214 PETTERD : ON SOME NEW TASMANIAN HELICES. 



very indistinct traces of spiral lines, brown with a bronze-like 

 lustre; spire moderately elevated; apex often corroded ; whorls 

 4)4, much rounded, last somewhat depressed; aperture 

 roundly-lunate ; peristome simple ; margins approaching, 

 joined by a thin callus, columellar margin faintly dilated. 



Diam., greatest 3, least 2; height i}( mil. 



Habitat — Cataract, near Launceston, in considerable 

 numbers on the rocks under masses of Jungermannia. It has 

 a close relation to If. sitiens Cox and H. neglecta Brazier, 

 but may be distinguished from the first by the want of the 

 regular prominent riblets and from the latter by its bronze-like 

 general aspect and by not having the segments of color so 

 persistent in that species. 



9. H. Mathinnse, n. sp. 



Shell steeply somewhat narrowly umbilicated, depressed, 

 covered with very prominent ribs, which are irregularly 

 plicately fringed, widely apart and often faintly irregular in 

 deposition and becoming almost obsolete at the apex ; shin- 

 ing, horny, almost waxy appearance; interstices and ribs 

 again striated, parallel with the ribs and also faintly trans- 

 versely, giving the irregular crenated appearance to the base 

 of the ribs ; spire depressed ; suture deep ; whorls 4 to 4^, 

 rapidly increasing, convex, last rounded, not descending in 

 front, base sculptured as upper surface and descending into 

 the deep umbilicus, which is rounded at the bottom ; inter- 

 costal spaces of base conspicuously decussate ; aperture 

 roundly-lunate ; peristome acute ; columellar margin not 

 reflected. 



Diam., greatest 6^, least 5^ ; height 2^ mil. 



Habitat — Near First-basin, Launceston, under stones. 



The most beautifully sculptured of our known Helices, 

 and one that cannot be mistaken for any other. The nearest 



J.C, ii., July, 1879 



