Sellards — Chlamytherium septentrionalis. 145 



A second species described by Lund from South America, 

 namely, C. giganteum ( C. gigas, G. majus), is not only much 

 larger, being approximately the size of a rhinoceros, but has 

 teeth which in cross section are more oval than are those of 

 the Florida species. 



Of the five species of this genus from South America de- 

 scribed by Ameghino,* one, namely, C. iypum, has much less 

 strongly sculptered dermal scutes than those of C. septentrion- 

 alis. A second species, C. paranense, of which scutes and 

 parts of the lower jaw are known, includes animals of scarcely 

 more than half the size of those of the Florida species. The 

 structure of the teeth of C. paranense is very similar to that 

 of C. sejjtentrionalis. The last lower molar of the South 

 American species, however, is set in, and, at the base, is out of 

 line with the other molars. 0. intermedium, a species inter- 

 mediate in size between C. typum and C.parenense, is reported 

 to have been derived from the upper Miocene deposits. The 

 two remaining species, C. ? extremum and C. ? australe, are 

 reported from yet older deposits and are doubtfully referred 

 to this genus. 



The presence in Florida of a species of the South American 

 genus Chlamytherium affords another interesting example of 

 the spread of the South American fauna into the United 

 States during the late Cenozoic. 



Florida Geological Survey, Tallahassee, Fla. 



Akt. XIII. — Bournonite Crystals of Unusual Size from 

 Park City, Utah ; by Frank R. Van Horn and W. 

 F. Hunt. 



Introduction. 



The senior author of this paper visited some of the mines 

 at Park City, Utah, for a few days in June, 1911. At this 

 time Mr. A. T. Dalley of the Silver King Coalition Mines 

 Company gave the writer a crystal of bournonite. Mr. Dalley 

 was still the owner of a second crystal, which he later pre- 

 sented to the Geological Department of the University of 

 Utah. Previous to this time, the late Albert F. Holden of 

 Cleveland had obtained another crystal from Mr. Dalley which 

 is believed to be the largest crystal of bournonite in existence 

 in the United States, if not in the world. The writer afterward 



* Contribution al Conocimiento de los Marnif eros Fossiles de la Eepiibliea 

 Argentina, Actas de la Academia Nacional de Ciencias de la Eepiibliea 

 Argentina en C6rdoba, Vol. vi, 1889. 



Am. Jour. Sci. — Fourth Series, Vol. XL, No. 236.— August, 1915. 

 10 



