62 PROVISIONAL AID TO THE STUDY OP TASMANIA^ MOLLUSOA 



Small, columella plaited or toothed, spire 

 short 

 **Spire very short. 



Aperture with a recurved canal 



Shell inversely conical 



*** Spire none. 



Oval, aperture narrow 



Shell cylindrical, small 



Small, white, pellucid, last whorl ex- 

 panded 



Moderate or large, inflated 



Like BulUdce, shell thin, flexible 



(c.) Shell turreted, elongate or subulate. 



Outer lip indented near the suture, canal 

 long and straight 



Shell elongated, polished, richly coloured, 

 shelly operculum 



Whorls ribbed, sutures deep 



Aperture channeled in front, subulate 



Aperture with an oblique notch in front 



Shell awl- shaped, spirally striate, aper- 

 ture rounded 



Very small, milk white, polished 



Very small, slender, many whorled, 

 whorls plaited 



Very small, aperture oavte, columella 

 truncate 



Very minute, elongate, whorls flattish, 

 covered with brownish epidermis 



Very small, aperture entire, often um- 

 bilicated, columella smooth 



(d.) Shell globular or turbinated 



Polished, aperature semi-circular Naticidse,xxiii. 



Aperture semi-circular, columella flat 



Shell thin, blue 



Aperture rounded, not pearly inside 



Aperture rounded, pearly inside, oper- 

 culum horny 



Like Trochidse, but with shelly opercu- 

 lum 



(e.) Shell conical, with a flat 



Shell not pearly inside, umbilicated Solariidse xxv. 



Shell not pearly inside, not umbilicated Littorinidse,xxxii. 



Shell pearly inside, lip without slit Trochidse, xlv. 



Shell pearly inside, lip perforated, or 



with a slit Pleurotomariidee, xlvii. 



Base with a half cup shaped shelf or 



plate, apex sub-central Calyptrteidse, xxiv. 



Auriculidse, lxiv. 



Cassididte,xxii. 

 Conidse, xx. 



Cyprseidae, xxi. 

 Cylichnidse, liv. 



Philinidae, lii. 

 Bullida3, lv. 

 Lophocercidffi, lvi. 



Pleurotomidse, xix. 



Phasianellidaj, xliii. 

 Scalaridaa, xxvi. 

 Cerithiidse, xxxiv. 

 Terebridse, xviii. 



Turritellidfe, xxviii. 

 Eulimidse, xxx. 



Turbonillidse, xxxi. 



Planaxidse, xxxiiL 



Eissoeliidse, xxxv. 

 Part 

 Rissoidse, xxxvi. 



Neritidse, xl. 

 Ianthinidse, xxvii. 

 Littorinidos, xxxii. 



Trochidse, xlv. 



Turbinidse, xliv. 



^ 



