484 i Transactions 
laterally-elongate tubercles. A fifth spiral emerges from suture-line on 
to base and is slightly crenulated by ends of axials; below this are 2 
smooth and much fainter ribs, the rest of base smooth. Spire a little higher 
than aperture. Suture much impressed. Aperture slightly oblique, sub- 
ovate, angled above, effuse below. Регіѕіоте discontinuous. uter lip 
in, but does not appear to be finished. Columella slightly oblique, 
arcuate. 
Very .close to Ё. pingue (Webster). No specimens of this species have 
been available for comparison, and Webster does not state the number 
of axials per whorl, but from the description and figure his species would 
seem to have weaker axials and a rounder body-whorl than the fossil shells. 
The specimens are not adult, but, in view of the slight differences noted, 
it is probable that actual comparison of adult shells of the two species 
would show wider divergence; till then the fossil species is best treated 
as distinct. 
Linemera interrupta (Finlay). 
Rissoa gradata Hutt. (not of Phil.). 
This species has also considerable analogy with L. pingue (Webster), 
but is characterized by its irregularly-placed spiral ribs, these being crowded 
anteriorly, but almost absent posteriorly, so that spire-whorls have only 
two distinct ribs close to suture below. There are, however, traces of 
faint flattish ribs with linear interstices between these and suture above, 
and a distinct groove crosses ribs just below suture. L. filocincta (H. & P.) 
is a very similar shell, but has more regular spiral ribs. 
Linemera pukeuriensis n. sp. (Fig. 4.) 
Shell moderately large for the genus, elongated, clathrately sculptured, 
rather thin, imperforate. ^ Protoconch o mooth and shining lowly- 
convex whorls, nucleus minute, swelling rapidly, sharply marked off fro 
the sculptured whorls. Shell-whorls nearly 4, convex, body-whorl regularly 
and gently rounded. Four thin spirals per whorl, interstices many times 
their width ; spirals equidistant, but a wider concave space between the 
first one and suture above. Another strong spiral emerges on base from 
suture-line, and 4 weaker but similar spirals cross remainder of base, the 
lowest often obsolete. Axials begin at same time as spirals and are narrow, 
well impressed. Aperture ovate, oblique, projecting basally Peri- 
stome continuous; outer lip with sharp edge but considerably thickened $ 
just previously by a strong varix. Columella slightly oblique, arcuate. — 
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