426 



trochinj:. 



In tliis genus the axis is imperfomte, the inner lip is 

 broad and excavated, and the columella, instead of ending 

 in a prominent tooth as in Motiodonta, has only a blunt 

 tubercle at the fore part. 



Species of Trochocochlea. 



angulata, Quoy and Gaini. 

 capillacea, Phil. 

 concolor, A. Adams. 

 constricta, Macleay. 

 corrosa, A. Adams. 

 fuliginea, A. Adams. 

 gallina, Forbes. 

 lineata, Da Costa. 

 raelaleuca. Link. 

 mutabilis, Phil. 



neritoides, Born. 

 porcata, A. Adams. 

 rudis, A. Adams. 

 sanguinea, Gray. 

 subrostrata, Gray. 

 tosniata, Qtioy and Gaim. 

 turbinata, Born. 

 turbiniformis, Salis. 

 zebra, Wood. 

 zebrina, Phil. 



Sub-gen. tegula, Lesson. 



Whorls with transverse, granular ribs ; columella spirally 

 contorted, ending anteriorly in a large, obtuse, prominent tu- 

 bercle. 



pellis-serpentis, Wood. 



Genus OXYSTELE, Phihppi. 



Shell conoidal, smooth, imperforate, umbilical region 

 covered with a thin, porcellanous expansion of the colu- 

 mella; columella Hat, trenchant, gradually blending with 

 the thin outer lip. 



Eic. O. merula, Linnams, pi. 48, fig. 8. Operculum, 

 O. merula, fig. 8, a, 8, h. Shell, 0. merula, fig. 8, c. 



In this genus the neck-lappet appears, from the figure 



