HELIX-CHAROPA. 105 



height. Apex smooth, white, shining. Whorls 4i, the inner ones 

 narrow, the last largely developed, occupying two-thirds of the 

 diameter, not descending, on the inner side rapidly ascending, 

 regularly arcuated to the periphery. Suture very deep. Aperture 

 lunar, narrow, vertical, much excavated by the penultimate whorl. 

 Peristome straight, acute; upper margin narrowly, lower more 

 broadly arcuated; columellar margin vertically descending, margins 

 convergent. Penultimate whorl smooth, white, rather callous. Um- 

 bilicus broad, deep, perspective, about one-third of the diameter. 



Alt. 1-5, diam. 2'7 mill, (Sut.) 



Hastwell, Forty-mile Bush, North Island, New Zealand. 



Diplomphalus huttoni SUT., Tr. N. Z. List, xxii, p. 226, t. 15, f. 



11, a, b (shell). Patula huttoni SUT., 1. c. xxiv, p. 273. 



P. MOUSSONI Suter. PI. 19, figs. 46, 47, 48. 



Shell small, discoidal, white, banded with brown, the streaks fol- 

 lowing the direction of the ribs at irregular distances, faintly shin- 

 ing, thin, transparent, strongly ribbed ; ribs sharp, directed for- 

 wards and arcuated on the surface, slightly undulating on the 

 periphery, straight below, about 18 ribs in the tenth of an inch (7 

 per mm.). Spire concave to about one-quarter of the height. 

 Apex smooth, shining. Whorls 4, the first 3 very narrow, the last 

 large, -two-thirds of the diameter, not descending, on the inner side 

 rapidly ascending, regularly arcuated outside. Suture very deep. 

 Aperture vertical, lunar, excavated by the penultimate whorl. 

 Peristome straight, acute, lower margin regularly arcuated, the 

 upper margin forming a much narrower arch ; columellar margin 

 descending nearly vertically, not reflected ; margins convergent. 

 Penultimate whorl smooth, white, somewhat callous to a short dis- 

 tance outside the aperture. Umbilicus broad, perspective, about 

 one-quarter of the diameter. Alt. 2, diam. 4 mill. 



Hastwell, Forty-mile Bush, North Island, New Zealand. 



Diplomphalus moussoni SUT., Tr. N. Z. Inst. xxii, p. 227, t. 15, f. 



12, a, b (shell). Patula moussoni SUT., I. c.. xxiv, p. 273. 



(2. Species oj Lord Howe Island.) 



P. WILKINSONI Brazier. PI. 19, figs. 49, 50. 



Shell small, discoidal, obtusely carinated, thin, translucent, color 

 pale yellow alternating with red radiating dashes; whorls 4, con- 

 vex slowly increasing; sculpture fine regular microscopic costai 



