40 A MONOGRAPH OF 



,i 



rounded, descending ; suture impressed ; aperture semi-lunar ; peristome 

 slightly thickened and reflected 3 columellar smooth. 



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



Habitat. — Gad's Hill and Mount Bischoff, found under timber. 



Closely allied to preceding, but more conical, and the granu- 

 lated striae is of a much finer texture. In form it is not unlike a 

 minute Streptaxis. 

 ». The term " flatly globose," used by Mr. Beddome, is scarcely ex- 



• pressive : the shell is globose, with a somewhat flattened base. The 

 ■callus joining the margins of the aperture is also peculiar : it is smooth, 

 shining, dark, conspicuous, arcuately produced beyond the overhanging 

 lip, and reflexed over the perforation in the shallow cavity of the base. 

 The last whorl does not descend in front in the specimens examined 

 1 by me. The nucleus, of two turns, is spirally striate. 



63.— Helix ( • ) Dyeri. N. Sp. ^ ^/(ri^mti/- u£t 



Shell small, imperforate, depressedly discoid, thin, very highly / 

 polished, finely irregularly striated with lines of growth above and be- 

 low, glassy yellow, with irregular, more or less distinct, rays of reddish 

 chestnut ; spire depressed, small ; whorls 3J, flatly slanting outwards, 

 last whorl much distended, not descending in front ; suture faintly im- 

 pressed ; aperture lunately-ovate ; margins faintly approaching, joined 

 by a rather thick deposit of callus j columellar margin dilated, entirely 

 covering the perforation. 



Diameter, greatest 3 J, least 2 J ; height, \\ mil. 



Habitat. — In the thick mass of vegetation growing on the banks of 

 Distillery Creek, near Launceston ; Corra Linn, Leven 

 Biver, North Coast (one specimen), Chudleigh, Middlesex 

 Plains, Mount Bischofi*. 



Under the lens a very pretty glossy species, that cannot possibly be 

 mistaken for any other. Its nearest ally is H. Nelsonensis, from which 

 it difiers in being imperforate, and more often rayed with chestnut mark- 

 ings. It is, like the great majority of land shells, a moist-loving species, 

 and is very rarely met with. 



I have named it in honour of my friend Mr. B. Dyer, a great lover 

 of shells. 



64. — Helix ( * ) Nelsonensis — Brazier. 



Pro. Zool. Soc, 1870, p. 664. 

 Legrand, Col. for Mon., species 44. 



H. fulgetrura — Cox. 



Legrand, Col. for Mon., sp. 31, pi. i., fig. 11. 

 Shell umbilicated, depressed, discoid, very thin, obliquely and finely 

 striated, glossy, rich tawny yellow 3 spire slightly elevated, apex obtuse ; 



