HELIX-MAORIANA. 89 



are more approached than the others. Umbilicus very narrow, 

 deep, open. Alt. 1/5, diam. 2*25 mill. (Suter.) 



Hastwell and Mauriceville, Forty-mile Bush, North I., New Zea- 

 land; under rotten wood and bark in the bush. 



Helix pseudoleioda SUTER, Tr. N. Z. I. xxii, p. 221, t. 14, f. la-c. 

 Naoriana j)seudoleioda SUT.,- 1. c. 1891, p. 298, p. 298, t. 23, f. 43, 

 44 (jaw and dentition.) 



Like P. leioda externally, but having only 12 lamellae in the 

 aperture. 



P. HECTORI Suter. PL 24, figs. 44, 45, 46, 47. 



Shell small, depressed, discoidal, light horny-brown with large 

 close brown streaks, not shining, fragile, transparent, closely ribbed, 

 ribs nearly straight, about 38 in the tenth of an inch (15 per mm.). 

 Spire nearly flat. Apex bare of epidermis, light-grey. Whorls 5, 

 very slowly but regularly increasing, rounded, the last not descend- 

 ing. Suture impressed. Aperture slightly oblique, rotundly lunar, 

 excavated by the penultimate whorl. Peristome acute, straight, 

 margins convergent. Columellar margin not reflected, descending. 

 Aperture with 14 laminae 5 on the penultimate whorl, 2 on the 

 columella and 7 on the palatal wall. On the middle of the penul- 

 timate whorl is a stout lamina, which is divided in two by a deep 

 groove, thus getting forked ; the other four smaller laminae are below 

 this one. The laminae on the columella are 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 palatal wall are rather 

 stout, elevated, not very long, and regularly distributed. Umbilicus 

 broad, deep, perspective, nearly one-third of the diameter. 



Alt. 1 to II, diam. 2} mill. (Suter.) 



Hastwell, North I., New Zealand ; under rotten bark in the bush. 



Helix hectori SUT., Tr. N. Z. I. xxii, p. 222, t. 14, f. 3a-c.Maor- 

 iana hectori SUT., 1. c. 1891, p. 299, t. 23, f. 46, 47 (jaw and denti- 

 tion.) 



P. MICROUNDULATA Suter. PL 24, figs. 52, 53, 54, 55, 56. 



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

 which are sometimes sharply undulating, or else forming zigzag 

 lines, but varying in breadth ; faintly shining, fragile with very 

 close ribs. Ribs bent a little forward on the surface, then going 

 straight downward 60 in the tenth of an inch (25 per mill.). 



