FixLAY.—New Shells from New Zealand Tertiary Beds. 463 
to the subgenus Duda There does not, however, seem to be any 
similarity between the two latter shells, but C. eraratum, apart € A 
much smaller size, seems quite close in all details to C. partheno 
is here grouped with it. C. spengleri does not closely resemble other = 
land species. No sectional names are ré amily ; 
of the six genera admitted, Cymatium and Austrotriton both need sub- 
ivision, but it is so diffieult to place many T in even a suitable 
obscure, that no sectional division has here been attempted. One cannot 
help recalling Kesteven’s argument (Proc. Linn. Soc. N.S.W., vol. 27, 
trito M 
insignitum and Cymatium decagonium are out of place, but the opis are 
grouped, according to deii relationships, into ten more or less distinct 
groupe 
KEY то TRE NEW ZEALAND CYMATIIDAE. 
Shell with 3 varices in ? whorls. 
(A.) Shell of peri growth, due to flattening before a varix and 
us inflation after it (often inconspicuous in 
е 
(а.) у usually rather squat; keel sharp or blunt, 
tendin; distorted 
an 
pratt high, and prominent, even on early whorls, 
teeply descending on either side; canal usuall 
ong AUSTROTRITON (а). 
(b.) Shell more _ slender and tapering ; ; keel tending to 
disappear with age; of less disto A gos ас 
шй; ; varices broad, low. incon- 
Ге on early кр of much gentler сне оп 
er side, especially behind ; canal short СнАкохтА (b). 
(B.) Shell of almost regular pm the 9" bein g hardly 
arene by the varices, which are like ios of 
At strotriton CyMATIUM (c). 
solid. Shell with 4 varices in 2 whorls. 
(d.) Shape ER : — shouldered, with a strongly 
a; ces cleva MAYENA (d). 
(e.) — oval; ы; who convex, — subnodulosely 
riated ; varices flattened ARGORUCCINUM (е). 
(С) Shell 
Shell with irregular varices, 2, 1, or none to a whorl. 
(D.) Shell e deseri fusiform ; whorls convex, surface neatly 
ted by thin and — — and isin 3 
сои convex but low PRIENE (f). 
(a.) (Group 1.) Periphery of body-whorl angled. 
(i) No Pent keels below this; 5 intervariceal 
bo 
is is . cyphoides. 
i.) Three re keels below this ; ; 9 intervariceal 
A. insignitum. 
s (Gr 2.) Periphery of body-whorl subquadra 
G) ) P shell slender ; spire much higher than ec BTE 
and cana 
(ii) Shell squat ; spire subequal to aperture ond 
canal. 
me 
. (2) minimum. 
l. Aperture almost smooth within; 3 
nodules between last two varic A. parkinsonianum. 
2. Aperture "— ета» on colu. 
mella and i lip ; nodules be- 
tween last uum varices є А. maorium. 
