ORTMANN : TERTIARY INVERTEBRATES. 237 



1887 T. c. Philippi, Tert. & Quart. Verst. Chiles, p. 67, pi. 7, f. 3 (after 



Sowerby). 

 1897 T. c. v. Ihering, in: Rev. Mus. Paul., v. 2, p. 311. 



Shell turrite, elongate. Whorls numerous, convex in the middle, in 

 the upper part depressed, with an indistinct, depressed line running par- 

 allel to the suture. 1 1-15 longitudinal ribs on each whorl ; these ribs are 

 slightly curved, and extend from suture to suture, although less distinct 

 in the upper, depressed part. Mouth elongate, with a short canal. Colu- 

 mella smooth. 



Height (of fragment), 29 mm; diameter, 10 mm. 



Remarks: V. Ihering distinguishes two varieties: var. quemadensis, 

 with the ribs extending from suture to suture, and more elongate mouth, 

 and var. santacruzensis, with the ribs indistinct just below the suture, 

 and shorter mouth. Our specimens seem to belong to the first variety, 

 since the ribs, although less strongly pronounced on the upper part, still 

 are distinctly discernible, and since the mouth is a little more elongate 

 than in Sowerby's figure. 



Recently, v. Ihering has informed me, that the Chilian T. costellata is 

 different from both Patagonian forms, but does not say in what char- 

 acters. 



Record of specimens : Mouth of Santa Cruz River, 3 sp. ; Lake Pueyr- 

 redon, 600' above base, i sp. (jun.). 



Distribution : La Cueva and Jegua quemada, Suprapatagonian beds (v. 

 Ih.); Navidad, Chili (Sow., Phil.). 



Affinities: The genus Terebra is rare in Eocene deposits, but the num- 

 ber of species increases rapidly from the Miocene upward. It is a char- 

 acteristic tropical genus. 



Hoernes (1856, p. 134, pi. 11, f. 30) records this species (T. costellata] 

 from the Miocene of the Vienna basin ; comparing his figure and descrip- 

 tion with our individuals, I do not believe that they are identical ; in our 

 species the ribs are much stronger, less numerous, and the whorls are 

 more distinctly convex. Nevertheless, there is a close resemblance to 

 this Miocene species. 



(The second Navidad species of Sowerby, T. imditlifera, has been 

 identified by Hoernes, p. 130, with T. acuminata of Borson from the 

 Miocene and Pliocene, of Europe and, indeed, I cannot see any differences 

 between them.) 



