136 



Whorls subangulated medially, without spiral ornament. 



15. M. paucicostata. 

 Shell fusiform, costated, gradually attenuated to a beak. 



Shell large, ribs curved ; an ante-sutural thread. 



1 6 . J/, terehrcvformis. 

 Shell small, with clathrate ornament. 17. M. clathurella. 



Shell fusiform, spirally ridged ; posterior whorls eostate or 

 plicate. 



Whorls with slender plic?e. 



Shell narrow, whorls regularly convex. 



18. J/, hiornata. 

 Shell broader, whorls flatted and crenulate at suture. 



19. M.suhcrenidaris. 

 Whorls with stout subtuberculose costse. 



20. 2f. citharelloides. 

 Shell fusiform, smooth or striated, not spirally ridged ; pos- 

 terior whorls eostate. [Pusic] 



Shell ovate, costa? thick. 21. J/, sordida. 



Shell narrow, cost^e angular. 22. JL semikevis. 



Shell conoidal. 



Spire short and broad, last whorl subangulated and tuber- 

 culose-costate. 23. J/, cassida. 



Spire narrower, last whorl rounded and spirally lirate. 



24. 21. conoidalis. 



SPECIES UNFIGURED AND UNCLASSED. 



Mitra anticoronata, R. M. Johnston, Proc. Roy. Soc. Tasmania 

 for 1879 [1880], p. 34. 



SPURIOUS SPECIES. 



Mitra daphnelloides, T. Woods, is transferred to Pleurotomidce. 

 Mitra coarctata, T. Woods, represents an immature example of 



MargineUa Winteri, Tate. 

 Thala marginata, T. Woods, is transferred to PJpAirotomidcp. 



1. Mitra alokiza, Tenison Woods. Plate iv., %. 8. 



Reference. — Proc. Lin. Soc, N.S. Wales, t. 3, lig. 7, p. 8, 1879. 



Shell rather thin, shining, narrowly fusiform ; spire longer than 

 the aperture, ending in a pullus of two small, narrow, rounded 

 whorls. Whorls nine, excluding the apical ones, nearly flat, 

 suture conspicuously margined anteriorly ; regularly and dis- 

 tantly spirally grooved ; grooves elegantly and closely punctated ; 

 first and second whorls slenderly costated. There are about seven 

 very narrow grooves on the penultimate whorl, whilst a very 

 slender one is interposed between the posterior one and the 

 suture. 



Last whorl subangulated in an alignment with the posterior 



