Laoma.] GASTROPODA. 753 



23. Laoma Hamiltoni, Suter, 1896. Plate 10, figs. 11, Ma, 116. 

 Laoma (Phrixgnathus) Hamilton/', SHUT, P. Mai. S., ii, 1896, 37, pi. 4, f. 22-24. 



Shell minute, subdiscoidal, narrowly umbilicated, corneous, glossy, 

 pellucid, smooth. Sculpture : The protoconch is microscopically spir- 

 ally lirate, but the following whorls have only distinct growth-lines. 

 Colour uniformly yellowish-horny. Spire but little elevated. Proto- 

 conch of 1J whorls, flatly convex. Whorls 3|, slowly and regularly 

 increasing, convex ; periphery and base rounded. Suture much 

 impressed. Aperture oblique, rotundly lunate. Peristome straight, 

 acute, regularly rounded. Columella short, vertical. Inner lip ex- 

 panded above. Umbilicus deep, open, about one-eighth of the greatest 

 diameter of the shell. 



Diameter Maj., 2-5 mm. ; min., 2 mm. : height, 1-25 mm. 



Animal unknown. 



Type in my collection. 



Hob. Macquarie Island (A. Hamilton). 



24. Laoma liratula, Suter, 1909. Plate 30, fig. 1. 



Laoma (Phrixgnathus) Unttulu, Sut,, P. Mai. S.. viii, 1909, 262, pi. 11, f. 26. 



Shell very small, turbinate, perforate, corneous, with radial brown 

 streaks, not shining, thin, periphery keeled. Sculpture consisting 

 of very fine dense oblique growth-striae and very distinct micro- 

 scopic spiral lines, which are finer and closer together on the proto- 

 conch. Colour corneous, with rather regular broad radial brown 

 streaks, sometimes coalescing on the body-whorl ; they are faint or 

 absent upon the base. Spire conoidal, its outlines almost straight, 

 height the same as that of the aperture. Protoconch convex, of 1 

 turns. Whorls 5, regularly increasing, lightly convex ; periphery 

 keeled, base rounded. Suture impressed. Aperture lunate, oblique. 

 Peristome thin and sharp, strengthened inside by a thin callosity. 

 Outer lip sharply angled. Columella short, vertical, almost straight. 

 Inner lip expanded. Perforation moderate, about one-eighth of the 

 greatest diameter, deep and quite open. 



Diameter, 4-2 mm. ; height, 3 mm. 



Animal unknown. 



Type in my collection. 



Hob. New Zealand, exact locality unknown (collected by the 

 late Mr. C. Traill). 



Remarks. The rather wide and open perforation separates it from 

 its near congener L. Cheesemani. 



L'5. Laoma marginata, Hutton, 1883. Plate 10, figs. 4, a, b. 



Phri.ntH'tthus marginatus, Hutt., T.N.Z.I., xv, 1882 (1883), 137 ; xvi, 196. 

 Laoma marginata, Hutt., Man. Conch. (2), viii, 60, pi. 23, f. 94-96. 

 L. (Phrixgnathus) marginata, Hutt. : Hedley and Suter, P.L.S. N.S.W. 

 (2), vii, 647 : Suter, J. de Conch., xli, 278. 



Shell minute, conical, openly perforated, finely striated, thin, 

 semitransparent, sharply keeled, horny with radial brown bands. 



