ORTMANN : TERTIARY INVERTEBRATES. 137 



63. VENUS CHILOENSIS Philippi. 



PI. XXVII, Fig. 10. 



1887 V. cJi. Philippi, Tert. and Quart. Verst. Chiles, p. 121, pi. 15, f. 6. 

 1900 V. ch. Ortmann, in: Amer. Journ. Sci., v. 10, p. 378. 



Shell ovato-elliptical, moderately swollen, both ends well rounded ; 

 apex at about one-fifth of the length. Area indistinct, nymphae immersed. 

 Lunula ovate, flat. Surface with widely distant, elevated lines, and sharp 

 radiating striations. 



Measurements: Length, 44 mm; height, 37 mm; diameter, 12 (x 2) 

 mm ; according to Philippi : Length, 62 mm ; height, 52 mm ; diameter 

 (double), 32 mm. 



Remarks: We possess only a single right valve, which is much smaller 

 than Philippi's figure, but agrees in all essential respects very well with 

 it. Since Philippi mentions this species from the Straits of Magellan, we 

 may safely assume that our individual comes from one of the type-local- 

 ities, as most of the fossils recorded by Philippi from "Magellanes" are 

 from Punta Arenas. 



Record of specimens : Punta Arenas, horizon V (Patagonian), i right 

 valve. 



Distrfoition : Ancud, Chile, and Straits of Magellan (Phil.). 



Affinities: This species comes near V. meridionalis in sculpture, but 

 differs in size and outline. Other relations see under V. meridionalis. 



64. VENUS MERIDIONALIS Sowerby. 



PI. XXVII, Fig. n a ' 6 . 



1846 V. mer. Sowerby, in: Darwin, Geol. Observ. S. Amer., p. 250, pi. 



2, f. 13. 



1887 K mer. Philippi, Tert. and Quart. Verst. Chiles, p. 120, pi. 14, f. 8. 

 1897 V. mer. v. Ihering, in: Rev. Mus. Paul., v. 2, p. 251. 

 1899 V. mer. v. Ihering, in: N. Jahrb. Miner., etc., v. 2, p. 19. 



Shell ovate, convex, both ends rounded. Apex between ^ and % of 

 the length. Area indistinct, nymphae immersed. Lunula well marked, 

 broadly lanceolate, a little convex and prominent. Surface with rather 



