Laoma.] GASTROPODA. 757 



Diameter, 3 mm. ; height, 3 mm. (type, with 6 whorls). Diameter, 

 4 mm. ; height, 4 mm. (specimen with 8 whorls). 



Dci;i>n,,.Rutton, T.N.Z.I.. xvi. 168. pi. 11, f. D. 



Jaw arcuate, papillate, with about 23 broad plaits. 



Radula having the formula 27+1 + 27 : teeth normal. 



T>n><' in the British Museum. 



Hob. North Island : Thames (Adams) ; Toko, near Stratford : 

 Mount Egmont, 3,000 ft. to 4,500 ft. (Murdoch) ; Forty-mile Bush 

 (H. S.). South Island: Kenepuru ; Greymouth (Helms); Riccarton 

 Bush (H. S.). 



30. Laoma serratocostata, Webster. 1906. Plate 30, fig. 4. 



Phrixgnathus serratocostata, Webst., T.N.Z.I., xxxviii, 1905 (1906), 311. 

 pi. 39, f. 4, 4a. 



Shell of 4J rounded whorls, horny without markings ; the limita- 

 tion of the coarse protoconch is not clearly defined, but there is a 

 U-whorled smooth apex ; the body- whorl has 21 flanges, wide on 

 the periphery and rapidly diminisliing towards the suture, the entire 

 length beset with close-set hooked teeth, turned towards the apex : 

 the spaces between are clearly reticulated with revolving and incre- 

 mental striae ; the flanges are not continued on the base, but are 

 represented by striae of varying strength. Periphery bluntly angled : 

 columella widely reflexed above, perforation about one-twelfth ^of^' 

 major diameter. (Webster.) 



Diameter, 1 mm. ; height, 0-75 mm. 



Animal unknown. 



Type in Mr. Webster's collection. 



Hab. North Island : Waiuku. 



I have not seen this species. 



31. Laoma spiralis, Suter, 1896. Plate 10, figs. 9, a, b. 



Laoma (Phrixgnathus) spiralis, Suter. P. Mai. S., ii, 1890, 3<>. pi. 4\. lB^-18. 

 Shell very small, depressedly turbinate, perforate, corneous with 

 brown streaks, dull, thin, semitransparent, membranously plaited, 

 ciliated at the periphery. Sculpture of the post-nuclear whorls con- 

 sisting of close-set radial oblique membranous costellse, 5 to 6 per 

 millimetre, produced into small ragged processes at the suture and 

 keel of the body-whorl ; interstices with fine growth-lines, decussated 

 by rather distant microscopic spiral lirse, more prominent on the base. 

 (Jolour pale-horny, with somewhat irregular radiate rufous streaks, 

 very faint on the base. Epidermis thin, the processes easily rubbed 

 off. Spire conic, rather acute, about 1| times the height of the aper- 

 ture ; outlines straight. Protoconch of 1J convex and smooth whorls, 

 conic. Whorls 5, gradually increasing, flatly rounded, the last whor 

 somewhat constricted at the suture, sharply keeled at the periphery ; 

 base rounded. Suture impressed. Aperture transverse, squarish. Peri- 



