188 Transactions. 
whole surface with about 12 spiral threads some of which are more pro- 
minent than others, body-whorl with 4 strong rounded spiral cinguli, and 
a fifth rudimentary on base, which has 6 stronger threads and 4 or 5 weak 
ones, the fine spirals of spire continue on body-whorl, but in interstices 
of cinguli there is generally one more prominent than others; suture 
bounded below by narrow flat surface; aperture ovate, channelled above, 
produced below into very short canal; outer lip reflexed, thickened, edge 
rounded, sinuosity very shallow. Columella concave, ending in truncated 
beak bent to right, inner lip with regular callus, about equal in width to 
outer lip. 
Holotype in collection of the New Zealand Geological Survey. 
Height, 36 mm.; diameter, 23 
mm. 
Localities.—81, Castle Point, east Wellington ; 1040, Twaite's Cutting, 
Martinborough. — - 
Remarks.—This species differs from S. acuminata in its shorter spire 
and weaker cinguli; from S. parva in its greater size, wide cinguli, and 
many more spirals on base. The nearest relationship is to S. fossa and 
to S. conveza. he former has weaker cinguli, flat sides, and canali- 
culate suture, while the latter may be distinguished by its very much 
weaker cinguli and convex outline. The systematic position is probably 
etween S. acuminata and S. convexa, development being along the lines 
of a weakening of the spiral cinguli and an increase in the number and 
decrease in strength of spirals on the base. 
Struthiolaria convexa n. sp. (Plate 15, figs. 3, 4.) 
two; aperture ovate, channelled above, produced below into very short 
widely-open canal; outer lip reflexed, thickened, edge rounded, sinuosity 
very shallow; columella concave, ending in beak bent to right; inner 
lip with fairly regular callus, equal in width to and hardly ascending above 
junction with outer lip. 
Holotype in collection of the New Zealand Geological Survey. 
Height, 43 mm. ; diameter, 
S. vermis, but in the latter species the spiral striae are always finer and 
more irregular. 
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