ORTMANN : TERTIARY INVERTEBRATES. 1 87 
belong. The specimen figured by Philippi in fig. ic is probably a differ- 
ent species from N. pachy stoma (N. oyarzuni Phil.). 
Record of specimens : Punta Arenas, horizon II (lower Magellanian), 
25 sp. ; Punta Arenas, horizon III (upper Magellanian), 2 sp. 
Distribution: Chiloe : Cueva de Cucao (Phil.). 
Affinities: In the ovate form, thickness of shell and callus, and the 
small umbilicus, this species resembles some Eocene species from the 
Paris basin, especially N. venusta Deshayes (1866, p. 38, pi. 68, f. 78), but 
the latter has a much more distinct suture, and the callus is not quite so 
thick as in our species ; there are other slight differences, but on the whole, 
N. venusta is the only species that I was able to compare with our Punta 
Arenas fossil. 
1 18. Natica ovoidea Philippi. 
PI. XXXIII, Fig. 2. 
1887 N. o. Philippi, Tert. & Quart. Verst. Chiles, p. 89, pi. 10, f. 10, a, b 
(and perhaps fig. 18, as N. solida). 
1887 N famula Philippi, ibid., p. 89, pi. 10, f. 13, a, b. 
1897 N. f v. Ihering, in: Rev. Mus. Paul., v. 2, p. 285. 
1899 N. f v. Ihering, in: N. Jahrb. Miner., etc., v. 2, p. 28. 
1900 At. ovoidea Ortmann, in: Amer. Journ. Sci., v. 10, p. 380. 
Shell ovate, moderately thick, smooth. Spire conical, about one-fourth 
to one-fifth as high as the shell. Umbilicus open, only partly covered by 
a comparatively thin callus. Mouth ovate, slightly dilated. 
Height, 27 29 24 20 12 mm. 
Diameter, 21 24 16.5 16 9 mm. 
Mouth: 21 23 18 16 9 mm. 
Remarks: N. fanmla is distinguished from N. ovoidea (and its allies), 
according to Philippi, by its smaller size (height, 15 to 18 mm) and thicker 
callus. Of our individuals, one is only 12 mm high, the rest are larger, 
and approach N. ovoidea (height 30 to 31 mm, according to Philippi). The 
callus may be called thick or thin, according to the species selected for 
comparison, but at any rate, in Philippi’s figure of N. famula , it is not 
thicker than that of N. ovoidea. Our large individuals agree completely 
with N. ovoidea , and since it is thus shown that this form is also found at 
Santa Cruz, it seems very likely that N, famula is only the young state 
of this species. 
