UNIVERSIT7 



MANUAL OF CONCHOLOQY 



Family NASSID^B. 



Shell ovntc, spire u-ually elongated, base oi' 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 uncini 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. 



Si/nopais of Genera. 



NORTH I A, Gray. Shell elongated, turritod, 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. 



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

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

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

 single anterior fold. Dentition unknown. 



BCLLIA, 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 BucciNANors, d'Orb. Shell with the whorls somewhat angu- 

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



Subgenus PSEDDOSTROMBDS, Klein. Shell elongated, smooth, without 

 epidermis, last whorl ventricosc ; spire acuminate; aperture o 

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

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





