528 Transactions, 
and 
bluntly angled above. Peristome and columella as in B. corulum (Hutt.). 
Umbilicus distinct, about one-sixth of minor diameter, chink-like, partly 
hidden by inner lip. 
Height, 1-6 mm. ; width, 1-5 mm. : 
Holotype and six paratypes, from Pukeuri, in the author's collection. 
In spiral and axial sculpture no difference can be seen between this shell 
and В. pukeuriensis n. sp. (described below), but it is readily separated 
from it by its non-subdiscoidal upper whorls (i.e., its spire-angle is constant 
and whorl-increase regular) and by its umbilicus, which is not round an 
open but more like that of B. corulum (Hutt.) The only other species 
B. iredalei resembles is B. corulum (Hutt.); but that shell is smaller, with 
lightly convex spire (angle about 45°), has much lower blunter and more 
inconspicuous axials, very much less prominent on base, interstices hardly 
wider than ribs; its spirals are much coarser and flatter, about half width 
of axials, separated by linear interstices ; and its umbilicus is considerably 
narrower and less prominent. 
Brookula tenuilirata n. sp. (Plate 53, figs. la, 1b, lc.) 
Shell minute but rather large for the genus, elevated-turbinate, thin, 
Axials 42 
Height, 2mm.; diameter, 1-5 mm. | 
Holotype and four paratypes, from Pukeuri, in the author's collection. 
This shell differs from B. iredalei mainly in its taller spire, less convex 
outline of whorls, and greater number of axials. In some respects—e-9-» 
shape, convexity of whorls, prominence of sculpture, and size and shape 
of umbilieus—it stands between B. iredalei and corulum (Hutt.); - 
B. 
especially reminiscent of the latter is the obsolescence of the axial 
sculpture on base. The spiral threads are rather more prominent than 
in B. iredalei, especially on base; t ey are also closer together on whorls, 
but wider apart on base than in B. iredalei. ! 
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