293] B. Wade 95 



duced keel and angular shoulder. Most of the specimens in 

 this family that have been described from the Cretaceous of 

 the Eastern United States have been referred to the genus 

 Straparollus, and in most cases these specimens are casts 

 and do not show any shell characters, so that it is possible 

 that some of these casts belong to Hippocafrnpoides. The 

 family Turbinidae is herein reported from the Cretaceous 

 of Eastern North America for the first time. This family 

 is abundantly developed in the Paleozoic and is common in 

 the Eecent. The new genus Schizobasis which is character- 

 ized by a very unique, flattened notch-like anterior canal 

 is referred after some hesitation to the family Turbinidae. 

 The families Trochidae and Umboniidae which have repre- 

 sentatives from the Silurian to the Recent are each repre- 

 sented by a genus in the Coon Creek fauna. These genera 

 are Solariella and Teinostoma respectively and are both 

 herein reported for the first time from the Cretaceous of 

 North America. Another genus hitherto unknown in Ameri- 

 can Cretaceous is Liotia of the family Delphinulidae and in 

 this family occurs another very abundant form at Coon Creek 

 for which the genus Urceolabrum is here proposed. This 

 seems to be a well denned generic group near Liotia but dis- 

 tinctly different from typical Liotiae occurring in the same 

 strata. Besides the Coon Creek species Urceolabrum includes 

 an undescribed species from Aufaula, Alabama, and another 

 from the Aachen beds 25 of Vaals, Germany. 



In addition to the above cited genera there are probably 

 as many as thirteen genera of Gastropoda, including that 

 many and more species whose generic and .family relations 

 cannot be assigned with assurance on account of their frag- 

 mentary character. 



The point of greatest interest in the Coon Creek gastro- 

 pods is the occurrence of eight new genera and one new pub- 

 genus, many of which are represented by more than one spe- 



25 Holzapfel, E., Palaeontographica, Band xxxiv, p. 170, Taf . xviii, 

 figs. 3-7. 



