2 44 PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
individual. In all other respects there is no difference between Philippi’s 
figure and description, and our specimen, so that I am entirely satisfied 
that we have to deal with this species. 
Record of specimens: Punta Arenas, horizon II (lower Magellanian), i sp. 
Distribution: Navidad and Matanzas, Chili (Phil.). 
Affinities: Philippi and Moericke (1896, p. 596) compare this species 
with A. tornatilis (L.), Neogene and Recent, Europe (see Hoernes, 1856, 
p. 508, pi. 46, f. 24), but in my opinion, there is no closer relation to this 
species, A. tornatilis being much more slender and differing in sculpture. 
Among the Eocene species of the Paris basin there is A. turgidus (Des- 
hayes) (Deshayes, 1864, p. 594, pi. 37, f. 14-16), which agrees very closely 
with our species in form and sculpture, and, indeed, there is hardly any 
difference, except the much more considerable size (15 mm) of A. turgidus. 
Cossmann (1897, p. 2, pi. 1, f. 6, 9) has lately described another, but 
much smaller (height, 4.5 mm ; diameter, 3 mm) species from supposed 
Eocene beds of South Australia, A. subscalatus, which is also closely 
allied to our species in form and sculpture. 
1 71. Action semil^evis Ortmann. 
PI. XXXVII, Fig. 6 “’ b . 
1900 A. s. Ortmann, in: Amer. Journ. Sci., v. 10, p. 377. 
Shell elongate-oval, rather slender; spire short, conical, about one- 
Tourth of the length of the shell. Whorls 4, convex, the upper ones 2-3 
times as broad as high. Suture distinct, a slight carina running close to 
the suture and parallel to it on the uppermost part of the whorls. Below 
this carina, there is an indistinct spiral groove. Below the latter, the sur- 
face of the shell is smooth ; but in the lower third of the last whorl there 
are 5-7 spiral furrows, which are rather broad, almost as broad as the flat 
intervals. Mouth elongate, wider below, columella with a distinct fold 
below. 
Height, 7 mm; diameter, 3.5 mm. 
Remarks : The smooth part of the whorls exhibits in one specimen very 
slight traces of spiral structure, but only close to the edge of the mouth. 
The furrow running close to the upper sutures appears sometimes bifid 
toward the mouth. 
Record of specimens: Mt. of Observation, upper horizon, 3 sp. 
