Marwicx.—Naticidae and. Naricidae of New Zealand. 561 
of Lower Waipara qoem. MM greatly elongated specimens are seen 
grading into typical intrac 
At many localities oh dé east coast of the North Island, in beds 
somewhat younger than the Awa ссы occur rather smaller shells, generally 
with a mucronate apex (U. mucronatus). Some are of an elongate-oval 
hape, while others are more ike the typical U. huttoni. On the west 
coast (North Island) those of typical shape do not rise any higher than 
the Mokau beds, but in чз Onairo fauna appears an acuminate-spired 
from Р 
The forms which have been given specific rank are :— 
(1.) U. huttoni. 
(2.) U. intracrassus. The shell on which the name is founded is 
of such extreme development as to merit specific separation. 
The 
the apertural callus is noticeably thic 
(3.) U. unisulcatus. This is only slightly more » aider than ovate 
eni of U. huttoni from Waikaia. At the lower horizon, 
however, there is an Ve aimes with broader forms, but 
at the higher these are abse 
(4.) U. mucronatus. Although анса adult ү = SA. eei 
by high forms of young U. hutton?, the callus e former 
"loli not actually known, but reported a well-sinking in the Murray 
Dese The disposition of ‘the apertural callus is not the same as in 
the New Zealand species, for it is much wider over the umbilicus than on 
the parietal wall, where it is disc died narrow. It is most likely that a 
critical examination of the actual specimen would show other a 
differences, and that it should be classed as a distinct species 
Uber intracrassus (Finlay). (Plate 58, figs. 9, 11.) 
55, Natica (?) callosa Hutton, Cat. Tert. Moll., p. 9 (not of Sowerby). 
. Polinices callosus er Te N.Z. Geol. Surv. Pal. Bull. 2, p. 4. 
ices intracrassus Finlay, Proc. Malac. Soc., vol. 16, p. 101. 
Shell large, subcylindrical, nci flatly convex ; spire concealed by 
body-whorl, which has the left-to-right diameter much greater than that 
from back to front; apertura us enormous, completely filling the 
umbilicus and for last half of body-whorl occupying suture and extending 
across flat summit to apex. 
Holotype in ойгоно of New Zealand Geological Survey 
ix 30 nm. 37 mm. (estimated) ; diameter, front to back 29 mm., left to 
right 3 
ities. —Castle Point, Wellington (?) (type); County Council quarry, 
Maungapakeha Stream, six miles west-south-west of Tinui, Castle Point 
County ; Lower Waipara. 
The name N. callosa is preoccupied by Sowerby; therefore Finlay 
rightly changed Hutton’s name to intracrassus. Hutton was uncertain 
about the locality of his types, but Castle Point is probably correct in a 
broad sense. The richly thesiliferous beds at Castle Point itself (Geol. 
