48 FASCIOLARIIN^E, ETC. 



smooth. Dentition, pi. 25, fig. 4. The type of this genus is a miocene 

 fossil. B. parilis Conr. (PI. 28, fig. 40): the recent species is Boreo- 

 fusus Berniciensis, the type of a genus described by Sars, which becomes 

 a synonym. 



Sub-Family FASCIOLARIINJE. 



FASCIOLARIA, Lam, Shell fusiform ; spire acuminated ; aperture oval, 

 elongated ; canal open, moderate in length, nearly straight ; columella 

 smooth, with a few oblique plaits at the forepart ; outer lip internally 

 crenate. Dentition, pi. 25, figs. 2, 3. 



Sub-Family PTYCHATRACTIN.K 



PTYCHATRACTUS, Stimpson. Shell fusiform, spirally striated; 

 aperture with a moderate canal ; columeila plicated as in Fasciolaria. 

 Dentition, pi, 25, fig, 5. 



MEYERIA, Dunker and Metzger. Shell elongate fusiform, longitu- 

 dinally obtusely plicate ; spire produced ; canal exserted ; columella 

 obscurely plicate. Operculum irregularly ovate ; apex obtuse ; 

 nucleus inconspicuous. Dentition, pi. 25, figs. 6, 7. 



Sub-Family PERISTERNIINJE. 



PERISTERNIA, Morch. Shell turreted, not umbilicated ; whorls longi- 

 tudinally ribbed ; aperture oval ; canal moderate and recurved ; outer 

 lip thin and crenulated ; columella with one or two slight plaits anteri- 

 orly, Dentition, pi. 25, fig. 8. The want of umbilicus, less distinct 

 columella folds and recurved canal are the principal (and not sufficient) 

 distinctions from Latirus. 



LATIRUS, Montf. Shell turreted, fusiform, sometimes umbilicated ; 

 spire produced ; whorls nodulous , aperture oval -oblong ; outer lip 

 thin, crenulated ; columella straight, with two or three small oblique 

 plaits in front. Mr. H, Crosse remarks upon the insufficiency of the 

 diagnosis of Latirus by Montfort and H, and A, Adams, and proposes 

 to relegate the species to Turbinella; that genus, however, may be more 

 advantageously restricted to the forms for which the genera Vasum and 

 Mazza have been constituted, 



LEUCOZONIA, Gray. Shell oval, subglobose, shouldered ; spire mode- 

 rate ; aperture oblong ; canal short ; columella subflexuous, with small 

 oblique, unequal plaits ; outer lip sub-acute, with a more or less promi- 

 nent tooth or tubercle at the forepart. Dentition, pi. 25, fig. 9. 

 Subgenus LAGENA, Schum . Whorls rounded above, not shouldered . 



