18 ON SOME TERTIARY FOSSILS, 



crebris, subtillissimis ; costis subplanatis, ad angulum elegantev 

 superne rotundatis, interstitiis angustis ; lirce rotundatis, parum 

 elevatis, apice lcevi,polita ; apertur a Integra, antice et postice obtuse 

 angulata ; labro simplici, tenui ; fauce distantev liruta, labio rejlexo 

 columella biplicata, umbilico angusto, prof undo. Long 1 . 6, lat. 3^. 



Shell small, umbilicate, ovate, acute at "both ends, rising in 

 pagoda-like stages from the deep channel and constriction at the 

 suture. Whorls 5, broadly ribbed (10 on last whorl), distinctly 

 and distantly, spirally lirate, striate lengthwise, striae close, and 

 very fine. Ribs elegantly rounded at the suture so as to give a 

 coronate appearance to each whorl. The lirse are rounded and 

 not elevated, and the ribs are separated by a rather narrow 

 depression. Apex smooth and polished. Aperture entire, 

 angular at each end. Throat broadly grooved; labrum simple, 

 lip reflexed, umbilicus narrow but deep. Two plaits on the 

 columella. 



This is a very remarkable form of Cancellaria, very distinct 

 from any living form in size, and the peculiar style of its orna- 

 ment. 



Niso psila. PL 1, fig. 6. 

 Testa parva, pyramiclata, turrita, politissima ; anfr. 9, planata, 

 striis incrementl distanter insignitis et striis spiralibus, siMittissimis 

 regulariter cinctis ; ad periplieriam obtuse angulatis ; umbilico extus 

 carinato ; apertura integra, antice et postice angulata. Alt. 7, lat. 

 vix 3. 



Shell small, pyramidal, turretted, very smooth, and highly 

 polished, showing rather distantly and regularly longitudinal 

 depressed lines of growth. Eegularly and distantly, spirally, 

 striate, but in the faintest possible manner, and only visible with 

 a lens. The perrphery is obtusely angled. The umbilicus is 

 sharply keeled externally. The aperture is entire, angled above 

 and below. 



