48 FASOIOLARlINiE, ETC. 



smooth. Dentition, pi. 25. iig. 4. The type of this gemi« is a mioceue 

 fossil. B. parilis C'onr. (PI. 28, tig. 40j: the recent species is i?oreo- 

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

 a synonym. 



Siili-Family FASCIOLARIIN^. 



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

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

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

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



8ul)-Fnmih PTY("HATKA('T1.\ .K. 



PrYCUATRACTUS, Stimpson. Shell fusiform, spirally striated; 

 aperture with a moderate canal ; columella i)licated as in Faseiolaria, 

 Dentition, pi. 25, fig. 5. 



MEYEKIA, Dunker and JNletzger. Shell elongate fusiform, longitu- 

 dinally obtusely plicate ; spire produced ; canal exserted ; columella 

 obscurely plicate. Operculum irregidarly ovate ; apex obtuse ; 

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



Sub-Family PERISTERNIIN^. 



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 

 coh\mella folds and recurved canal are the principal (and not sufficient) 

 distinctions from Latirus. 



LATIRUS, ]\Iontf. Shell turreted, fusiform, sometimes umbilicated ; 

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

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

 plaits in front. ^Ir. 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 ; oftter lip sub-acute, with a more or less promi- 

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

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



