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. 551 Habitat ad oras insulcs Tierra del Fuego et infreto Magellanico. Mus. Brit., nost., Brod. Shell oblong-ovate, and generally of a chestnut red, and the granulose ligament black ; the colour of the younger specimens is more brilliant, and sometimes interspersed with yellow. Middle valves slightly toothed, and very delicately lineated, the lines forming an obtuse angle in the direction of the axis of the shell the lateral compartments are marked with deeper striasa or grooves, radiating from the upper angle to the base, which, crossing the transverse markings of the valve, have a reticulated appearance : the anterior and posterior valves are radiated with fine lines. This Chiton was discovered by Mr. Bowen, surgeon of the Beagle, by whom it was presented to me. The specimen was sent home among a collection of Natural History, transmitted in the year 1827. 22. FiSSURELLA COARCTATA. F. testd ovatd, antici attenuatd, elevatd ; radiis frequentibus elevatis ; interna virescenti ; foraminis margvne externo juxta medium coarc- tato, subdentato ; long 2y^g ; lat. 1-^| ; alt. -j^ J ; poll. Habitat ad Portiim Praya. Miis. Brit., nost, 23. Helix translucens. H. testd subghbosd, translucente, levissime transversim striatd anfractu basali lined longitudinali castaned sub^medid ornato long' kl I lat. ^^ ; poll Habitat ad Rio de Janeiro, Mus. Brit., nost., Brod. 24. Helix pusio. H. testd rotundo-complanatd, creberrime striatd, translucente, maculis castaneo-rvjis ornatd ; long, -^'g ; lat. -^^ ; poll. Habitat ad Juan Fernandez. Miis. Brit., nost., Brod. 25. Helicina sordida. H. testd globoso-conoided ; anfractibus rotundatis longitiidinaliter striatis ; operculo castaneo ; long. \ paulo plus ; lat -^^ paulo plus ; poll. Habitat ad Rio de Janeiro. Mus. Brit., nost. The colour of this shell is of a dirty yellowish white, with a slight tinge of diaphanous violet within the margin of the lip. 26. Pupa subdiaphana.— No. 194. MSS. P. testd cylindraced, alba, subdiaphand, transversim creberrime sub- striatd J long. ^ paulo mimes ; lal.-^^^ paulo minus ; poll.