135 



This species is closely related to V. strojyhodon, but the whorls 

 are convex, without costse, with sharp-edged tubercles at the 

 angle. Tenison Woods compares it to V. dej)ressa, Lamk., from 

 which it differs by the same characters which separate the Aus- 

 tralian species from' their European analogues. 



Dimensions. — Length, 46 ; breadth, 22. 



Localities. — Table Cape (Hobart Mus. !) ; lower beds at Muddy 

 Creek ; River Murray ClilFs near Morgan. 



Gexus Mitra. 

 synopsis of species. 

 Shell mi triform, striate or spirally grooved. [Eu-Mitra.] 

 Spirally grooved and punctured. 



Spire elongated ; grooves, 6 ; plaits, 5. 



1. 21. alokiza. 

 Spire conically fusiform ; plaits, 4. 



2. M. Dennanti. 

 Finely longitudinally striate, and more or less reticulate. 



Spire elongated, narrow ; 1 large, 2 small plaits. 



3. M, dictua. 

 Shell broader ; 1 columella plait. 4. M. imiplica. 

 Fusiformly-conic ; body whorl varicosely thickened ; 



4 plaits. 5. M. varicosa. 



Shell somewhat columbelliform, smooth. [Strigatella.] 

 Shell broad; outer lip crenate; 4 plaits. 



6. M. atyjjJia. 

 Shell narrower ; outer lip smooth ; 4 plaits. 



7. M. com2:)lanata. 

 An ante-sutural rib ; outer lip lirate ; 5 plaits. 



8. M. ligata. 

 Shell fusiform, spirally ridged and transversely striate. 



[Cancilla.] 



Aperture two-thirds the total length of shell, pullus small. 



9. M. othone. 

 Aperture nearly one-half; pullus large. 



10. M. atractoides. 

 Shell fusiform, spirally and transversely ribbed ; aperture with 



a callosity at the posterior angle. [Zierliana.] 



11. M. escharoides. 

 Shell fusiform, costated, abruptly contracted to a beak. 



[COSTELLARIA.] 



Whorls convex or flat. 



Spiral threads many. 12. M. leptcdea. 



Spiral ribs few, granulose ; spire somewhat scalar. 



13. M. euglypha. 

 No spiral ornament. 14. M. exilis. 



