291] B. Wade 93 



sents generic characters which cannot be mistaken. The 

 species bears a striking resemblance to some of the medium- 

 sized late Tertiary and Eecent species. All the typical Ful- 

 gurs previously known have been limited to the Tertiary and 

 Eecent of the Atlantic States. The Eocene forms are small, 

 rather thin-shelled species, so it has been considered that the 

 genus evolved during that period. The living Fulgurs have 

 been very extensively studied and the life history carefully 

 worked out. The limited geographic range has been ex- 

 plained in a large measure by the fact that the animal is 

 deprived of an active free-swimming larval stage by the loss 

 of the velum before the young form emerges from the egg- 

 capsule. This same fact might well be cited to explain the 

 very limited distribution of Busy con in the Cretaceous. One 

 of the earliest Tertiary species (described and referred to 

 genus Fulgur by Harris 22 ), occurs in the Midway group of 

 the Eocene about 30 miles west of Coon Creek. 



In the family Buccinidae there is a species represented by 

 large elegant specimens which seems to belong to a well- 

 defined generic group for which the name Hydrotribulus has 

 been proposed. Species of this genus have been recognized 

 from Brightseat, Maryland and Owl Creek, Mississippi. A 

 study of the description of a species, Tudicla monheimi 

 (Muller) Holzapfel 23 from the Aachen beds of western Ger- 

 many shows that the European form belongs to the same 

 genus as the American forms and it seems advisable to pro- 

 pose a new genus for this group. Hemifusus is another 

 genus that occurs among the Coon Creek Buccinidae and is 

 a form which has never before been reported from the Cre- 

 taceous of Eastern United States. 



In the family Nyctilochidae there is a single genus Tri- 

 tonium. The family Columbellariidae is represented by a 



22 Harris, G. D., Bull. Amer. Pal, 1896, vol. i, no. 4, p. 96, pi. 9, 

 fig. 13. 



23 Holzapfel, E. Pelaeontographica, 1888, Band xxxiv, pag. 106, 

 Taf. xi, figs. 4-7. 



