164 
PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
have seen above, these granulations are present in the Patagonian fossil. 
On the other hand, there is a Miocene species, 5 . turritella Dali (1892, p. 
408, pi. 23, f. 2), from Florida, and even a Pliocene species, Margarita 
maculata Wood (1848, p. 135, pi. 15, f. 3), which much resemble our species, 
so that it is impossible to say that the Patagonian shell has a distinctly 
Eocene appearance. 
Gen. CALLIOST OMA Swains. 
95. Calliostoma philippii (Ortmann). 
PI. XXX, Fig. 1 2 a ' b . 
1899 Trochus ph. Ortmann, in: Amer. Journ. Sci., v. 8, p. 430. 
Shell low, conical, not umbilicated. Whorls almost flat, only very 
slightly convex. Last whorl sharply angular on the periphery; above 
this angular ridge there are 4 revolving ribs. Lower surface slightly 
convex, with 5 strong, revolving ribs, the most exterior of them separated 
from the peripheral ridge by a broad groove. Ribs of lower surface with 
regular, strong granules ; similar granules seem to have been present on 
the ribs of the upper part of the whorls. 
Height, 7 mm; diameter, 11 mm. 
Remarks : There already exists a Trochus philippii Koch (see : Pilsbry, 
1889, p. 52), but since our species comes in the genus Calliostoma , no 
change of the specific name is necessary. 
The upper surface of the whorls is not well preserved in our specimens, 
so that the characters of the sculpture, especially the granulations, are not 
plainly recognizable. 
This species differs from T. fricki Philippi (1887, p. 101, pi. 12, f. 7), 
from the Navidad beds of Chili in the following details: (1) the whorls 
are slightly convex (in T. fricki perfectly flat) ; (2) the revolving ribs are 
less numerous (in T. fricki there are 6 on the upper part, and at least 7 
on the lower part) ; (3) the umbilicus is absent. 
C. philippii differs from C. observations in the following particulars : ( 1 ) 
the revolving ribs are less numerous (in C. observations 5-6 in the upper 
part, 9-10 on the base); (2) the ribs of the base are separated from the 
periphery by a groove ; (3) there are granulations present. 
Record of specimens : Punta Arenas, horizon III (upper Magellanian) ; 
2 sp. 
