2IO JOURNAL OF CONCHOLOGY. 



DESCRIPTIONS OF SOME NEW TASMANIAN 

 HELICES. 



By W. F. PETTERD. 



(From a Paper read before the Royal Society of Tasi7tania, 12th Nov., i8j8.) 



1. Helix Dyeri, n. sp. 



Shell small, imperforate, depressedly discoid, thin, very 

 highly polished, finely irregularly striated with lines of growth 

 above and below, glassy yellow with irregular more or less 

 distant rays of reddish-chestnut ; spire depressed, small ; 

 whorls 3}^, flatly slanting outwards, last much distended, not 

 descending in front, suture faintly impressed; aperture 

 lunately-ovate, margins faintly approaching, joined by a rather 

 thick deposit of callus, columellar margin dilated, entirely 

 covering the perforation, 



Diam,, greatest 3^, least 2^ ; height i^^ mil. 

 Habitat — In the thick mass of vegetation growing on the 

 banks of Distillery Creek, near Launceston. 



Under the lens a very pretty glossy species, that cannot 

 possibly be mistaken for any other Tasmanian species. Its 

 nearest 2i\\Qy\s Helix Nelsonensis Brazier, from which it differs in 

 being imperforate and is more often rayed with chestnut 

 markings. Like the great majority of land shells it is a moist- 

 loving species. Extremely rare and difficult to find. 



2. H. Roblini, n. sp. 



Shell small, deeply and narrowly unbilicate, discoid, 

 white, finely, closely and regularly striated above and below, 

 strise abruptly terminating at the apical whorls {i]4. to 2), 

 which are distinctly spirally striate, with thread-like strise ; 

 spire flat; whorls 4^ slowly increasing in size, last rounded ; 



Q.J.C, ii., July, 1879 



