MANUAL OF OONCHOLOQY. 



Family NASSID^E. 



Shell ovate, spire usually elongated, base of aperture a notch 

 or short recurved canal, inner lip usually callous. Operculum 

 corneous, ovate, nucleus apical; margins plain or serrated. 

 Animal having two small processes or tails at its posterior 

 extremity. Lingual teeth arched, pectinated; the imcini with a 

 basal horn, and occasionally intermediate serrations: the denti- 

 tion is illustrated on Plate 3. 



A few fossil species are known, commencing with the Eocene. 



Synopsis of Genei'a. 



NORTHIA, Gray. Shell elongated, turrited, polished ; spire elevated, 

 acuminated, whorls depressed and sloping at their upper part ; aperture 

 shorter than the spire ; outer lip with the margin serrated. Dentition 

 unknown. 



TRTJNCARIA, Ads. and Reeve. Shell acuminately oblong, thick ; suture 

 of the spire channelled ; aperture anteriorly dilated, posteriorly sub- 

 emarginated ; columella arcuated, abruptly truncated in front, with a 

 single anterior fold. Dentition unknown. 



BULLIA, Gray. Shell ovate or turrited ; spire more or less acuminated, 

 sutures enamelled ; inner lip excavated in the middle, callous poster- 

 iorly ; aperture oval, moderate. Operculum fusiform, nucleus apical. 

 Dentition, PI. 3, fig. 20. 



Subgenus BUCCINANOPS, d'Orb. Shell with the whorls somewhat angti- 

 lated, and with a rounded or nodulous band next the sutures. 



Subgenus PSEUDOSTROMBUS, Klein. Shell elongated, smooth, without 

 epidermis, last whorl ventricose ; spire acuminate ; aperture ovate, 

 columella arched, smooth or transversely striated, outer lip thin. No 

 enamel round the sutures. Dentition, PI. 3, fig. 21. 



