а: _ ЖЕ 
зс. 
FıNLAY.—New Shells from New Zealand Tertiary Beds. 457 
by 6 subequal spiral threads with narrow spaces between, but between lower 
cords of body-whorl central thread is more prominent, with one or two others 
ones) are strongly bossed with bluntly-conical warts. There are more o 
s subequal to spirals and with linear interstices. ole of 
sculpture except nodules extends over varices, which form regular, fairly 
high, convex ridges, running almost parallel to axials. Outer lip with sharp 
raised edge inside varix, strongly dentate by 9 teeth within. Columella 
straight, with 5 plaits on lower part and a few rugosities above these. 
Parietal wall shows basal sculpture plainly, and bears strong plait near 
outer lip. Canal about half length of aperture, bent to left and slightly 
backwards. Spire a little less in height than aperture with canal. Sutures 
not strong, almost straight. 
Height, 25mm.; diameter, 13mm. ; height of aperture with canal, 
15 mm. 
Type (unique), from MeCullough's Bridge, Waihao (Waiarekan), in 
collection of New Zealand Geological Survey, kindly lent for examination 
and description through Mr. Marwick. 
Closely related to the preceding species, differing in its varices (which 
much more prominent than the others. Secondary sculpture, too, is a little 
different, both axials and spirals being much wider than their interstices 
in the Waihao shell, but much narrower in C. revolutum. The next species 
is another ally. 
Cymatium kaiparaense n. sp.. (Plate 48, fig. 8.) 
This is so evidently descended from the previous species and so like it 
in most respects that a full description is unnecessary, the general style of 
shell and sculpture being the same 1n both. It differs in having carinate, not 
convex, whorls, even at an early stage, due to stronger peripheral and weaker 
shoulder spirals. In this it is intermediate between C. marwicki and the 
species next described. Secondary sculpture more like that of C. revolutum, 
axial and spiral threads being much narrower than their interstices. The 
most striking difference, however, is that varices are only a little over half a 
whorl apart instead of three-quarters whorl—i.e., on successive whorls the 
varices are nearly in line, while in C. marwicki and the next species varices 
oceur nearly in line only on alternate whorls. Although there are the same 
number of nodules in both species, they do not appear any closer on 
C. kaiparaense, but rather the reverse, due to the fact that they are less 
elongated and more prickly and are not appreciably more numerous on 
spiral below periphery. 
Satisfactory dimensions cannot be given, on account of the fractured 
state of the type. 
