128 Transactions. 
n form and sculpture this species is in perfect accord with Vexillum, 
but it lacks the important characters on the columella; it makes some 
approach to P. nodosoliratus Suter. We place this species provisionally in 
Antimitra, one of the many genera created by Iredale; unfortunately, that 
author mars his otherwise good work by burying generic names in the text 
and by simply nominating the type without reference to its characteristics. 
Triploca waihaoensis n. sp. (Plate 13, fig. 4.) 
The single specimen available is very fragmentary, the outer lip imper- 
fect, and the spire missing; sufficient, however, remains to distinguish the 
species, and it is the first record of the genus in our fauna. 
Shell small, last whorl convex at periphery and uniformly curved to 
anterior end, very slightly projecting at suture, the latter a little impressed 
not deep. Sculpture consists of small flat-topped spiral riblets and axial 
growth-lines, the latter in places slightly crenulating the riblets, spiral 
rooves natrower than riblets, about six or seven between lip and suture 
above, on body below periphery are four or five much smaller than those 
above and below (this may be an individual character), about twenty-four 
spirals in all, those at umbilicial depression small and rounded. Aperture 
oblique, narrow and somewhat produced at base; columella short, almost 
straight, reflexed and with three stout oblique plaits, the anterior two nearer 
together. Impressed area behind columella partly obscured with matrix 
but does not appear to be a true umbilicus. 
Length of last whorl, 7 mm. ; width, 5-5 mm. ; aperture, greatest oblique 
length, 6 mm. | 
Locality: Greensands immediately below the limestone, McCullogh’s 
Bridge, Waihao River. 
_ This species is closely allied to T. ligata Tate; it appears to differ 
in the narrower and more oblique aperture, the shorter columella, and 
Mus. Cat. Ter. Moll., pt. 1, Australasia, 1897, pp. 9-10, pl. 1, figs. 24, 2 | 
protoconch) points out that Tate’s species is evidently very variable ; 
the deep sulcation bordering the suture of the type specimens is occasio T 
scarcely more prominent than the other spirals; that the latter are not | 
always persistent over the whole of the whorls, one museum вребШ и 
showing the body-whorl suleated over two-thirds of the surface only. Жой 
the above it will be noted that for specific determination it is unsafe t0 — 
attach overmuch importance to the number of spiral suleations OT ther — 
disposal. Kk 
Tate's species from the Adelaide bore he classified as Eocene. 
(op. cit.), reviewing the Limacinidae and Volutidae from the lower ter 
of Australia, is not disposed to assign to them so great an age, remart 
that their development is more advanced than one would expect to | 
in beds as old as the true Eocene, The age of the Waihao greensands | 
discussed at pp. 116-19 in this volume: there can scarcely be апу 
that they represent the highest beds of the Hampden series. 
