226 Transactions. — Zoology. 



Patula raricostata, n. sp. Plate XIV., fig. 9, a, h. 



Shell small, depressed, subdiscoidal, colour dark olive, not 

 shining, fragile, with distant, stout, dark-brown ribs, bent back- 

 wards on the surface and slightly undulating on the side. 

 Eibs about 12 in the tenth of an inch (5 per mm.). Spire 

 slightly elevated. Apex white, bare of epidermis. Whorls 5, 

 slowly increasing, rounded, the last not descending. Suture 

 not deep. Aperture oblique, nearly circular, but very little 

 excavated by the penultimate whorl. Margins convergent. 

 Columellar margin slightly reflected, descending vertically. 

 Lower margin strongly arcuated. Umbilicus broad, deep, 

 showing the last whorls, about one-quarter of the diameter. 



Diameter, 0-08in. (2mm.); height, 0-04in. (1mm.). 



Hab. In the mould, under dead leaves. Very scarce. The 

 shell is always covered with mud. North Island : Maurice- 

 ville. (H. S.) 



Dlplomplialus subantialba, n. sp. Plate XV., fig. 10, a, b. 



Shell small, discoidal, light-horny to white, somewhat 

 shining, fragile, transparent, very closely and finely ribbed; ribs 

 directed forwards, slightly undulating on the surface, straight 

 on the side, about 90 ribs in the tenth of an inch (35 per mm.). 

 Spire deeply concave, infundibuliform. Whorls 5 — the first 

 ones very narrow, the last very large, nearly two-thirds of the 

 diameter ; the inner whorls swollen, the last ascending rapidly 

 on the inner side,' and falling slowly arcuated to the periphery. 

 Suture very deep. Last whorl not descending. Aperture 

 lunar, small, vertical, strongly excavated by the penultimate 

 whorl. Peristome straight, acute; upper margin narrowly, the 

 lower larger arcuated. Margins convergent. Umbilicus large, 

 deep, perspective, presenting nearly the same aspect as the 

 surface. 



Diameter, 0-07in. (l-75mm.) ; height, 0-03in. (0-8mm.). 



Hab. Under rotten wood in the bush, on very damp places. 

 North Island : Forty-mile Bush ; Hastwell ; Mauriceville. 

 (H. S.) 



This shell is a good miniature of Helix antmlba. Bed- 

 done, of Tasmania, but differs from it. I do not think I am 

 wrong in placing our shell in the genus Dvplomphalus, to 

 which also belongs Pat. biconcava, Pf. 



Diplomphalns huttoni, n. sp. Plate XV., fig. 11, a, b. 



Shell small, discoidal, light-horny, with fine well-developed 

 ribs, directed forwards and arcuated on the surface, slightly 

 undulated on the periphery ; about 40 ribs in the tenth of an 

 inch (16 per mm.). Spire deeply concave, to about one-third 

 of the height. Apex smooth, white, shining. Whorls 4^, the 

 inner ones narrow, the last largely developed, occupying two- 



