202 
PATAGONIAN EXPEDITIONS ! PALEONTOLOGY. 
or subacute nodes. In the upper part of the whorls, in the region of the 
nodes, the spiral ribs (8 to io of them) are fine and subequal ; in the lower 
part, below the nodes, are, on the last whorl, 5 to 6 stronger ribs, alter- 
nating with finer ones, followed by about 5 finer ones in the lowermost 
part of this whorl. 
Height of largest complete individual : 56 mm, diameter, 35 mm ; a 
fragment has a diameter of 40 mm. 
Remarks : V. Ihering does not mention the finer ribs on the lowermost 
part of the last whorl, which are not shown in casts.. Well-preserved 
specimens of medium size agree completely with Philippi’s figure of 5 . 
chilensis , having the nodes more conical and subacute, and thus I was led 
to believe that 6*. ameghinoi and chilensis are identical. But v. Ihering 
writes to me, that the true .S', chilensis has 19 very fine spiral threads in 
the region of the nodes. If that is the case, it is impossible to unite 
these two species. 
Record of specimens : Mouth of Santa Cruz River, 43 sp. ; San Julian, 
Oven Point, 1 sp.; 30 miles north of Upper Rio Chalia, 4 sp.; Lake 
Pueyrredon, base of Tertiary, 5 sp.; Lake Pueyrredon, 600' above base, 1 sp. 
Distribution: La Cueva and Santa Cruz, Suprapatagonian and Pata- 
gonian beds (v. Ih.). In 1899 (p. 37) v. Ihering doubts the occurrence of 
this species in the “Patagonian” beds. 
Affinities: S. chilensis Phil, is the representative of this species in the 
Navidad beds of Chili (Matanzas and Navidad). 
132a. Struthiolaria ameghinoi var. multinodosa var. nov. 
PI. XXXIII, Fig. 11 6 . 
Not so high, more globular. Whorls convex, hardly angulated, nodes 
18-19, more elongated and distinctly costiform. Only 4 to 5 stronger 
ribs on the lower part of the last whorl, without intermediate finer ones, 
followed by about 5 finer ribs on the lowermost part of this whorl. 
Height, 32 mm, diameter, 21 mm; another: height, 41 mm, diam- 
eter, 27 mm. 
Remarks : I first believed that this was v. Ihering’s S. ornata var. dense- 
striata (1897, p. 291, textfig. 15) ; but after having sent a specimen to v. 
Ihering he informs me that it is not his S. densestriata , the latter being 
merely a S. ornata without the two larger spiral ribs. 
