1917.] NATURAL SCIENCES OF PHILADELPHIA. 285 



Genus BOLTENELLA n. gen. 



Etymology: Name given in honor of Bolten who appUed the name 

 Busycon to the type genus of this family. 



Type: BoUenella excellans n. sp. 



Shell of medium size, thin, fulguroid in outline; elevation of spire 

 less than the length of the aperture and anterior canal; whorls 

 closely appressed and increasing rapidly in size; protoconch smooth 

 and paucispiral, fairly large and bulbous but not greatly inflated; 

 sculpture subdued, both axial and spiral elements present; aperture 

 pyriform; outer lip simple; parietal wall washed with callus; columella 

 reinforced near the entrance of the anterior canal; pillar slender, 

 either straight or curved. 



This new genus is proposed to include a group of forms known 

 from two species, one from Coon Creek, represented by several well 

 preserved individuals and another from the Upper Cretaceous of 

 Vaals, Germany, well illustrated and described by Holzapfel. The 

 German species, Hemifusus coronatus (Roemer) HolzapfeP^ has 

 been variously assigned by different authors since the days of Roemer 

 to such genera as Pyrula, Fusus, Rapa, Tritonidea, Tudida, and 

 lastly to Hemifusus by Holzapfel. The discovery of a related species 

 in the Ripley formation of Tennessee is further evidence of the 

 existence of a well defined group, characterized by a fulguroid outline, 

 a large, paucispiral protoconch and further by the subdued spiral 

 and axial ornamentation of the outer surface, as well as a slender 

 pillar in front of an inflated body. The fulguroid outline and fairly 

 large protoconch seem sufficient to tie the group to the family 

 Busyconidse, yet there are many features that suggest the Fusidse. 

 The genus Boltenella is probably intermediate between these two 

 families but more nearly like the Busyconidse yet not near enough 

 to true Busycon to be included in the group Protobusycon'^^ since it is 

 a much smaller form with a different type of pillar and external 

 ornamentation. Among the Fusidse it resembles Falsi fusus Grabau/^ 

 but that group is typically more slender. Its spire is elevated and 

 acuminate and the pillar is very long and straight. It is not typically 

 fulguroid in outline as is the group for which the name Boltenella is 

 proposed. 



" Holzapfel, E., 1888, Palceontographica, Bd. XXXIV, p. 105, Taf. XI, figs. 8-13. 



i*Type: P. cretaceum Wade, 1917, Am. Jour. Sci., Vol. XLIII, No. 256, 

 p. 293, figs. 1, 2. 



" Grabau, A. W., 1904, Smiths. Misc. Collections, Vol. XLIV, p. 80, 81, fig. 4. 



