REPTILIA OF KIRTIAND FORMATION GILMORE 169 



BAENA NODOSA Gilmore 



Since Baena nodosa was first described in 1916, no less than eight 

 specimens acquired by the National Museum have been identified 

 as pertaining to this species. Four of these have been commented 

 on previously (1920). Two were obtained from C. H. Sternberg, 

 and the other two were collected by the 1929 paleontological expedi- 

 tion. All have the characteristic nodelike ornamentation of the 

 carapace and in most respects are in accord with the type specimen. 

 Two specimens (U.S.N.M. nos. 12819 and 11323) differ from the 

 type in having a more broadly rounded anterior border of the cara- 

 pace, and no. 11323 also has the nodes more sparsely placed over 

 the surface of the shell. In all other respects these specimens show 

 no discordant features. That the type is not a large example of 

 the species is indicated by the length of the carapace at the center — 

 375 mm, 380 mm, and 403 mm in three individuals — whereas in the 

 type the length is only 354 mm. 



U.S.N.M. no. 12819, collected by G. F. Sternberg 3 miles north- 

 east of Hunter's Store, San Juan County, N. Mex., shows that the 

 restored scallops along the rear border of the type specimen as 

 illustrated in my original description are in error. Away from 

 the central ones they become more rounded transversely with shal- 

 lower indentations between them, instead of being bluntly pointed 

 and having deep emarginations. 



A nearly complete but somewhat crushed shell (U.S.N.M. no. 

 11327) is of interest in confirming the presence of this species in the 

 Fruitland formation. It also records a new locality for the species — 

 Coal Creek, 3 miles southeast of Tsaya, San Juan County, N. Mex. 



In the collection made for the University of Upsala by C. H. 

 Sternberg, Wiman (1933) found 17 specimens that he identified as 

 pertaining to Baena nodosa. Eight of these are from the Kirtland 

 formation, five from the Fruitland, and four are without designa- 

 tion as to horizon. Wiman calls attention to the great variation in 

 the dermal scuta and in the form of the carapace. He finds none 

 that are precisely in accord with the type of the species. Regard- 

 less of the differences found, he concludes that all should be referred 

 to B. nodosa, a conclusion with which with one exception I am fully 

 in accord. Specimen no. 9 of his series, in which he regards the 

 lateral and marginal scutes as being wholly abnormal, may possibly 

 pertain to the genus Boremys. If this suggestion is correct, it marks 

 the first recorded occurrence of this genus in the Fruitland. 



Genus BOREMYS Lambe 



The genus Boremys was established by Lambe in 190G for the 

 species pulchra previously referred by him to the genus Baena. In 



