32 A MONOGRAPH OP 



5, flatly slanting from the centre to the suture above and below, giving 

 a crenated appearance at the periphery of each whorl, last not descending 

 in front ; peristome simple ; aperture almost round j columellar margin 

 not dilated. 



Variety a. — Pure white, without markings. 



Habitat. — Mount Wellington, Brown's Kiver, Snug Kiver, Laun- 

 ceston, Chudleigh, Mount Bischoff, near Valentine's Peak. 



Somewhat resembling the preceding, but flatter, and with a wider 

 umbilicus ; the riblets are also much mere compact and close. H. 

 Stanleyensis (mihi) may be but a larger and more coarsely sculj)tured 

 vari'ety, but I have not met with intermediate forms. The embryonal 

 whorls are smooth or with very fine spiral threads. A pure white 

 variety is occasionally met with ; this Dr. Cox has named H. 

 Kingstonensis. I have examined the type specimen in the Museum 

 of the Royal Society of Tasmania, and fail to discern any difierence 

 from the usual form, except colouration, although the figures in 

 Legrand's book represent a totally different shell ; there it is shown 

 with much more coarse strise, the umbilicus angled at its opening, and 

 the aperture of a different form. The figures are more like JE[, 

 (wchitectonica (Brazier). 



49. — Helix ( ) — Taylor. 



Quarterly Jour. Con., 1879. 

 H. Stanleyensis — mihi, N. Sp. 



Shell with an open umbilicus, in which the whorls are freely 

 exposed, broadly-discoidal ; yellowish, occasionally white, marked very 

 irregularly with dashes and waved streaks of reddish-chestnut, marking 

 often quite absent ; spire very faintly elevated, finely, rather closely 

 striated with waved riblets above and below, interstices under the lens 

 decussate, extending over the riblets ; whorls 4 J, prominently rounded, 

 last scarcely descending in front ; peristome acute j aperture almost 

 round ; margins closely approaching, not dilated. 



Diameter, greatest 6, least 5 ; height, 2 J mil. 



Variety a. — White, without markings. 



Habitat. — Circular Head, Table Cape, Emu Bay, Torquay, Laun- 

 ceston. Mount Wellington, islands in Bass Straits, and 

 Fernshaw (Victoria). 



A very pretty species, having a close resemblance to H. MacDonaldi 

 and a remote one to H. Tasmanice and H. Tamarensis. To the former it is 

 so closely allied that it may be but a large variety j from the two latter it 

 may be distinguished by attending to the diagnosis. At Circular Head 



