ORTMANN : TERTIARY INVERTEBRATES. 73 



difference is the larger size and the more circular outline, which is not so 

 distinctly transversely-oval. 



Records of specimens : High bluffs S. W. of Lake Pueyrredon, i sp. ; 

 Lake Pueyrredon, base, 10 sp. 



Distribution: Miocene of South Australia (Tate) and Tasmania (Pritch.) ; 

 Oligocene (Oamaru system) of New Zealand (Hutt.); and recent, Ker- 

 guelen Islands, 150 fath. (Dav.). 



Fam. TEREBRATULIDsE King. 



Gen. MAGELLANIA Chemn. 

 17. MAGELLANIA LENTICULARIS (Deshayes). 



PI. XII, Fig. 5 M . 



1864 Waldheimia lentictilaris Suess, in: Novara Exp. Geol., v. i, p. 56, 



pi. 10, f. 3, 4. 



1873 IV. 1. Hutton, Cat. Tert. Moll. Ech., New Zealand, p. 35. 

 1886 W. I. Davidson, in : Trans. Linn. Soc., ser. 2, v. 4, p. 52, pi. 9, f. 2-13. 

 1897 Magellania globosa v. Ihering, in: Rev. Mus. Paul, v. 2, p. 268. 

 1900 Magellania lenticularis Ortmann, in : Amer. Journ. Sci., v. 10, p. 379. 



Shell regularly oval or subcircular in outline, lenticuliform or more or 

 less globose. Beak prominent, subacute, incurved ; beak ridges well 

 defined, forming a slightly excavated area. Foramen small. Valves uni- 

 formly convex, without a distinct sinus (a slight indication of a sinus is 

 said to be present in the recent form : in a few of our specimens there is 

 just a suggestion of it, but in most of them there is no trace). 



Length, 36, 35, 32, 29, 25 mm. 



Width, 31, 32, 31, 29, 23 mm. 



Remarks: This species, which is found still living in New Zealand, is 

 characterized chiefly by the regular outline and the very small foramen. 

 Terebratitla fontainiana d'Orb. from the coast of Chili seems to be its 

 American representative ; it is certainly not a synonym of M. venosa, as 

 Davidson (1886, p. 50, 51, pi. 8, f. 6) believes. T. fontainiana differs 

 from T. lenticularis in the more elongated form. 



I have seen four specimens of v. Ihering's M. globosa, sent by him to 

 the U. S. Nat. Mus., and they agree completely with our species. M. 



