. Carnegie Institution of Washington publication. THE MICROSAURIAN FAMILY of the skull between the orbits. The parietal is apparently the largest element of the cranial roof and the pineal foramen is located in the anterior fourth of the median suture separating the parietal elements. The form of the postparietal and the tabu- lare can not be determined, as the greater part of this region is lacking. The squa- mosal seems to be located well forward and is rather small, but has the usual rela- tion of this element. Only fragments of the other ele- ments remain and nothing can be sa
. Carnegie Institution of Washington publication. THE MICROSAURIAN FAMILY of the skull between the orbits. The parietal is apparently the largest element of the cranial roof and the pineal foramen is located in the anterior fourth of the median suture separating the parietal elements. The form of the postparietal and the tabu- lare can not be determined, as the greater part of this region is lacking. The squa- mosal seems to be located well forward and is rather small, but has the usual rela- tion of this element. Only fragments of the other ele- ments remain and nothing can be said of their form. The mandibles of both sides are represented by depres- sions, and they are ornamented with longitudinal grooves and ridges. The teeth are not preserved, but there are evidences of the maxillary teeth. These are minute and sharply conical. Just posterior to the skull there is pre- served the impression of a short, round rod which is not definitely determined. It may be an element of the hyoid apparatus, although it is rather stout for such. It does not have the relations indicated by Cope in his figure (123, pi. xxxiv, fig. i). There are three elements of the pectoral girdle pre- served. These undoubtedly represent the interclavicle and the clavicles. The interclavicle is rhomboid in shape and is attenuated posteriorly. The attenuation is ab- ruptly truncate posteriorly and it is thus of quite a dif- ferent character from the acutely pointed interclavicle of T. minimus. The clavicle has a somewhat semicir- cular form, but is not attenuated at either end. It seems to be uniformly broad. The forearm of the right side is preserved in part. The humerus is seen to be a heavy, somewhat expanded element lying displaced with relation to the pectoral girdle. It is greatly expanded at the ends. The ulna presents characters similar to the humerus and only dif- fers from it in being shorter and less stout. The radius is not preserved. The carpus is unossified and its posi-
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