GLABELLA. SW 



M. FORMICTJLA, Lam. PI. 6, figs. 2, 3. 



Yellowish white, tops of ribs and lip-margin ivory-white. 



Length, *5-'6 inch. 



So. Australia, Tasmania. 



M. muscaria, Lam. (fig. 3), is somewhat larger, the lip thicker, 

 the inner lip callous and the spire and back of the shell also 

 callously thickened, so that the ribs become obsolete or hidden, 

 but the series before me affords indubitable evidence that it is 

 merely a heavy, older state of M. formicula. Erato lactea, 

 Button, is identical. 



M. TURBINATA, Sowb. PL 7, figs-. 4, 5. 



Yellowish white, slightly plicate on the shoulder of the body- 

 whorl, plicae sometimes obsolete. Length, '35-'4 inch. 



Port Jackson, Australia. 



M. Volutiformi$i Reeve (fig. 5 , is a smooth variation of this 

 species, apparently. 



M. CYPR^OIDES, Tenison-Woods. 



White, smooth, spire hidden by the produced and thickened 

 outer lip. Length, 6 mill. 



Tasmania. 



Smaller than M. Volutiformis, and destitute of plaits on the 

 shoulder. Unfigured. I have not seen this species, and there- 

 fore cannot place it with confidence. The name was used long 

 since by Anton for a shell which has never been identified. 



M. TASMANICA, Tenison-Woods. PL 7, fig. 6. 



Translucent, milk-white, suture callous. Length, 9-10 mill. 



Tasmania. 



Is longer and narrower than M. tw binata, with a much more 

 elevated spire, and no trace of ribs. 



M. OPALINA, Stearns. PL 7, fig. 7. 



Smooth, polished, light or dark amber-colored, sometimes 

 obscurely darker banded ; lip-margin internally crenated, strongly 

 notched above. Length, 3'5-4 mill. 



Tampa Bay, Florida. 



Found on the under side of bunches of oyster-shells, near 

 low-water mark. 



