250 PATAGONIAN EXPEDITIONS : PALEONTOLOGY. 



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"- 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. i, 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- 



