the characteristic Queensland operculates, Papina and Helicina , 
present. Among the inoperculates the Placostylus claims affinity 
with the New Zealand and New Caledonian forms, and utterly 
repudiates kinship with Australian life. 
1. Nanina sophle, Gaskoin , 1854. 
Illustrations . Reeve, Conch. Icon, vii., pi. 196, fig. 1377 ; 
Cox, P.L.S., N.S.W., ser. 2, Vol. ii., pi. 20, figs. 8, 9 ; Tryon, 
Man. Conch, ser. 2, Yol. ii., pi. 16, fig. 26. 
Descriptions . Gaskoin, P.Z.S., 1854, p. 152 ; Pfr., Mon. Ilel. 
Viv., Vol. iv., p. 59 ; Tryon, Man. Conch., 2-2-83. 
Type. British Museum. (?) 
Hab. The lower and wooded portions of the island, where it is 
plentiful. 
var. conica, Brazier , 1889. 
Illustration . Brazier, Aust. Mus. Mem., 2, pp. 26, 29, pi. 5, 
figs, 5, 6, (reversed). 
Type. Australian Museum. 
Hab. Rabbit Island ; plentiful under stones. 
Shell smaller and more elevated than the type, globosely conical, 
scarcely perforate, base rounded. Diam. maj. 25, min. 23, alt. 
19 mill. Jaw (pi. xxi., fig. 3) lunate, with central rostriform limb, 
smooth, ends rounded. Radula (pl.xxii.,fig. 7) tongue-shaped, three 
times as long as broad ; formula, 140 rows of 70 : 26 : 1 : 26 : 70; 
the rows are nearly straight in the centre of the ribbon, the 
laterals curving back slightly from the centre, after the transition 
teeth are passed the marginals sweep back in a parabolic curve ; 
the rachidian possesses a slender lanciform cusp whose apex barely 
surpasses the basal plate, at one-third of its length it is furnished 
with two small auxiliary cusps ; the laterals are slightly larger 
than the rachidian and equal each other in size, alate angle of 
basal plate hardly expanded, the inner accessory cusp is suppressed 
and the main cusp just surpasses the base of attachment ; the 
marginals succeed three or four transition teeth, they are minute, 
diminishing rapidly, cusp bicapitate, base Insinuate. 
2. N. HOWiNSULiE, Cox, 1873. 
Illustration . Cox, P.L.S., N.S.W., ser. 2, Vol. iv., pi. 19, ligs. 
10 , 11 . 
Descriptions. Cox, P.Z.S., 1873, p. 140; Pfr., Mon. Hel. Viv., 
Vol. vii., p. 205. 
Type. The original of the description is in the Cox Collection, 
that of the figure in the Australian Museum. 
Uab . Replaces the preceding species on the summit of the 
mountains. 
