254 PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 



Brazil, Peru, but not in Patagonia and Chili. In fossil state hitherto 

 unknown. 



179. BALANUS L^EVIS Bruguiere. 



PI. XXXVIII, Fig. 5-. 



* 



1846 B. coquimbensis Sowerby, in: Darwin, Geol. Observ. S. Amer., p. 



264, pi. 2, f. 7. 



1854 B. Icevis Darwin, Mon. Cirrip. Balan., p. 227, pi. 4, f. 2. 

 1887 B. coquimbensis Philippi, Tert. & Quart. Verst. Chiles, p. 224, pi. 51, 



f. 3 (after Sowerby). 

 1897 B- l^vis Weltner, in: Arch. f. Naturg., v. i, p. 263. 



Parietes and basis with pores ; parietes smooth. Orifice small. Scutum 

 with one or two longitudinal furrows, rarely with one inconspicuous furrow ; 

 articular ridge with its lower point produced into a free style; adductor 

 ridge sharp or blunt ; pit for lateral depressor muscle minute, but deep. 

 Tergum with a longitudinal furrow; spur of moderate length and breadth, 

 with its lower end obliquely truncated and rounded, situated at some 

 distance, but less than its width, from the basi-scutal angle. 



Remarks: A large colony upon a stone has yielded a number of scuta 

 and terga, which are to be identified with this species. The terga agree 

 completely with those of this species ; the scuta, however, do not repre- 

 sent the typical form, but rather the form designated by Darwin as var. 

 nitidus (fig. 2' and 2 7 ). The longitudinal furrow, in our specimens, is 

 quite shallow, sometimes appearing double. This fact is interesting in so 

 far as only the typical variety of B. Icevis is found at present on the coast 

 of southern Patagonia and Tierra del Fuego, while the var. nitidus is the 

 common form farther north in Chili and Peru. 



According to Darwin, B. coquimbensis is only a variety of B. Items, a 

 fact that has been overlooked entirely by Philippi and Moericke. The 

 central individuals of our colony approach the cogmmbensis-iorm. 



It seems that the Balani recorded by Philippi under the names of B. 

 apertus and by Moericke under B. aperftis and coquimbensis belong here ; 

 but since no opercular valves have been found, this remains doubtful. 



Record of specimens: Cape Fairweather, i colony of ca. 100 sp.; 12 

 scuta, 8 terga. (Two other, small colonies resemble this one, but have 

 not yielded any opercula.) 



