BY E. M. JOHNSTON, F.L.S. 



79 



(xvi.) Fftmily CoLUMBELLIDiE. 



Genus Coltjmbella. Lam. (102-113. 

 Shell strombiform, mi triform, or fusiform (usually fusiform, 

 with elevated spire in Tasmanian species), smooth, or 

 longitudinally or. transversely ribbed; internal lip 

 excavated in middle, erenulate or denticulate in front; 

 outer lip inflected and internally thickened and crenulate 

 in the middle. Bist.— Mostly sub-tropical. (Oat shell.) 



(xvii.) Family Cancellaeimi. 

 Genus Cancellaeia. Lam. (114-117.) 



Shell ovately fusiform, cancellated, reticulated or ribbed ; 

 last whorl ventricose ; aperture oblong, canaliculate in 

 front; canal short, sometimes recurved ; columella with 

 several large oblique plications ; operculum wanting, 

 j)l s t. — World-wide ; range, low water to 40 fathoms 

 (vegetable feeders). 



(xviii.) Family Terebeim;. (Auger Shells.) 

 Genus Teeebea. Lam. (118-123.) 

 Shell elongate, na,rrow, turriculate, solid; whorls flattish, 

 numerous, with superficially impressed sutures; aperture 

 small, ovate. Profoundly notched at the base ; columella 

 oblique ; operculum annular, horny, with apical 

 nucleus. Bist. — Mostly tropical. 



(xix.) Family Pleueotomid^;. 

 Genus Pleurotoma. Lam. (124-152.) 

 Shell turriculated, fusiform, terminated anteriorly by a straight 

 canal, more or less prolonged; apeature generally 

 linear-ovate ; columella smooth, straight, or sinuous ; 

 outer lip somewhat sinuous, with a notch or slit near the 

 suture ; operculum corneous, annular, not always 

 present. Bist. — World-wide; low water to 100 

 fathoms. 



Sub-Genus Deillia. Gray. 

 Turriculated ; aperture oval, oblique, about one-third the 

 length of (adult) shell ; canal short, twisted ; colu- 

 mella lip strongly callous above. 



Sub- Genus Bela. Gray. 

 Shell oval, fusiform ; spire produced ; canal short ; sinus 

 small near the suture ; columella flattened ; aperture 

 narrowly ovate, - nearly half the length of shell ; 

 operculum pointed at both ends. 



