107 



ON FLAMMULINA [ALLOBISCUS] CHION, A NEW HELICOID 

 LAND-SHELL FROM NEW ZEALAND. 



By E. R. Stkes, B.A., F.Z.S., etc. 



Read lOth April, 1896. 



The species about to bo described formed part of the collection made 

 by Mr. H. B. Preston, in tbc North Island of New Zealand, and 

 is the second new species from that collection, the first having 

 already been described.' 



\ 



Flammulina (Allodiscus) cnioN, n.sp. 



Testa parva, dopresse conica, imperforata, tenuis, confertim costulata, 

 omnino nivca ; anfr. 5-5^, convexi, rcgularitcr accreseentes, ultimus 

 non descendens, costulis 82 approx. ornata, interstitise sub lente 

 striates ; basi medio impressus ; apertura rotundato-luuaris ; peri- 

 stoma simplex, tenue. Diam. maj. 5, alt. 3 mm. 



JIab. — Near Ingiewood, Taranaki, North Island. 



At first sight this species would suggest the idea that it is an 

 albino form of some kno^Yn shell : on examination, however, there 

 seems to be no known form quite resembling it ; and since it proved 

 plentiful, and no coloured specimens were found, this idea may be 

 abandoned. It is of a lovely, snowy white, and has spiral striations 

 on the apical whorls. The nearest species appears to be F. venidata 

 (Pfr.), from the South Island; from this, however, F. cliion may be 

 separated by the diifcrence in the relative proportions of breadth 

 and height, as also by the more distant and more elevated riblets. 

 The entire absence of colour is also a remarkable feature, I have 

 to thank Mr. Suter for kindly examining a sj)ecimcn and giving 

 his opinion. 



' Troc. Malac. Soc, Vol. I, p. 218, March 1895. 



