352 



PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Patella Pottsi, Hutton : Cat. Mar. Moll. N. Zeal., p. 44 (1873) 

 Helcioniscus redimiculum, Pilsbry : Man. Conch, (1), vol. xiii, p. 136. 



This species, nearly allied to H. denticulatus and H. strigilis, is very 

 variable ; the dentition is very much like that of the first species, but 

 the shell characters are more in accordance with the latter. The form 

 varies from round-oval to elongate-oval, depressed to conical, and the 

 apex is to be found situated from the front fourth to quite close to the 

 anterior margin. Sometimes the shells are beautifully coloured, the 

 ribs brown and the intervals bluish white, whilst other specimens 

 have the surface very much worn and eroded. Interior: The central 

 area is normally cream white to light brown, but at the Chatham and 

 Auckland Islands shells occur with the central area light blue to 

 bluish grey and brown, like H. limhatm, Phil., from Tasmania. 



Rah. — it is found on the eastern sliorcs of the South Island from 

 Stonyhurst to Preservation Inlet, and at the Chatham, Bounty, and 

 Auckland Islands. 



8. Helcioniscus craticulatus, n.sp. 



Shell small, thin, ovate, depressed conical, the apex at the anterior 

 third of length, anterior slope straight, posterior very slightly convex. 

 Surface black, brown, or yellowish grey ; black shells sometimes 



with concentric patches of grey ; sculptured by 24 to 30 principal 

 radiate ribs, the interstices having 1 to 3 smaller riblets, and they are 

 crossed by very distinct, close- set concentric strise, producing a finely 

 granulated surface. The radiate ribs are alternately black and olive 

 or black and reddish white, sometimes the black rays are quite absent, 

 and the shell is uniformly flesh-coloured. Margin slightly crenulated. 

 The interior is olive or white, tinged with orange outside the muscular 

 scar, iridescent, and the black rays are distinctly visible through the 

 pearly layer. The central area is chestnut brown. 



The dimensions of a few specimens are : — 



Length 25, breadth 20, height 7 mm. (Type-specimen.) 

 „ 20, „ 17, „ 5 mm. 

 ,, 19, ,, 15, ,, 4"5mm. 



The animal and dentition are unknown. 



Hah. — Kermadec Islands. Specimens were collected by Captain 

 BoUons, of the Government steamer " Hinemoa," and kindly presented 

 to me. Type in my collection. 



