546 Transactions. 
The family seems to have had its maximum development as regards 
differentiation early in the Tertiary, so that few new generic divisions have 
been evolved since the Oligocene. A noticeable feature shown by Table 1 is the 
appearance of five new genera or subgenera after the Wangaloan, perhaps 
indicating an ingression of a northern fauna, for Natica s. str. appears 
The Bortonian (Park, 1916, p. 34) has been separated from the Waiarekan. 
and includes, besides the type locality, the Waihao greensands and 
"Island sandstone," the Kakahu greensands, and the Hampden beds. 
The stage as thus constituted still represents a long period of time, and 
should be further divided. The Waiarekan has been reduced to embrace 
Hutchinsonian. According to information from Mr. Н. J. Finlay, à 
considerable thickness of the fossilferous Clifden beds corresponds to 
these stages. 
ACKNOWLEDGMENTS. 
I am indebted to Mr. В. S. Allan and Mr. Н. J. Finlay for their generous 
loan of material and for permission to incorporate into this paper, for the 
sake of completeness, species that they had already separated out as new; 
also to the late Mr. R. Murdoch, Miss M. K. Mestayer, Dr. P. Marshall, 
Mr. W. R. B. Oliver, Professor R. Speight, and Dr. J. A.. Thomson for 
their kindness in lending valuable specimens for examination. 
TABLE 1.— APPROXIMATE TIME RANGES OF GENERA AND SUBGENERA. 
EI P OR RY ares a ea ee a EE es IS ER 
o 
3 ! Eocene to Miocene, Pliocene, 
Ramune ШШ 
E: 
г Oamaruian, Wanganuian, 
E z d 
; S 2135 ‚1218 
азага Dh boas 9 A i MUR. 
$3322 gi sl А algal elle 
а тая ЕЕЕ ЕЕЕ 
-|*-—| $ a BOX 
cnc cou ee еа ba Е Е р а 
Natica .. i И Feuer emma ack 
(Carinacca n. subg.) укен 
(Magnatica n. subg.) uuu c 
Suleonacca n. р... —— Ls 
Uber .. UNS З STU SONS CNN 
(Euspira) К Vine Stone ЗИ у a Busan 
Neverita is s 
Amauropsella — .. a 
Sinum .. s RENES 
Eunaticina iot ? 
Globisinum n. р... SUC ASIN TRENT SONUS PERI gen wc 
| 
V ge ату ирк канде Зи ак кс к ai КЫ БУИ | ЫЫ 
"E 
