.174 PATAGONIAN EXPEDITIONS I PALEONTOLOGY. 



Height, 9 mm; diameter, 3.5 mm (v. Ihering gives: height, 19; diam- 

 eter, 7; Cossmann: height, 5; diameter, 2 mm). 



Remarks: One of our specimens is isolated, and it is smaller than v. 

 Ihering's, but larger than Cossmann's. The only difference of Cossmann's 

 species is the small size and small number of whorls (5-6). Our in- 

 dividual is exactly intermediate in these respects between both, and so 

 there is no doubt that Cossmann's species is only the young stage of this 

 species. The fold on the inner lip is well seen in our specimen. The 

 other specimen in our collection is larger, but as it is imbedded in matrix, 

 no exact measurements can be given. 



In the use of Odontostomia for Odostomia I follow Dall (1892, p. 248). 



Record of specimens : Mouth of Santa Cruz River, 2 sp. 



Distribution: Jegua quemada, Suprapatagonian beds (v. Ih., Cossm.). 



Affinities: According to Cossmann, this species is distinguished by the 

 angulated whorls from the Eocene species of France. I do not know any 

 other species in which this feature is shown, except a variety of O. con- 

 oidea Brocchi (Dall, 1892, p. 250). This variety is mentioned by Wood 

 (1848, p. 86), from the Pliocene of England. He says "the angulated 

 edge of the volution gives a subcanaliculated form of suture to another 

 variety" (fig. 3a on pi. 9). 



O. conoidea is found from Miocene to Recent times in Europe, the 

 United States, and the West Indies. 



Gen. TURBONILLA Riss. 

 1 06. TURBONILLA CUEVENSIS v. Ihering. 



PL XXXIII, Fig. 8"'". 



1897 T. c. v. Ihering, in: Rev. Mus. Paul., v. 2, p. 276, textf. u. 



1899 T. iheringi Cossmann, in: Journ. Conchyliol., p. 13 (of sep. cop.), 

 pi. 10, f. 12. 



1900 T. c. Ortmann, in: Amer. Journ. Sci., v. 10, p. 380. 



Shell elongate-pyramidal, surface with longitudinal ribs and indistinct 

 spiral striae. Longitudinal ribs about 20 on the last whorl, not extending 

 to the base. Whorls flat, suture distinct and sharply canaliculate. Mouth 

 ovate, columella with an indistinct fold. 



