. Breviora. 10 BREVIORA No. 389 son. Figure 5. Internal surface of the lower jaw. Sutures in the presinned coronoid region are uncertain. X 1. The teeth of Gracilisuchus are of the typical thecodont type common among carnixorous archosaurs — somewhat flattened mediolaterally, sharp-pointed and curxed somewhat posteriorly toward their tips. Only two small teeth are definitely preserved in the only specimen in which the premaxillae are present, but the space available suggests the presence of a third. A disarticu- lated maxilla of the txpe skull has fortunately preserved a nearly complete series
. Breviora. 10 BREVIORA No. 389 son. Figure 5. Internal surface of the lower jaw. Sutures in the presinned coronoid region are uncertain. X 1. The teeth of Gracilisuchus are of the typical thecodont type common among carnixorous archosaurs — somewhat flattened mediolaterally, sharp-pointed and curxed somewhat posteriorly toward their tips. Only two small teeth are definitely preserved in the only specimen in which the premaxillae are present, but the space available suggests the presence of a third. A disarticu- lated maxilla of the txpe skull has fortunately preserved a nearly complete series of maxillary teeth, not fully thecodont. About 14 appear to have been present. From a small first tooth, there is a steady increase in size to the fourth, following which there is a steady reduction to small elements for the last half dozen of the series. The lower teeth are not fully preserved, but the evi- dence suggests that none were of large size, and that there was a rather e\en row of small teeth, spaced about mm apart, to a total of 16 or so. AXIAL SKELETON A considerable amount of xertebral material of Gracilisuchus is present in the collection. The holotype when entombed pos- sessed a complete articulated presacral series (Fig. 6). However, the nodule in which the specimen was preserved had undergone considerable damage before collection. A spht had occurred in the nodule that slanted back down most of the length of the series of dorsal vertebrae and, with the loss of a large chip adja- cent to it, caused the complete loss of the posterior cervical and anterior dorsal vertebrae and damage to the remainder of the dorsals. The second and third vertebrae from the end of the series are obviously sacrals. Most of the ribs of the right side are preserved in their original position. This aids greatly in de- termining the spacing of the missing vertebrae, as does, further, a calculation, from known lengths of cervical and posterior dor- sals, of the number of vertebrae
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