756 GASTROPODA. \Pulmonata. 



rounded, funicular around the umbilicus. Suture impressed. Aper- 

 ture somewhat oblique, rotundly lunate. Peristome thin, straight, 

 the margins approximating. Outer lip subangled. Columella vertical, 

 slightly arcuate. The inner Up slightly expanded. Umbilicus narrow. 

 open, deep, about one-ninth of the greatest diameter. 



Diameter Ma]., 2-5 mm. ; min., 2-25 mm. : height. 2-25 mm. 



Dentition. Suter, T.N.Z.I., xxiii, 92, pi. 18, f. S, T. 



Type in the Canterbury Museum, Christchurch. 



Hob. North Island : Wanganui, type (T. W. Kirk) ; Whangarei ; 

 Chicken Island (C. Cooper) ; Holdanga ; Waitakerei Range ; Hunua 

 Range ; Tarukenga ; Waimarama ; Seventy-mile Bush ; Wade ; 

 Mount Pirongia. South Island : Kenepuru ; Nelson ; Stony hurst ; 

 Hooker Valley ; The Nuggets, Port Molyneux. 



Var. major, Suter, P. Mai. S., ii. 1897, 259. 



Differs from the species principally in the much larger size, the 

 diameter being 3-5 mm. The epidermis is almost smooth, but the 

 rather distinct radiate riblets are clearly visible near the suture, only 

 rarely extending thread-like over the surface of the whorl to the peri- 

 phery. The colour is darker than in most examples of the species. 



Type in niy collection. 



Hob. Half-moon Bay, Stewart Island (A. Hamilton). 



29. Laoma regularis, Pfeiffer, 1855. Plate 30, fig. 3. 



Helix rcr/ularis, Pfr., P.Z.S., 1854 (1855), 50 ; Conch. Icon., vii, pi. 182, 

 f. 1259 ; M.H. Viv., iv, 33 ; Hector, Cat. Land Moll. N.Z., 7 ; M.N.Z.M., 

 17 ; Man. Conch. (2), iii, 37, pi. 21, f. 12. Nanina (Thalassia) regularis, 

 Pfr., Nomencl. Hel. Viv., 47. Phrixtjnathus regularis, Pfr. : Hutton, 

 T.N.Z.I., xvi, 197. Laoma (Phrixgnathus) reyttlaris, Pfr. : Hedley and 

 Suter, P.L.S. N.S.W. (2), vii, 648 ; Suter, J. de Conch., xli, 277. 



Shell small, regularly coniform, perforate, thin, pellucid, viscously 

 glossy, with membranous radial riblets and processes at suture and 

 keel of periphery. Sculpture : Post-nuclear whorls with distant 

 oblique membranous riblets, about 2 per millimetre, which are pro- 

 duced into spoon-shaped horny processes at the suture and keel of 

 the last whorl ; interstices with very fine growth-striae, crossed by 

 spiral lines which are distinct on the base only. Colour luteous-horny. 

 Spire high, conic, rather acute, about three times the height of the 

 aperture ; outlines almost straight. Protoconch convex, of 2 smooth 

 volutions. Whorls 6 to 8, flattish, slowly increasing, the last with a 

 subacute keel ; base flat. Suture not much impressed. Aperture 

 depressed, subangularly lunate. Perislnme simple, straight, margins 

 remote, sharply angled where outer and basal lip meet. Columella 

 verv short, arcuate. Inner lip thin, dilated above. Perforation 

 narrow, about one-tenth of the greatest diameter, deep, usually quite 

 open- 



