LEUCOTINA. 171 



aperture oblong-ovate, half the length of the shell; columella white 

 straight, parietal fold hardly visible. 

 Length 2? lines, breadth H lines. 



Port Jackson, deep water (Coll. Angas). 



Leucotina esther ANG., P. Z. S. 1867, p. 116, 225, pi. 13, f. 31. 



L. SINUATA Angas. PI. 49, figs. 14, 15, 16. 



Shell elongately turreted, thin, semipellucid, white, transversely 

 striated with narrow, equidistant, opaque diaphanous lines, and 

 crossed on the last whorl with extremely delicate longitudinal striae; 

 whorls 8, convex; sutures channelled; aperture ovate, angled 

 above, rounded below ; columella arcuate, a little flattened and 

 reflected over the body-whorl ; outer lip deeply sinuous above, form- 

 ing a sharp angle at its junction with the last whorl, rounded and 

 effuse below. Alt. 3J lines, diam. H lines. (Aug.). 



Dredged on the "Sow and Pigs" reef, Port Jackson (Brazier). 



Myonia sinuata ANG., P. Z. S. 1877, p. 39, pi. 5, f. 18. 



Although in this shell the slight plait or twist on the columella is 

 not discernible, it otherwise resembles a Myonia; and I have, there- 

 fore, placed it in that genus, which belongs to the Acteonidce, rather 

 than with Monoptygma or Menestho. The sinuous outer lip is a re- 

 markable feature in this species. (Aug.*). 



L. MINUTA Smith. PI. 60, fig. 17. 



Shell minute, oblong, white ; whorls 5, the nucleus rounded, intro- 

 verted, spirally lirate ; the following whorls convex, with spiral 

 delicate lirse (about 7 on the penultimate whorl), the interstices a 

 little narrower than the lirse and very delicately longitudinally 

 sculptured. Aperture ovate, acuminate above; below, with the 

 arcuate and dilated columella, slightly effuse ; columellar fold central, 

 distinct. Alt. 2}, diam, J mill. Shorter variety 2j mill, long, 1 

 mill. wide. (Smith). 



St. Helena. 



Leucotina minuta E. A. SM., P. Z. S. 1890, p. 298, pi. 24, f. 9. 



The apex of this species is peculiar, being introverted as it were, 

 and partly enveloped by the succeeding whorl. It is not smooth as 

 is frequently the case in other species, but obliquely spirally lirate. 

 The raised lines iu the grooves between the ridges produce a sub- 

 punctate appearance. 



