24 



NOTE ON DISCOVERY OF THE HABITAT OF AMNI- 

 COLA (AMPULLABIA?) TASMANICA.—ll^^. Woods. 



With a Description of a New Species of Helix. 

 By Egbert M. Johnston, F.L.S. 



{Ueacl A^rilSth,lSn.) 



Helix Hookeriana. n.s. A. M. Jolmston. 



Shell minute, i^lanorbiform, bi-concave, somewhat oi^enly 

 perspectivelj umbilicated ; whorls 4| obliquely, arcuately 

 striate, comi3ressed, with alternate bands of red and brown ; 

 preceding whorls sunk in and closely embraced by the last, 

 the base being rather more deeply submerged, and the upper 

 surface shallower, and more openly perspective ; aperture 

 almost linear-lunate ; labrum thin, obliquely produced 

 towards periphery, and slightly inflated, forming a narrow 

 groove at the sutures ; arch of periphery faintly dilated into 

 an obsolete keel. 



Dia. — Max., 1-25 mil. ; min., 1*75 mil. ; height, 0*3 mil. 



Habitat. — Twyforth Creek, Surrey Hills, on trunks of dead 

 trees, under moss, and in the deep shade of luxuriant myrtle 

 and sassafras foliage, i.e. Fagus Cunningliami and Atherosperma 

 moscliata. Rare. 



Only four specimens of this unique little shell obtained. 

 It approaches Petterd's H. JBarrenensis in size and form, and 

 Brazier's H. neglecta in coloring and sculpture. 



Helix Otwayensis. Petterd, var. alpina. 



One specimen obtained among the collection made by 

 T. R. Atkinson and myself, in the vicinity of Surrey Hills, 

 nearly 2000 feet above sea level. It is nearly twice the size 

 of its Victorian representative, and the sculpture is "pro- 

 portionately coarser. On this account, and as it is new to 

 Tasmania, I propose Al^jina as the name of the variety. This 

 adds another to the number of species common to Victoria 

 and Tasmania, and will be interesting to those who are 

 investigating the distribution of our island fauna. 



Amnicola (Ampullarici) Tasmanica. Ten. Woods. 



I have to announce the discovery of the habitat of this 

 shell in great abundance, associated with JBithynella jjonU 

 villensis, Ten. Woods, in the Wye and other tributaries of the 

 Waratah and Arthur rivers. 



