26 



POMATIOPSIS BaDGERENSIS. 11. S. 



Shell pyramidal, generally decollate, tliin, scarcely opaque, 

 pale fleshy white, inside tinted reddish brown ; whorls, prior 

 to being decollated, -usually 7, subsequently average 5 ; 

 decussate with irregularly raised lirae, and indistinct varices ; 

 suture deeply impressed, aperture roundly ovate, peristome 

 continuous, margin somewhat thickmied, inflated, and re- 

 jected ; inner lip conspicuously reflected. Long. 10, lat. 

 3J — 4. Fossil, Badger Island. A much larger shell, and 

 very distinct from P. striatula. Menke. 



Planoebis atkinsoni. n. s. 



Shell minute, irregularly flatly discoid, with an open 

 shallow umbilicus, and sunken nucleus ; whorls 4, angled, 

 rapidly increasing, depressed ; preceding whorls embraced, 

 and slightly sunk in the last ; last whorl flattened irregularly 

 above, slightly convex below ; somewhat obsoletely keeled 

 above at abrupt expansion near suture, and constricted and 

 sharply keeled at periphery ; surface finely, obliquely arcu- 

 ately striate ; aperture nearly two-thirds of the breadth of 

 shell, obliquely and narrowly cordate-acuminate, with channel 

 formed by the sharply keeled j^eriphery, and two grooves 

 anteriorly and posteriorly formed by the projecting keel of 

 preceding whorl ; margins simple, ap2:>roaching, and obhquely 

 connected by a more or less distinct callus ; upper margin 

 obliquely produced. Diam., max. -5, min. 3|, alt. 1. Habitat, 

 common on leaves of Triglochin, South Esk, from Avoca to 

 Launceston. 



This shell is very distinct from P. tasmanicus (Woods), 

 the whorls of which are not flattened above, although there 

 is in most specimens from Circular Head a slight approach 

 to a keel. It seems to a^pproach J./iisws hermatoides (D'Orb.) ; 

 the concave flattened sides are, however, reversed in the 

 Tasmanian species. Dedicated to Mr. T. R. Atkinson, of 

 Launceston, an enthusiastic conchologist. 



Planorbis scottiana. n. s. 



Shell discoidal, very minute, thin, pale horny, somewhat 

 flattened above and below ; whorls 4, depressedly rounded, 

 finely transversely striated, regularly increasing ; suture 

 moderately sunk ; aperture obliquely raised, roundly lunate ; 

 peristome simple. Diam., max. 2 J mil., min. 2 mil., height 

 ■| mil. Habitat, restricted to the same isolated lagoon in which 

 Gundlachia petterdi is found. It differs grepttly from P. tas- 

 mcmica and P. atJcinsoni in size and form. 



I have dedicated this species to the memory of the late 

 Hon. J. R. Scott, who was an enthusiastic naturalist, and 

 did much for the natural history of Tasmania. 



