176 Transactions. 
tubercles, are of a slender shape and small size, and have a sloping shoulder. 
It is quite possible that they can be separated as a distinct species. (See 
Plate 11, fig. 10.) 
Struthiolaria calcar Hutton. (Plate 11, figs. 8, 11, 13.) 
C ‘at. Tert. Moll., p. 11. 
1886. Struthiolaria calcar Hutton, Trans. N.Z. Inst., vol. 18, p. 335. 
1887. Struthiolaria calcar Hutton, Proc. Linn. Soc. N.S.W., ser. 2, vol. 1, p. 216. 
1914. Struthiolaria calcar Hutton: Suter, N.Z. Geol. Surv. Pal. Bull. No. 2, 
p. 17, pl. 1, fig. 8. 
Localities.—Shell-bed, Ardgowan, Oamaru (H. J. Finlay); Ashburton 
River, Canterbury (H. J. Finlay); Tengawai Cliffs, South Canterbury 
(Canterbury Museum). s 
Hutton gives as the original locality “ Oamaru " ; and, although the 
horizon cannot be stated definitely, it was probably Awamoan. Mr. Finlay 
has some fine specimens from the Ardgowan shell-bed and from the | 
Ashburton River. 
In all respects except the spur on the outer lip these shells are identical 
in appearance with S. subspinosa. Further, just as there are two forms 
of that species, a broad and a slender, so there are two similar forms of 
S. calcar. It is unlikely, however, that such a development should not 
have specific value. 
The specimen described by Suter as Hutton’s type is an artificial, plaster 
cast, and no trace of the original material now remains. Suter did not 
notice the nature of the “ holotype,” for he says (1914, p. 17), “ protoconch 
: : h 
bed (Plate 11, fig. 11) is here named **neotype." И, as seems probable, 
the plaster cast mentioned above was prepared directly from the original 
material it is a plastotype (Schuchert, 1905, p. 15); but there is no way 
of. proving this. 
Struthiolaria spinosa Hector. (Plate 11, figs. 12, 14.) 
1886. Struthiolaria spinosa Hector, Outline N.Z. Geol., p. 51, fig. 9, No. 13. 
1886. Struthiolaria tuberculata Hutton, Trans, N.Z. Inst., vol. 18, p. 335, in part 
not of 1873). 
1887. Struthiolaria tuberculata Hutton, Proc. Linn. Soc. N.S.W., ser. 2, vol. 1, 
p. 216, in part (not of 1873). 
