ORTMANN : TERTIARY INVERTEBRATES. 1 87 



belong. The specimen figured by Philippi in fig. ic is probably a differ- 

 ent species from N. pachystoma (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. vemtsta is the only species that I was able to compare with our Punta 

 Arenas fossil. 



1 1 8. 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. solidd]. 

 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 N. 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 1 8 1 6 9 mm. 



Remarks: N. famula 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 1 2 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. 



