ORTMANN ! TERTIARY INVERTEBRATES. 
161 
Gastropoda. 
Fam. PA TELLIDAd Carp. 
Gen. PATELLA L. 
90. Patella pygivlea Ortmann. 
PI. XXX, Fig. 7°- e . 
1899 P. p. Ortmann, in: Amer. Journ. Sci., v. 8, p. 430. 
Shell subconical, outline regularly oval. Apex situated in the anterior 
half. Surface with fine, crowded, a little unequal, radial ribs, crossed by 
concentric lines of growth, and very finely granulated. 
Length, 7 mm; width, 5 mm; height, 4 mm. 
Remarks: This may be an Acmcea . Pilsbry (1891, p. 7) says of 
Acmcea: the shells may generally be distinguished from Patella by the 
different texture and the marginal border of the inside. The presence 01- 
lack of this border cannot be ascertained in our specimens, since the in- 
terior is filled with matrix. 
There already exists an Acmcea hero Icli forma pygmcea Dunker (see: 
Pilsbry, 1891, p. 45). If our species should prove to belong to Acmcea , 
the specific name is ill chosen, but cannot be changed, unless pygmcea 
Dunker is regarded as a good species. 
Record of specimens: Punta Arenas, horizon III (upper Magellanian) ; 
1 sp. 
Fam. FISSURELLIDAP Riss. 
Gen. FISSURELLA Brug. 
91. Fissurella eurytreta Cossmann. 
PI. XXX, Fig. 8. 
1899 F' e - Cossmann, in : Journ. Conchyliol., p. 3 (of sep. cop.), pi. 1 1, f. 1. 
Shell depressed, elongated-elliptical ; foramen subcentral, large, ellip- 
tical. Surface with radiating ribs. 
Length, 21 mm; width, 12 mm; altitude, 5.5 mm. 
Remarks : Surface ornaments not seen in our individual, which is a cast. 
Record of specimens : Upper Rio Chalia ; 1 cast. 
Distribution: Jegua quemada, Suprapatagonian beds (Cossm.). 
