238 Annals of the Carnegie Museum. 



order (Fig. 7). The fragment is very small, not over .012 m. in 

 length,, but of characteristic form. The shaft is somewhat oval in 

 cross section and from the sides extend the bases of four lateral pro- 

 jections such as occur only in the genus Naosaurus. As there seem 

 to be no characters other than its size by which this specimen can be 

 separated from typical specimens of Naosaurus it seems best to retain 

 it provisionally in that genus and it may be known as 

 Naosaurus (?) raymondi. The spine is oval in section 

 with the greatest diameter antero-posterior ; the lower 

 end is expanded in the opposite direction and seems to 

 be broken not far from the point where it joined the 

 neural arch. There is no means of distinguishing the 

 front and rear sides. As indicated by the stumps the 

 lower pair of processes were located nearly opposite to 

 Pig. 7. Part eacn other and were inclined somewhat upwards. The 



r „ upper pair was located rather on the same side of the 

 spine of Nao- l r 



saurus(?)ray- s P^ ne tnan opposite to each other and one is farther up 

 mondi. \. the spine than the other. Greatest diameter of the 



upper end .004 m. 



Incertce Sedis. — There are fragments of the acetabula of two rep- 

 tiles of large size and a complete ilium of a smaller form. This latter 

 is of considerable interest, but, as in all probability it belongs to some 

 form described from another portion of the skeleton, it will not be 

 given a new name here. In outline it is somewhat between that of 

 the amphibian Eryops and the reptile Naosaurus (Fig. 8). Instead 

 of the main axis of the bone lying in the antero-posterior direction 

 it is vertical. The lower end is divided into two separate articu- 

 lar faces for the ischium and pubis, the larger (pubic?) face looks 

 almost directly downward and the smaller (ischial?) lies nearly at a 

 right angle to this with the face vertical. Just above the articular end 

 the bone is contracted into a flattened shaft and above this expands into 

 a broad thin plate. The anterior edge of the plate is turned outward 

 as a rather prominent ridge. The inner face is marked by a series of 

 prominent rugose lines radiating from a point on the shaft and serving 

 for the attachment of the sacral ribs. The length of the ilium is .090 

 m. and the width of the distal end 0.53 m. 



The other two fragments are evidently portions of the acetabula of 

 two large reptiles, probably pelycosaurs, but perhaps they were Dia- 

 dectidoz. They show no determinative characters, but indicate ani- 



