236 PATAGONIAN EXPEDITIONS! PALAEONTOLOGY. 



163. CANCELLARIA cf. MEDIN/E Philippi. 



PL XXXVI, Fig. 4-. 



1887 C. m. Philippi, Tert. & Quart. Verst. Chiles, p. 68, pi. 7, f. i. 

 1900 C. cf. m. Ortmann, in: Amer. Journ. Sci., v. 10, p. 379. 



Very closely allied to C. gracilis, but differing in the following partic- 

 ulars: Shell broader and shorter, whorls distinctly angulated near the 

 deep suture; number of longitudinal ribs 14-15. Plaits of columella less 

 strongly developed. 



Measurements: of specimen from Mt. Observation: height, 10.5 mm, 

 diameter, 6 mm ; specimen from Santa Cruz : height, 1 2 mm, diameter, 

 7.5 mm. 



Remarks : If our individuals really belong to C. medince, they are very 

 young. Philippi gives: Height, 44 mm; diameter, 29 mm. But since 

 in all other respects they agree with Philippi's description and figure, I 

 identify them, although with some doubt, with this species. They cannot 

 belong to Philippi's C. mdali and the other allied form mentioned by him 

 but not described, both from Santa Cruz, since both possess an open 

 umbilicus, which is not seen in our individuals. 



Record of specimens : Mouth of Santa Cruz River, 3 sp. ; Mt. of Obser- 

 vation, upper horizon, i sp. 



Affinities: There are many species of the genus Cancellaria known 

 from Tertiary deposits of the northern hemisphere that may be compared 

 with those mentioned here, but I am unable to point out any close 

 affinities to any particular one. 



Fam. TEREBRID^E Ad. 



Gen. TEREBRA Lmck. 

 164. TEREBRA COSTELLATA Sowerby. 



PL XXXVI, Fig. 5. 



1846 T. c. Sowerby, in: Darwin, Geol. Observ. S. Amer., p. 262, pi. 4, 

 f. 70, 71. 



