. Carnegie Institution of Washington publication. EMYDID^E. 305 The posterior border of the bone is 5 mm. thick, while the anterior sutural border is 8 mm. thick. This is due evidently to the formation of a ridge on the fifth and sixth costals for the reception of the inguinal buttress. No. 1173 of the American Museum forms Cope's third specimen. There is present a portion of the first costal with the articular surface for the axillary buttress. There is a rough drawing by Cope on which this bone is traced as belonging to the xiphiplastrals. This bone belonged to a much larger individual than
. Carnegie Institution of Washington publication. EMYDID^E. 305 The posterior border of the bone is 5 mm. thick, while the anterior sutural border is 8 mm. thick. This is due evidently to the formation of a ridge on the fifth and sixth costals for the reception of the inguinal buttress. No. 1173 of the American Museum forms Cope's third specimen. There is present a portion of the first costal with the articular surface for the axillary buttress. There is a rough drawing by Cope on which this bone is traced as belonging to the xiphiplastrals. This bone belonged to a much larger individual than that represented by No. 1181, but the scar for the buttress is no longer. This costal was at least 35 mm. wide and is 7 mm. thick where it joined the first and second peripherals. The outer surface is smooth. With this lot is a portion of the third right peripheral, excavated at the hinder end to form a part of the sternal chamber. Fig. 387 represents the sutural surface which articulated with the second peripheral. It will be seen that the free border is broadly rounded. Fig. 388 presents the outlines and a view of the anterior articular surface of a hinder free peripheral. This is recurved and has an acute edge. The surface is uneven; and the sulci are narrow but sharply imprest. No. 1258 appears to represent another portion of Cope's principal specimen. Among the bones is an entoplastron, but not the one described bv Cope. The one which turnisht Professor Cope's figure 12 is not one-half the size of nature, as stated, but four-sevenths. The breadth of the entoplastron of No. 1258 is 37 mm., its antero-posterior extent 24 mm., 2 mm. less than that given by Cope. The longitudinal sulcus is very obscure, while the humero-pectoral plainly crosses the bone about the middle of the length. The internal face of the bone is badly weathered, so that little regarding the position of the bone can be determined therefrom. The anterior border is damaged for most of its extent. There is a
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