Marwickx.—The Struthiolariidae. 189 
Struthiolaria fossa n. sp. (Plate 15, figs. 8, 9.) 
Shell small, ek : zm gradate, about equal in height to aperture ; 
whorls 5, but X broken, early whorls convex, later ones with high 
shoulder and ides inclined | а be flat ; sculpture, first three whorls regularly 
spiralled by 12 fine cords with equal interstices, on penultimate whorl these 
become narrow ridges with wide interstices, there Wo also 2 obscure but 
` wide cinguli, the raised shoulder has now 3 fine spiral threads ; body-whorl 
with 5 spirals on shoulder, and 21 narrow spiral ridges with wide inter- 
stices below, the 6 on base being slightly stronger; 5 obscure cinguli with 
equal interspaces ; suture in deep channel, 2 mm. wide; aperture ovate, 
channelled above, produced below into very short open canal; outer lip 
thickened, reflexed, only slightly sinuous, edge rounded, columella concave, 
ending in beak bent forwards and to right; inner lip regularly calloused, 
equal in width to outer lip, not ascending on body-whorl. 
ere. in collection o и New аео Geological Survey. 
Height, 36 mm. ; diameter, 25 
Locality. —191, E apen’ s, Kilkee kero Creek, Ngaruroro River, Hawke’s 
—This species is characterized by the deeply excavated channel 
round the shoulder of the whorls. In ornamentation it resembles some 
varieties of S. vermis, but may be Pur RR by the much dg and 
more regular spiral ridges, as well a the even, though weak, cinguli. 
It further differs from S. parva in Tol weaker cinguli and flatter sides. 
A close connection exists between 8. fossa and S. convexa; both occur 
in the same district and in the same formation. The two shells are easily 
separated, however, by means of the canaliculate suture and flat sides of 
the former. These features show that the species is not only more advanced 
an S. convexa, but is also a phylogerontic development 
Struthiolaria rugosa n. sp. (Plate 13, fig. 2.) 
1914. Struthiolaria cingulata Zittel: Suter, N.Z. Geol. Surv. Pal. Bull. No. 2, 
pl. 1, fig. 9 (not of Zittel). 
Shell ovate, spire about same height as aperture; whorls 6, convex; 
sculpture, spire-whorls with 5-6 strong cords with narrow interstices, lowest 
e and having secondary spirals on it and on wide interspace 
below it, boron with 15 equal cords, with interstices of almost same 
aperture ovate, channelled above, with very short wide canal below ; outer 
lip thickened, reflexed, bisinuous ; inner lip with strong regular callus 
equal in width to outer lip ; columella concave, strongly bent to right below. 
Holotype in collection of the New Zealand Geological Survey. 
Height, 40 mm. ; diameter, 27 mm. 
ity.—Pa tea. 
Remarks.—As stated on page 179, this shell was Hutton's plesiotype of 
S. cingulata Zittel. This mistake arose from Zittel's figure representing a 
specimen with unusually convex whorls; but the characteristics featured, 
obsolete bicarination of the body-whorl, and the disposition of the inner 
lip-callus show that 5. cingulata belongs to the papulosa group, whereas 
there can be no doubt eg > specimen falls under the vermis group. 
In outline it is very near S. c a, but is easily distinguished by the strong 
spiral cords, which are ена" йй by the prominent growth-lines. 
