380 Transactions. 



tion is almost constant ; in some the spatula is whitish or 

 yellowish-white or rarely spotted with black ; below is rarely 

 spotted with black. 



Measurements of a fair specimen arc : Length, 13 mm. ; 

 breadth, 9 mm ; height, 6 mm. 



Hab. — On rocks, almost at high-tide mark : Lyttelton Har- 

 bour (type) ; Taylor's Mistake Bay ; Shag Point, Otago ; Otago 

 Peninsula. 



.Type to be presented to the Canterbury Museum. Christ- 

 church. 



This species is closely allied to A. stella, Lesson, and A. stella 

 corticata, Hutton, with which species it would appear to have 

 been previously confounded. It differs from the latter in shape, 

 being elongately parallel-sided ; the ribs are lower and more 

 regular ; the margin is almost entire. It is a much thinner 

 shell, the inside coloration is fairly constant, and I have met 

 with no specimens covered with nullipores. 



I have specimens of some more AcmcBOS which I cannot 

 assign to any known species, even allowing for the variability 

 of members of this genus. These I hope to work out later on. 



Helcioniscus stelliferus (Gmelin). 



Helcioniscus stelliferus (Gmelin), Suter, Proc. Mai. Soc, vol. vi, 

 p. 350, 1905. 



Having found live young specimens of this species, I may 

 add that the live shell is, as would be naturally supposed, very 

 different in coloration from the dead shell. Living on the rocks 

 at low water, constantly exposed to heavy swells, these speci- 

 mens were very depressed, and difficult to detach. 



They are blackish on the outside, and bluish-black, irides- 

 cent, inside. Upon holding them up to the light they are 

 seen to show blood-red, as the dead shells do. 



Helcioniscus tramosericus ( Marty n). 

 Helcioniscus tramosericus (Martvn), Suter, Proc. Mai. Soc. vol. vi, 

 p. 346, 1905. 



In my list of molluscs collected in Otago I have included 

 this species with a, (?) after it. The specimens referred to were 

 collected as a variety of radians showing the coloration of tramo- 

 sericus- Owing to the hot weather, no animals were preserved. 



Upon comparing the shells with New South Wales speci- 

 mens of tramosericus it was seen that these shells could not he 

 differentiated 1'rom conchological characters alone. As my shell 

 may be either radians or tramosericus, it would tend to show 

 that unless the animals are examined New Zealand records^of 

 tramosericus must still remain doubtful. 



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