Narrative of the surveying voyages of his majesty's ships Adventure and Beagle (vol.1): between the years 1826 and 1836 : describing their examination of the southern shores of South America, and the Beagles's circumnavigation of the globe

CATALOGUE — SHELLS. 547 Habitat in mare alto circa oras Patagmicas. Mus. nost., G. Sofvcrbi/. Taken by a dredge in 40 fathom water, off the coast of South America, in latitude 44i° south, and found adhering to a Tere- bella. 4. Pholas Chiloensis. Molina. P. testd elongatd postice ovato-rotundatd, costis posticis dentato- muricatis ; antice attenuatd striis transversis postici undato- muricatis, antice muticis ; lat. 5 : long. 2 ; poll. Habitat ad insulam Chiloei. Mus. Brit., nost., Brod., Stokes. Some doubt has been thrown upon the existence of this shell, notwithstanding the description of Molina. A species very nearly approaching it, if not identical, was found at Rio de Janeiro ; but as only single valves were obtained, and these were in a very im- perfect state, I have not ventured to characterise it. The soft parts of Pholas Chiloensis are considered very delicate by the inhabitants of the Island of Chilo'e, by whom the animal is called " Co-mes." They are found in great abundance at low water imbedded in the rocks near Sandy Point, at San Carlos de Chilo'e. 5. SOLEN SCALPRUBI. S. testa lineari subrectd extremitatibus subrotundatis ; cardine biden- tato; long.l^; lat. 3iJ; poll. Habitat ad Patagonice oras Orientales (Sea Bear Bay). Mus. nost. 6. Anatina elliptica. A. testd elliptica, subtenui, transversim striata, antice snb-truncatd, epidcrinide fused, tenui ; long. If ; lat. 2| ; poll. Habitat ad oras Antarcticas (New South Shetland). Mus. Brit., nost. This shell was found at New South Shetland, by Lieutenant Kendall, of his Majesty's sloop. Chanticleer, by whom it was presented to me. 7. Mactra edulis. M. testa stibtrigond, tuniidd, sublwvi, fulvo-squalidu, intus alba, dentibus lateralibus prominentibus ; long. 2; lat. 2^; poll. Habitat in freto Magellanico (Port Famine). Mus. Brit., nost., Brod, This shell was found in great abundance on the flat of sandy mud, which fronts the west shore of Port Famine, and proved a 2n2