HELIX-LAOMA. 59 



Pfeiffer's description indicates a shell larger than the individual 

 described above and figured ; some others before me have rather 

 higher spire. 



L. ARIEL Hutton. Unfigured. 



Shell small, depressed, scarcely shining, finely ribbed, subperfor- 

 ate ; color pale yellowish-horny. Spire conoidal, depressed, with 5 

 slowly increasing whorls, the last obscurely carinated ; finely stri- 

 ately ribbed, the base delicately spirally striatulate ; suture 

 impressed; umbilicus covered ; aperture oblique, lunate; peristome 

 thin, the columellar margin reflected. 



Greatest diameter '13, least *12, height '1 inch. (Hutt.} 

 North Island of New Zealand at Auckland, Wanganui Parua 

 Bay near Whangarei. 



Phrixgnathus ariel HUTTON, Trans. N. Z. Inst. xvi, pp. 177, 196, 

 1883. SUTER, 1. c., 1891, p. 278. 



Distinguished from the other species of the genus by being finely 

 ribbed, and from H. po&cilosticta by the columella not being thick- 

 ened, and the suture not margined. From H. granum it differs in 

 color and in having the umbilicus covered. (Hutton.') 



L. TRANSITANS Suter. PI. 23, figs. 85, 86, 87. 



Shell conoidal, subperforated, finely striated with growth lines, 

 faintly shining; color pale yellow-horn, irregularly banded with 

 chestnut ; transparent, fragile. Spire conoidal, apex rather obtuse. 

 Whorls 5, slowly and regularly increasing, rather flattened, the last 

 acutely keeled, stria? very delicate, slightly arcuate; suture not 

 deep, not margined. Aperture vertical, subrhomboidal ; peristome 

 rather thin, angulated ; outer lip strongly callous, the white cal- 

 losity reaching to a good distance in the interior. Columellar mar- 

 gin slightly deflexed, callous, short, regularly arched. Base convex. 

 Umbilicus very narrow, partly covered. In young specimens the 

 callosity extends very far backwards, and the umbilicus is open. 

 Diameter, greatest 3, least 2A, height, 2$ mill. (Sut.} 



Heavy Bush, Parua Bay, Whangarei (Ch. T. Musson). 



Phrixgnathus transitans SUTER, Trans. N. Z. Inst. 1891, p. 297, 

 t. 22, f. 40a, b. 



This species is very near Ph. marina Hutt., but has no lamellae or 

 teeth in the aperture, and the suture is not margined. It may be 



