250 PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
smaller than those from Lake Pueyrredon ; the measurements of the 
larger are : Height, 27 mm, diameter, 29 mm. In general shape they 
agree with the Lake Pueyrredon specimens, and it could be ascertained 
that the base and parietes are porous, and the orifice is also large and 
subhexagonal. But since scuta and terga are wanting, we can unite this 
form only with doubt with this species, although it would not be strange 
— if this form really exists in the Patagonian beds — that it is also found 
in the Cape Fairweather beds. 
Record of specimens : Lake Pueyrredon, base of Tertiary, 2 sp. Cape 
Fairweather, 2 sp. 
Distribution : Recent: Peru, Chili, Patagonia (Darw. Weltn.). Accord- 
ing to Darwin, fossil in a superficial, recent bed at San Josef, Patagonia. 
According to Darwin, Philippi, and Moericke, fossil in the Pliocene Co- 
quimbo beds of Coquimbo and Caldera, Chili, and according to Philippi, 
also in the Navidad beds of Guayacan, La Cueva, and Navidad, Chili. 
177. Balanus varians Sowerby. 
PI. XXXVIII, Fig. 3 a " e . 
1846 B. v. Sowerby, in: Darwin, Geol. Observ. S. America, p. 264, pi. 2, 
f. 4-6. 
1854 R. v. Darwin, Mon. Cirrip. Balan., p. 298, pi. 8, f. 9. 
1887 R. v. Philippi, Tert. & Quart. Verst. Chiles, p. 224, pi. 51, f. 1, 6 
(after Sowerby). 
1887 Chthamalus antiquus Philippi, ibid., pi. 51, f. 7 (after Sowerby). 
Shell very variable in shape, conical or tubular, often inverted conical 
and much elongate. Orifice moderately toothed, large, subtrigonal or 
subrhomboidal. Walls either smooth or longitudinally folded, the elong- 
ated specimens are most apt to be smooth. Parietes moderately thick, 
imperforate or (rarely) with traces of pores. Radii narrow and oblique, 
their upper margins more or less oblique and rather smooth. Basis flat 
or (in elongate specimens) deeply cup-shaped, calcareous, porose. Scutum 
elongate-triangular, outer surface with fine lines of growth, without radi- 
ating sculpture. Inner surfaces with a very prominent articular ridge ; 
adductor ridge absent. Tergum with the longitudinal furrow indistinct, 
spur short, bluntly pointed, narrow, about one-fifth or one-sixth the 
width of the valve, placed at more than its own width from the basi- 
