Shell 



76 PROVISIONAL AID TO THE STUDY OF TASMANIAN MOLLT7SCA. 



Family i x . PtrsiDiE. 



(Shell more or less spindle-shaped, without varices ; the lip 

 of aperture not thickened.) 

 Genus Fusus. Lamarck. (37-42.) 

 fusiform, not variced ; spire long, acuminate, many 

 whorled ; columella smooth, without plaits ■ aperture 

 ovate, usually striate within ; outer lip simple ; canal 

 long and straight ; operculum ovate ; acute, with apical 

 nucleus; yellowish brown; sometimes with red 

 brown strigse or spots, never branded. Dm;!.— World- 

 wide. 



Genus Fasciolama. Lamarck. (43-45.) 

 Shell fusiform; spire acuminate; aperture oval-elongate, 

 outer lip internally crenate ; columella smooth, with a 

 few oblique plaits; canal moderate, nearly straight. 

 Dist. — World-wide. 



(x.) Family Buccinid*. 

 (Columella generally without folds or plications.) 

 Genus Siphonalia. Adams. (46-48.) 

 Shell ovately fusiform, sometimes variegately coloured, thin 

 with very thin fugacious epidermis ; last whorl ventri- 

 cose, shouldered usually nodosely, plicate and spirally 

 ribbed; aperture oval; outer lip thin; columella 

 smooth ; canal rather short, twisted ; operculum ovate, 

 with apical nucleus. Dist.— Japan, California, 

 Australasia. 



Genus Canthaeus. Bolten. (49.) 

 Syn. Tritonidea. 

 Shell bucciniform, more or less ventricose in the middle, 

 narrow anteriorly ; spire and aperture nearly equal- 

 columella generally with a few transverse ridges' 

 outer lip internally crenated with a superior siphonal 

 canal ; operculum ovate, with apical nucleus. 

 Genus Pisania. Bivona. (50-51.) 

 Shell oblong, with prominent spire ; whorls smooth or spirally 

 striated; canal very short; outer lip thickened and 

 crenated ; operculum ovate, with apical nucleus Dist — 

 West Indies, Mediterranean, Philippines, Australasia. 

 Genus Cominblla. Gray. (52-59.) 

 Shell bucciniform, marked or spotted, covered with an epider- 

 mis ; spire short, acute ; last whorl large, ventricose, 



