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 B A 
1859 Trochita corn. Reeve, Conch. Icon., v. n, pi. 2, f. 9. 
1867 Clypeola corn. Gray, in: Pr. Zool. Soc. London, p. 735. 
1886 Calyptrcea (Infundibulum) radians Try on (pro parte), Man. Conch., 
v. 8, p. 12 1, pi. 35, f. 84-88. 
1897 Trochita corr. v. Ihering, in: Rev. Mus. Paul., v. 2, p. 279, pi. 4, f. 
18, 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, 8 mm; 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 veiy depressed individuals from the 
following species. 
Tryon identifies the living T. corrugata with radians of Lamarck, and 
possibly he is right : T. radians differs only in the much larger size (see : 
Reeve, pi 1, 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 
