92 Upper Cretaceous Fauna from Tennessee [290 



is quite probably a member of the Volutidae and near the 

 genus Liopeplum. 



The Mitridae and Vasidae are each represented by one 

 genus. The genus Xancus of the Vasidae is represented by 

 three species which are well characterized by the manner of 

 excavation of inner lip and number of columellar folds. This 

 genus is well represented in the Upper Cretaceous and was 

 first identified from the Cretaceous quite recently by Dr. 

 Gardner. 21 The Fusidae which appeared in the Jurassic and 

 are widely developed in the Tertiary and Recent are repre- 

 sented at Coon Creek, besides the genus Fusus, by a form 

 which is considered of the rank of a subgenus under Fusus 

 and given the name Anomalofusus as a new subgenus. The 

 Fusidae are further represented by two very common well 

 characterized species for which the new genus Ornopsis has 

 been proposed. The family Fasciolariidae embraces the gen- 

 era Piestochilus and Odontofusus, the latter being repre- 

 sented by three species which are very closely related. The 

 well-characterized genus Sargana, of the Thaisidae, is repre- 

 sented at Coon Creek by two species, one of which is very 

 abundant and perfectly preserved. 



The family Busyconidae is interesting in that it appears 

 rather suddenly in the Cretaceous with numerous, diversified 

 representatives. At Coon Creek it is represented by three 

 genera and seven species. These genera are Busycon, Pyrop- 

 sis and Pyrifusus. 



Pyropsis and Pyrifusus are very abundant in the Creta- 

 ceous and have a world-wide distribution. Busycon, very 

 commonly known as Fulgur, is rarely found in the strict 

 sense in the Cretaceous. This extension of the range of this 

 common East Coast Tertiary and Recent form is of particular 

 interest. It is represented in the present Coon Creek col- 

 lection by a single well preserved specimen, a description 

 of which has been prepared for publication. This specimen, 

 aside from the absence of the protoconch is perfect and pre- 



21 Gardner, J. A., loo. cit., p. 434. 



