102 BUCCINIDiE. 



NASSARIA (Link), H. and A. Adams. Shell ovately fusiform ; spire 

 acciiminated, whorls longitudinally rihhed and cancellated ; aperture 

 ending anteriorly in a long recurved canal ; inner lip thin, circum- 

 scribed, transversely corrugately plicated ; outer lip grooved internally. 

 Operculum ovate, nucleus apical. Dentition, PI. 27, tig. 34. 



CYLLENE, Gray. Shell ovate ; spire short, acute, suture canal iculated; 

 columella concave, smooth or finely grooved ; outer lip with a slight 

 sinus at the fore-part, eniarginate posteriorly, grooved internally. 

 Operculum with terminal nucleus. Dentition unknown. 



Fossil Genera and Subgenera. 

 Sub-Family MELONGENIN^. 



Genus BUTiBIFUSUS, Conrad . Not characterized. 



B. INAURATUS, Conr.* (=Fusus FiTTONii, Lea), PI. 20, fig. 55. Eocene, 

 Claiborne, Ala . 



Genus CORNULINA, Conr. Not charactized. 



C. ARMIGERA, Conr. (= Fusus Taitii, Lea) . PI. 29, fig. 56. Eocene, 

 Ala. 



Genus LEIOSTOMA, Swains. Fusiform, ventricose in the middle, 

 entirely smooth, almost polished ; inner lip thickened and vitreous ; base 

 of the pillar very straight. 



L. BULBiFORMis, Lam. PI. 29, fig. 57. Orignon.. 



A comparison of numerous specimens indicates the very close relation- 

 ship of Jiidbifusns, Conr., with tliis geims, which is itself entirely too close 

 to the recent group Volcma. Bayle has changed the name to Si/cui/i'. be- 

 cause Leiostoma is preoccupied by Lacepede in Fishes. I cannot concur 

 in such changes, which would completely unsettle our nomenclature. 



Sub-Family NEPTUNIINJi]. 



Genus FUSISPIRA, Hall. Shell fusiform, imperforate, spire more or 

 less elevated, with rounded volutions ; apertui'e elongate, oval or elliptical, 

 produced below, forming a sub-rimate canal ; columella slightly twisted, 

 without folds, peristome sharp. Surface smooth. 



F. vENTRicosA, Hall. PI. 29, fig. 58. Trenton Limestone, near Oreen 

 Buy. 



So far as known, this palajozoic genus is confined to the Quebec, Tren- 

 ton and Hudson River grovips. 



* In describing the fossil genera of Gonrad I <iuotc his specific names 

 for the types specified by him. I have indicated, liowever, the ei|ulvalent 

 species of Dr. Lea in brackets. The decision of (questions of priority of 

 publication of fossil sjiecies does not fall within the scope of this work. 



