558 Transactions. 
microscopic spirals crossed by fine growth-lines ; suture deeply and widely 
channelled (about 1mm. wide in a shell of 10 mm. diam.); aperture 
semilunar, narrower above; outer lip slightly concave, retracted to suture 
above; inner lip with thin enamel on parietal wall; umbilicus widely 
open, bounded by low ridge outside which is broad sulcus caused by notch 
in anterior margin of aperture ; on umbilical side of this notch is a thickening 
of margin which gives rise to ridge. 
Holotype in collection of Mr. R. S. Allan. 
Height, 11 mm. ; diameter, 10 mm. 
Localities.—Greensand, Waihao Downs (type); 164, greensand above 
coal-beds, Kakahu. 
Sulconacca compressa n. sp. (Plate 57, fig. 3.) 
Shell rather small, ovate, with compressed sides; spire gradate, about 
one-half the height of aperture; whorls 5, with microscopic spirals crossed 
by fine growth-lines; suture channelled (about 0-75 mm. in a shell of 
10 mm. diameter); aperture ovate; outer lip slightly concave and gently 
retracted to suture, inner lip with thin enamel on parietal wall; umbilicus 
narrow, bounded by low ridge and shallow furrow. 
Holotype in collectión of Mr. H. J. Finlay. 
Height, 11 mm. ; diameter, 9 mm 
Locality.—ic, Clifden. 
This species is distinguished from S. prisca by its more compressed shape, 
slightly narrower channel, ovate aperture, narrow umbilicus, and wea 
circum-umbilical sulcus. 
Sulconacca vaughani n. sp. (Plate 57, fig. 4.) 
ell; sutural channel when shell is 10 mm. in diameter i 
o wide and about half this in depth; whorls smooth and 
polished, with some fine spirals crossed by inconspicuous -lines ; 
inner side of furrow is a more or less prominent ridge or basal limb. 
Holotype in collection of New Zealand Geological Survey. 
Height, 14-5 mm. ; diameter, 12 mm. : 
)es.— 1161, Pakaurangi Point (type); 166, Mount Horrible, 
Pareora River; Otiake beds, Trig. Z, Otekaike; 1172, Pukeuri, Oamaru; 
uppermost Mount Brown beds, Weka Pass [= N. australis (in part) of 
Suter, 1921, p. 43]; 882, sandy claystone above limestone, Waitomo 
Valley; 862, argillaceous sandstone, head of Waimata River; upper- 
maru; Rifle Butts, Oamaru; Awamoa : 
(H. J. Finla 5 Ardgowan; 1144, Okoko Road, one mile west of Pehu 
Trig., Upper Waitara; 1142, near junction of Tangitu Stream and Waitara 
River (L. I. Grange). 
Distinguished from suturalis by its large size, slightly narrower sutural 
channel, and straight outer lip not Зере to жы» = en from bottom 
MOSCA Nest 
