236 
PATAGONIAN EXPEDITIONS! PALAEONTOLOGY. 
163. Cancellaria cf. medinae Philippi. 
PI. XXXVI, Fig. 4 °’ b . 
1887 C. m. Philippi, Tert. & Quart. Verst. Chiles, p. 68, pi. 7, f. 1. 
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, 12 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. vidali 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, 1 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. TEREBRIDAd Ad. 
Gen. TEREBRA Lmck. 
164. Terebra costellata Sowerby. 
PI. XXXVI, Fig. 5. 
1846 T. c. Sowerby, in: Darwin, Geol. Observ. S. Amer., p. 262, pi. 4, 
f. 70, 71. 
