750 GASTROPODA. [Pulmonata.. 



convex. Columella short, arcuate. Inner li/j reflexed above. Um- 

 hilicus quite open, narrow, pervious. 



Diameter, 2-2 mm. ; height, 1-7 mm. 



Animal unknown. 



Type in the Canterbury Museum, Christchurch. 



Hob. Campbell Island, mostly on Dracophyllum, apparently not 

 common, or perhaps easily overlooked (W. K. Chambers). 



18. Laoma compressa, Suter, 1909. Plate 29, fig. 19. 



Laoma (Phrixgnathus) compressa, Sut., P. Mai. S., viii, 1909, 261, pi. 11, f. 24. 



Shell minute, depressed, perforated, yellowish-white, thin and 

 shining, smooth. Sculpture of the post-embryonic whorls consisting 

 of fine growth-lines, and microscopic very fine spiral strise, more dis- 

 tinct upon the base. Colour uniformly yellowish-white. Spire low, 

 lightly convex, its height about half that of the aperture. Proto- 

 conch convex, smooth. Whorls 4, regularly increasing, convex, peri- 

 phery subangled ; base* convex. Suture simple, impressed. Aperture 

 lunate. Peristome thin and sharp. Columella short, arcuate. Inner 

 lip somewhat reflexed above. Perforation rather narrow, quite open, 

 deep, about one-tenth of the greatest diameter. 



Diameter, 1-4 mm. ; height. 1-25 mm. 



Animal unknown. 



Type in my collection. 



Hob. Birkenhead, near Auckland (A. Suter). 



The only specimen I have is very likely not quite adult. 



19. Laoma Erigone, Gray, 1850. Plate 29, fig. 20. 



Nanina Erigone, Gray, P.Z.S., 1849 (1850), 165. Helix Erigone, Gray, 

 A.M.N.H. (2), vii, 65; M.H. Viv., iii, 60; Conch. Icon., vii, pi. 133, 

 f. 817 ; Hector, Cat. Land Moll. N.Z., 7 ; M.N.Z.M., 18. Nanina 

 (Thalnssia) Erigone, Gray : Nomencl. Hel. Viv., 47. Phrixgnathus 

 Krigone, Gray: Button, T.N.Z.I., xvi, 197. Helix (Phrixgnathus) Eri- 

 gone, GT&y,WLa,n. Conch. (2), iii, 37, pi. 21, f. 13. Laoma (Phrixgnathus) 

 Erigone, Gray : Hedley and Suter, P.L.S. N.S.W. (2), vii, 648 ; Suter, 

 J. cle Conch!, xli, 276. Helix Heldiana, Pfeiffer, P.Z.S., 1852 (1854), 

 148 ; M.H. Viv., iii, 60 ; Hector, Cat. Land Moll. N.Z., 8. Nanina 

 (Thalfis-^a) Heldiana, Pfr., Nomencl. Hel. Viv., 47. Helix Heldiana, Pfr. : 

 M.N.Z.M., 17. 



Shell minute, turbinate, perforated, thin, almost smooth, periphery 

 angled. Sculpture of the post-nuclear whorls consisting of fine oblique 

 growth-lines, but the last whorl is mostly rib-striate, having about 

 10 riblets per millimetre ; microscopic fine spiral lines are sometimes, 

 though not always, present, more distinctly visible on the base. 

 7 ''ilour light-horny, with broad equidistant radial bands of fulvous, 

 not extending over the base. Epi'iirniis thin, translucent, slightly 

 shining. Spire conic, rather acute, its height about 2| times that of 

 the aperture. Protoconch globose, of 1 smooth and flatly convex 

 turns. Whorls 6 to 7, slightly convex ; periphery distinctly angled. 



