. Carnegie Institution of Washington publication. i< \ . sy< at thecosto-vertebral sulcus, The third left peripheral (fig. 3) has a length of 32 mm. along the free border, and a height of ^o mm. The extreme width oi the face which joins the second peripheral is 20 mm. Fig. 4 of the plate cited illustrates the tenth left peripheral. It is 21 mm. along the acute free edge, ^5 mm. high, and it has a maximum thickness ot 7 mm. The upper surface is con- cave up and down ami slightly convex fore and att. It does not appear to have formed a jagged suture with the contiguous ends ot the c
. Carnegie Institution of Washington publication. i< \ . sy< at thecosto-vertebral sulcus, The third left peripheral (fig. 3) has a length of 32 mm. along the free border, and a height of ^o mm. The extreme width oi the face which joins the second peripheral is 20 mm. Fig. 4 of the plate cited illustrates the tenth left peripheral. It is 21 mm. along the acute free edge, ^5 mm. high, and it has a maximum thickness ot 7 mm. The upper surface is con- cave up and down ami slightly convex fore and att. It does not appear to have formed a jagged suture with the contiguous ends ot the costals. The dimensions of some ot the scute areas can be only approximately determined. The nuchal scute has a length of 17 mm. and a width ot io mm. The anterior end of the Hist vertebral has a width of 57 mm. The anterior end of the fourth vertebral scute overlapt the fifth costal bone a distance of 17 mm. Its width was therefore 34 mm. plus the as yet unknown width ot the neural, amounting to probably 45 mm. The sculpture of the carapace may now be briefly described. On the nuchal bone the area occupied by the Hist vertebral scute is ornamented with longitudinal ridges, 5 in a line 10 mm. long. These ridges are more or less interrupted by the grooves concentric with the anterior border of the scute. On the area of the first marginal scute the ridges diverge at an angle with the midline and are interrupted hv grooves parallel with the midline. The distal half of the third costal is markt by ridges running downward and obliquely toward one edge ot the bone. These again are crost by ridges parallel with the distal end of the bone. The fifth costal is similarly sculptured on the distal end, but the ridges are more irregular. 1 he middle third has, along the anterior border, some strong ridges and grooves at right angles with the sutural border, while the hinder halt is occupied by conical elevations having little regularity. < )n the third peripheral bone the area above the c
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1908
