ORTMANN : TERTIARY INVERTEBRATES. 1 97 
1897 T. patag. v. Ihering, in : Rev. Mus. Paul., v. 2, p. 287 (after Sowerby), 
1899 T. patag. v. Ihering, in: N. Jahrb. Miner., etc., v. 2, p. 26. 
Shell elongated, forming an angle of about 17 to 24 0 . Suture simple, 
not in a furrow. Whorls flat, with a number of finer or stronger striae, 
three of which are usually stronger and granulate. 
Height, 28 mm (not complete); diameter, n mm; height, 38 mm (not 
complete); diameter, 14 mm. 
Remarks: This species resembles T. ambulacrum in its more rapidly 
increasing whorls, but is distinguished at once by the lack of a sutural 
depression. The three larger revolving ribs are less pronounced, and in 
well preserved individuals they show distinct granulations, which are inde- 
pendent of the lines of growth. 
There is no doubt that the form mentioned by v. Ihering in 1899 under 
the name of T. patagonica agrees with our individuals ; but there is some 
doubt whether it is really T. patagonica of Sowerby, since the figure 
given by the latter shows a distinct sutural furrow. But in this respect 
the figure does not correspond to Sowerby’ s diagnosis, which says : 
“sutura indistincta.” Perhaps — as v. Ihering suggests — this figure is 
not accurate. 
I have not the slightest doubt that Philippi’s T. darwini belongs here, 
since diagnosis as well as figure correspond closely, with the exception 
that granulations are not mentioned : but their apparent lack may be due 
to fossilization, as is the case in most of our specimens. 
Young fragments are hard to distinguish from T. ambulacrum , since in 
young ones of the latter species the suture is much less deep than in older 
ones. 
Record of specimens : Mouth of Santa Cruz River, 6 sp. ; Paso del Rio 
Santa Cruz, 1 sp. ; San Julian, Oven Point, 11 sp. ; 30 miles north of 
upper Rio Chalia, 2 sp. 
Distribution: Port Desire (Sow.), Santa Cruz (Roch. & Mab., v. Ih.), 
Navidad beds of Chili: Navidad (Sow., Phil.), Lota, Tubul, Lebu 
(Phil.). 
Philippi erroneously says that Darwin found this species at Puerto del 
Hambi*e (Port Famine). 
■Affinities: T. chipolana Dali (1892, p. 312, pi. 22, f. 24), from the 
Miocene of Florida seems to be closely allied in form and sculpture, but 
the sculpture seems to be more complex and more strongly developed. 
