482 Transactions. 
(B.) * RISSOINA " GROUP. 
Aperture semilunar, anteriorly effuse or channelled. 
32: cue wi elongate, with strong кер oy be ba oe axial riblets 
d by fine spirals, but the latte may be а nt); protoconch 
iol dome-sha ped ; whorls convex y oval, channelled 
below and above, peristome continuous, thickened. 
Rissoina. Type, R. inca D'Orb. 
13. Shell thin, white and highly pae : ~ sore smooth, sculpture 
inconspicuous (very fine spiral gro ve sometimes over the 
whole surface, pic Mid only a tow саа grooves on the base); 
Shape, often кн чад à whorls nearly fat; , aperture pear- 
-—— 1° д ^ni 
Nozeba. Туре, N. emarginata (Hutt.). 
14, Shell thin or solid; smooth (rarely with microscopic spiral entend ; 
protoconch minute, globose ; whorls flattened to convex; apert 
yriform or ovate, peristome continuous, hardly thickened. 
Dardanula, Type, D. olivacea (Hutt.). 
(C.) SKENELLA. 
— depressed, orbicular, umbilicated. 
15. Shell depressed, umbilicated ; smooth ; geom flatly convex, rather 
large ; whorls convex ; aperture large, subcirc 
бывае, Туре, S. georgiana Pfr. 
Of the above genera, Merelina, Onoba, Subonoba, Anabathron , Amphi- 
She. per ke are as yet unrepresented in the New Zealand 
Tertiary, while Haurakia, Lironoba, Notosetia, and Epigrus are here — 
recorded. for the first time. us Бартерт genus is Estea, wi with 
Descriptions of the new miii are appended, also notes on the other — . 
recorded species ; to facilitate identification a key to the fossil genera g 
to Mr. 
кы for Estea polysu 
Haurakia mixta n. sp. (Fig. 1.) 
Shell minute, ovate, axially costate. Protocone h blunt, of about 
Vi б 
below suture, but otherwise there is apparently no spiral sculpture in 5 
interstices or on base. Spire conical, a little higher than aperture, ow outlines 
almoststraight. Sutureinconspicuous, Aperture squarely ovate, subangled | 
above, flattened below. Peristome nearly continuous, sharp. Columella | 
vertical, subtruncate at base. Imperforate. ; 
Height, 1:2 mm. ; diameter, 0-7 mm. ; height es dis apes 0-5 mm. 
Type, from Castlecliff, in the author's coll 
h H. 
ые species has analogy with H. hamiloni Sut.) and Н. huttoni (But) | 
CM g in some respects in чаш betweer them. It is probably ly juvenile, 
is distinctly аен by its flattish whorls, squat form, and infra- 
sutural groove. 
