468 NOTE ON CYPRJiA ANGUSTATA, VAR. 



margin of the aperture is wider and more l)ent towards the left 

 than in typical forms such as I have, by me dredged alive in 

 Hobart Harbour on Coral; it has from 20 to 22 teeth, quite white, 

 inclined forwards, blunter, and spread outwardly more over the 

 base than in the typical specimens; in the latter forms the teeth 

 are sharp pointed, projecting into the aperture, and have a rusty 

 tinge. 



On the left columellar margin there are 20 small white teeth 

 pointed directly across the aperture scarcely extended over the 

 base surface, but are seen extended down into the curved edge of 

 the columellar margin as it enters the cavity of the shell. The 

 base, unlike the typical aiu/astala, is densely porcellanous and 

 white; as a rule in the type it has a bluish tinge, whiter towards 

 the channelled ends of the aperture. 



There is an absence of the dark coloi-ations on either side of 

 the dorsal aspect of the anterior channel edges so characteristic 

 of the type forms, and this syphonal channel is not so produced 

 or notched, being obliterated by the more callous margin of this 

 form being continued directly round the ends. The dark zoned 

 specimens from the Derwent waters have many marginal spots, 

 at least 30, and although the angulated margins which separate 

 the base from the dorsal surface are decidedl}^ thickened, they do 

 not round off the chanelled ends of the aperture as in this variety. 



Hab. — Blackman's Bay, Derwent River, and Brown's River 

 beaches; Hobart Harbour, Tasmania (dredged). 



The type specimens are in my private collection. I have jire- 

 ferred to consider it only a varietal form in deference to my 

 esteemed friend Mr. Ancey, who named it from specimens I sent 

 him many months ago. 



