SuTER. — On.N.Z. Land and Fresh-ivatcr Shells. 223 



well developed, the inner one with two or three sharp points, 

 the second high, in the shape of a sharp tooth. The plaits on 

 the parietal wall are rather stout, elevated, not very long, and 

 regularly distributed. Umbilicus broad, deep, perspective, 

 nearly one-third of the diameter. 



Diameter, 0-09in. (2-25mm.) ; height, 0-04in. to 0-05in. 

 (1mm. to l-25mm.). 



Hah. Under rotten bark. The most common of the group. 

 North Island : Forty-mile Bush ; Hast well. (H. S.) 



Named in honour of Sir James Hector, to whom I am 

 greatly indebted for assistance in my studies of natural 

 history. 



Helix microundidata, n. sp. Plate XIV., fig. 4, a-d. 



Shell depressed, very small, pale horny, with neat brown 

 streaks which are sometimes shai'ply undulating, otherwhiles 

 forming zigzag lines, but varying in breadth ; faintly shining, 

 fragile, with very close ribs. Eibs bent a little forwards on the 

 surface, then going straight downward — 60 in the tenth of aii 

 inch (25 per mm.). Spire very little elevated, nearly flat; 

 apex bare. Whorls 5, slowly increasing, rounded, the last not 

 descending. Suture impressed. Aperture slightly oblique, 

 rotundly lunar, more excavated in the upper part by the 

 penultimate whorl. Peristome straight, acute, margins not 

 convergent, regularly arched, columellar margin descending. 

 Aperture with 13 laminae — 1 on the penultimate whorl, 2 on 

 the columella, and 10 on the parietal wall. The plait on the 

 penultimate whorl is central, high, but rather thin, forked at 

 the top by a deep and large groove. The two laminaj on the 

 columella are stout, with large base, and both tongue-shaped. 

 The plaits on the parietal wall are fine, long, regularly dis- 

 tributed. Umbilicus deep, broad, nearly one-third of the 

 diameter. 



Diameter, 0-07in. (l-75mm.) ; height, 0-04in. (1mm.). 



Hab. Under rotten wood and bark in the bush. Very rare. 

 North Island : Forty-mile Bush ; Hastwell. (H. S.) Middle 

 Island : Greymouth. Found one specimen amongst Helix 

 leioda, Hutt., sent to me by Mr. R. Helms. 



Helix aorangi, n. sp. Plate XIV., fig. 5, a-c. 



Shell small, depressed, globular, yellowish-white, with 

 somewhat irregular chestnut zigzag or sinuated streaks, 

 faintly shining, thin, transparent. With well-developed ribs, 

 nearly straight, about 38 in the tenth of an inch (15 

 per mm.). Whorls 5^ to 5, slowly increasing, rounded. Suture 

 impressed. Aperture slightly oblique, rotundly lunar, regu- 

 larly excavated by the penultimate whorl. The last whorl 

 not descending. Aperture straight, acute, margins slightly 



