH AMERICA. Pectoral bones with strong elevated radii and very weak reticulation in the centre of the median. The abdominal scales thick, ninny in a transverse series. C. CHASSISCUTATITS. Pectoral bones nearly as above; the abdominal scales slender, not more than three in a lateral transverse series. • C. MARS1111. Pectoral bones the lateral finely pitted, the pits becoming elongate towards the margin. C. FUVEATUS. COLOSTRUS CR ASSISCUTATUS, Copt'. One of the specimens of this species consists of a supero-lateral view of a crushed cranium and anterior part of the body. The median pectoral bone appears as a sagittiform plate with thin edges. rounded lateral angles and a thin median prolongation behind. '['lie greater part of the borders of the right orbit are distinct, and display the continuity of the malar and supratcuiporal regions. The ramus mandibuli is longer than the cranium proper. The number of the teeth cannot be determined, but they are rather large, and traces of their existence do not extend behind the orbits. The length of the long anterior mandibular tooth is .5mm., and the diameter at the base .1mm. Diameter of base of a superior maxillary .2mm. The approximate length of the mandibular minus is .0715m. long ; longitudinal diameter of the orbit 72mm. ; length of median pectoral plate .036m. ; width of same .019m. Other specimens (Nos. 4 and 10 coll. J. S. Newberry) show that the abdominal scutellation commences immediately behind the pectoral bones. Those near the median line are similar to the external, and they unite in a zigzag line. The depth of these scales is oblique, and is somewhat greater than the width. Thus one angle projects, and gives the surface a somewhat ribbed rather than continuous character. The following measurements express their dimensions relative to other portions of the body. .31. Width of median pectoral. .0138 Do. three pectorals restored, .(154 Do. scale band, .064 Scales in .01in. transversely to series, Do. longitudinally do., Radii of lateral pectoral crossed by .01m., Length ulna and radius, Do. metacarpus, The above measurements express the small size and weakness of the fore limb. Another which the impressions of the scales are of the same size as those of the preceding, 5.2 1.75 7 .0108 .006 specimen (No. 1$) in the impression of what may be femur and ulna and radius are visible, which are of considerably smaller size than the one above mentioned. They are but doubtfully these elements. Length proximal element, Do. two distal do., A. median pectoral plate of a seventh and much larger individual than and posteriorly. The broad posterior portion is transversely Length .063m.; with .04m. This very interesting form is part of the unique and important collection made by Prof. J. S. Newberry. at Linton, Columbiana County, Ohio. .004 .00;38 the preceding, is prolonged anteriorly ribbed, the ribs weaker and interrupted medially.