1 02 BUCCINID^E. 



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

 accuminated, whorls longitudinally ribbed 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, fig. 34. 



CYLLENE, Gray. Shell ovate ; spire short, acute, suture canaliculated; 

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

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

 Operculum with terminal nucleus. Dentition unknown. 



Fossil Genera and Subgenera. 

 Sub-Family MELONGENIN^E. 



Genus BULBIFUSUS, Conrad. Not characterized. 



B. INAUKATUS, Conr.* (=Fusus FITTONII, Lea), PI. 29, 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. Griynon. 



A comparison of numerous specimens indicates the very close relation- 

 ship of Bulbifusus, Conr., with this genus, which is itself entirely too close 

 to the recent group Volema. Bayle has changed the name to Sycum, be- 

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

 in such changes, which would completely unsettle our nomenclature. 



Sub-Family NEPTUNIINJ3. 



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

 less elevated, with rounded volutions ; aperture 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 Green 



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

 ton and Hudson River groups. 



* In describing the fossil genera of Conrad I quote his specific names 

 for the types specified by him. I have indicated, however, the equivalent 

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

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



