Z PROCEEDIISrGS OF THE jSTATIONAL MUSEUM vol.77 



Museum of Natural History of an unusually well preserved anterior 

 portion of a skeleton (pi. 8) with the armor in place, a real concep- 

 tion of the extraordinary characteristics of this animal was first dis- 

 closed. A few teeth found in the cavities of the skull are said by 

 Matthew ^ to be identical in character with the type of Palaeoscincus 

 costatus thus establishing its identity. 



Keference of the present specimen to the genus Palaeoscincus is 

 based on similarity of dermal armor and skull resemblances to the 

 American Museum specimen. Although much of the anterior por- 

 tion of that skeleton is present, it has not yet been described, and for 

 comparative purposes one must rely almost entirely upon the excellent 

 illustrations published by Matthew. 



The specimen from the Two Medicine formation, considered here, 

 contributes so much to our knowledge of the skeletal anatomy of the 

 animal that it is described in considerable detail. The teeth, how- 

 ever, although having the general cut of the Palaeoscincus costatus 

 tooth, differ sufficiently in their details to indicate a distinct species. 



The new genus and species Edmontonia longiceps recently de- 

 scribed by C. M. Sternberg,* displays such striking likeness in its skull 

 structure to the Palaeoscincus cranium noAv before me as to raise a 

 question as to the validity of this new genus. In the arrangement 

 and number of skull plates, and structure of the palate, the two skulls 

 are almost identical, differing pricipally in proportions. The teeth 

 also are not greatly unlike the typical Palaeoscincus tooth. At this 

 time I am not fully satisfied that there are good generic distinctions 

 for separating these two genera but shall withhold final judgment 

 until other parts of the Edmontonia type have been studied. 



The occurrence of Edmontonia in the geologically higher Edmon- 

 ton formation, may lend some weight to the possiblity of its generic 

 distinctness, for few dinosaurian genera are known to pass over from 

 one formation to another. 



PALAEOSCINCUS KUGOSIDENS, new species 



Plates 1, 2, 3, 4, Figure 1 ; Plates 5, 6, and 7 



Type.—^o. 11868, U.S.N.M., consists of a complete skull; right 

 ramus; coossified atlas and axis; the third and two other cervical 

 vertebrae; ten dorsal and eleven caudal vertebrae; sacrum; two 

 ischia; portion of right ilium; right pubis; seventeen ribs half of 

 which are complete; chevrons; numerous parts of bones; and fifty 

 dermal ossifications of various kinds. The specimen was found hj 

 George F. Sternberg, June 3, 1928. 



'Natural History, vol. 22, No. 4, 1922, p. 334. 



* Trans. Roy. Soc. Canada, vol. 22, 1928, pp. 93-106. 



