80 PBOVISIONAL AID TO THE STUDY OP TASMANIAN M0LLITSCA. 



Sub-Genus Clathueella. Carp. 

 Differs from Mangelia in the more ventricose form and more 

 evident canal ; from Glavatula in the emargination of 

 outer lip; from Bela and Baphnella in texture and 

 sculpture; shell fusiform or turriculate, cancellated 

 surface j columella lip without callosity, except a small 

 posterior tooth; no operculum; aperture nearly half 

 the length of (adult) shell. 



Sub-Genus Daphneila. Hinds. 

 Shell fusiform, thin, fragile, usually striated; aperture 

 elongated, oval, usually less than half the length of 

 (adult) shell ; canal very short. Small and elegant 

 shells, distinguished from Defrancia by their elongated 

 body-whorl tenuity and sculpture. ISTo operculum. 



Sub-G-enus Cithaea. Schum. 

 Shell fusiform, polished, longitudinally ribbed; aperture 

 linear, truncated in front, slightly notched behind; 

 outer lip margined, denticulate within: inner Up 

 frequently finely striate ; no operculum. 



Sub-G-enus Mangelia. Leach. 

 Shell fusiform, mostly longitudinally ribbed ; spire elongated 

 turriculate, accumulate; canal short, more or less' 

 truncate; columella smooth; aperture usually fully 

 half the length of shell; sinus near the suture- no 

 operculum. 



(xx.) Family Conid^e. 

 Genus Conus. Lam. (153-157.) 

 Shell thick, obconic ; whorls enrolled upon themselves • spire 

 not elevated or short, smooth or tuberculate ; aperture 

 elongate, narrow, margins parallel, truncate at base - 

 outer lip with a slight suttural sinus. Dist — 

 Principally developed in the equatorial resion 



(xxi.) Family Ctpe^eidje. 

 (Shell convolute, enamelled; spire concealed; aperture narrow 

 channeled at each end ; no operculum ) 

 Genus Cypejsa. Linn. (158-164.) 

 Shell ventricose, convolute, covered with shining enamel ; spire 

 concealed; aperture long, narrow, with short canal at 

 each end ; inner lip crenulated ; outer lip inflected and 

 crenulated. 



