ORTMANN : TERTIARY INVERTEBRATES. 179 



Affinities: A similar species is Trochita filosa Gabb (1869, p. 15, pi. 2, 

 f. 25) from the Miocene of California, but in T. filosa the radiating striae 

 are still finer, and often dichotomous. 



no. INFUNDIBULUM CORRUGATUM (Reeve). 



PI. XXXII, Fig. V M . 



1859 Trochita corr. Reeve, Conch. Icon., v. 11, pi. 2, f. 9. 



1867 Clypeola corr. Gray, in: Pr. Zool. Soc. London, p. 735. 



1886 Calyptrcea ( Infundibulum) radians Tryon (pro parte), Man. Conch., 



v. 8, p. 121, pi. 35, f. 84-88. 

 1897 Trochita corr. v. Ihering, in: Rev. Mus. Paul., v. 2, p. 279, pi. 4, f. 



1 8, pi. 5, f. 26. 

 1899 Tr. corr. v. Ihering, in : Jahrb. Miner., etc., v. 2, p. 25. 



Shell subcircular, conical, more or less elevated. Apex more or less 

 central. Surface with distinct radial ribs; the latter rounded, about as 

 broad as the intervals, and crossed by concentric or spiral lines, which 

 are not parallel to the suture. Interior with a spiral diaphragm, which 

 is a little reflected at the columellar side, but does not form a false 

 umbilicus. 



Height, 15 mm; diameter, 20 mm. 



Height, 8mm; diameter, 19 mm. 



Remarks : This species is very variable in external form, higher or more 

 depressed, and in the development of the radiating ribs. The latter are 

 more or less distinct, sometimes quite indistinct. These ribs are some- 

 times visible on the cast, but in most cases they are not, which renders 

 it impossible to distinguish casts of very depressed individuals from the 

 following species. 



Tryon identifies the living T. cormgata with radians of Lamarck, and 

 possibly he is right : T. radians differs only in the much larger size (see : 

 Reeve, pi. i, f. 3). 



From San Julian we have a very large cast (pi. XXXII, f. 5'), which 

 would correspond in size to T. radians, except for the higher conical 

 form. This cast appears to be smooth, but I think I can see indistinct 

 traces of radial ribs. 



Mr. Hatcher has collected a large number of specimens of the recent 

 /. corrugatum at various localities on the coast of Patagonia, and they 



