RECORDS 15 



atively small in size. The Glyptodonts, though numerous and 

 well preserved, are not so easily brought into relations with 

 the later genera of the same group. 



The paper concluded with a brief examination of the remark- 

 able Ungulates, all of which are peculiar to South America and 

 especial attention was called to Ameghino's discovery, yet un- 

 published, that in Nesodoii there are three sets of functional in- 

 cisors and canines. Incredible as such an observation may be, 

 it seems to be well established. 



Henry E. Crampton, 



Secretary. 



SECTION OF GEOLOGY AND MINERALOGY. 



February 17, 1902. 



Section met at 8:30 P. M., Dr. Alexis A. Julien presiding. 



The minutes of the last meeting of Section were read and 

 approved. 



The following program was then offered : 



0. P. Hay, The. Snqut-Fishes of Kansas. 



A. A. Julien, The Effect of Various Kinds of Hone- 

 Stones on the Cutting Edge of Tools. 



Summary of Papers. 



Dr. 0. P. Hay presented a brief history of our knowledge of 

 the genus Protospliyrczna and a statement showing what por- 

 tions of the skeleton were still unknown. The parts which are 

 best known are the skull, especially the elongated snout, the 

 jaws, the shoulder-girdle and the caudal and the pectoral fins. 

 These parts have seldom been found associated, and there have 

 been established three series of species, one on the teeth, another 

 on the snout and a third on the fins. It is certain that, as new 

 collections are made and studied, some of these new species 

 will be reduced to synonymy. The author pointed out several 

 errors on the part of writers in the interpretation of different 

 elements of the skeleton and illustrated his points by means of 

 specimens. 



In his impromptu paper Dr. A. A. Julien gave a summary of 



