178 PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



Diameter, 20 mm ; height, 8 mm. 



Record of specimens : Arroyo Gio, i cast. 



Affinities: There are some species living on the western coast of South 

 America ; but without knowledge of the external surface our cast cannot 

 be compared with them. 



The genus Cntcibidum is found, according to Zittel (1885, p. 215), from 

 the Miocene to recent times in North America and the West Indies. 



Gen. INFUNDIBULUM Montf. 

 109. INFUNDIBULUM MERRIAMI (Ortmann). 



PI. XXXII, Fig. 4"- 6 . 



1887 Trochita costellata Philippi, Tert. & Quart. Verst. Chiles, p. 93, pi. 



u, f. 4 (non T. costellata Conrad, 1855). 

 1899 T. merriami Ortmann, in: Amer. Journ. Sci., v. 8, p. 430. 



Shell thin, depressed-conical ; apex central. Surface with numerous, 

 fine, radial ribs, or rather fine, radial forrows, separated by flat ribs. 



Height, 12 mm; diameter, 24 mm. (The measurements given by 

 Philippi in text and figure do not agree, although they refer to one and 

 the same individual ; the text gives : height, 9 mm ; diameter, about 25 ; 

 the figure shows: height, 14 mm; diameter, 18 mm.) 



Remarks: The genus Trochita Schum. 1817, is synonym with Infnn- 

 dibulum of Montfort 1810, but not with Infundibuhim of Klein 1753. But 

 since Klein's genus is Pre-Linnean, Infundibuhtm Montfort is to be used 

 as Tryon (1886, p. 103) does (as subgenus of Calyptrcea]. The chief 

 generic character is found in the distinct spiral diaphragm of the interior, 

 the columellar margin of which does not form a false umbilicus, that is to 

 say : although reflected, the reflected part of the diaphragm is closely 

 appressed, to that no opening remains. 



This species differs from the following (I. corrugatum) in the much finer 

 radial sculpture. This sculpture is well preserved in one specimen from 

 the lower beds, but hardly at all in that from the upper beds, which is 

 poor. 



Record of specimens : Punta Arenas, horizon II (lower Magellanian), 

 2 sp.; Punta Arenas, horizon III (upper Magellanian), i sp. 



Distribution: Lebu, Chili (Phil.). 



