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. 559 The denticules of the outer lip are ranged ia pairs, at regular and somewhat distant intervals. 60. Triton scaber, T. testd ovato-acutd, cancellatd ; spiru elongatd ; epidermide fused, setosd ; aperturd albd granulosd ; labro interne obtuse denticulato ; long. ; lat. ; poll. Habitat ad oras Americce meridionalis (Valparaiso). Mus. nost. The denticules of the inner lip are more elevated than those of the last (T. ranelliformis), and are equidistant. It was fished up with the anchor in Valparaiso Bay. 61. MONOCEROS FUSOIDES. M. testd ventricosd, spird mediocri, anfractibas bicarinatis ; anfractu basalt lineis elevatis admodum distantibus cincto ; aperturd patidd ; dente labiali brevi, lato, obtuso ; canali producto, recto, intcgro ; nperculo corneo ; long. 2| ; lat. 1^ ; poll. Habitat ad oras Americce meridionalis (Concepcion). Mus. Brit., nost., Brod. Approaching Fusus in its elongated and entire canal, while its exterior lip has the labial tooth which distinguishes Monoceros. The columella is not straight, as in all the other species, but curved, so as to make an angle in some specimens at the commencement of the canal, and in all it becomes very broad at the point where it is opposite to the tooth. The shell is of a reddish colour, ventricose, and girt with elevated lines, about a quarter of an inch apart. The spire has only two of these lines on each whorl, and has a bicarinated appearance. The aperture is wide, the outer lip sinuous, its tooth short, broad, and obtuse, and the operculum horny. The shell is seldom found in a perfect state, the beak being generally broken off, and the surface is, in all the specimens that I have seen, covered with a calcareous encrustation, entirely concealing the colours. 62. BUCCINUM MURICIFORME. B. testd ovato-Jtisiformi, cinered ; anfractibus tumidis, costellatis, costellis cancellatis ; aperturd castaneo-nigricante ; labri margitie crenulato. Muricem mentiens ; long. 1 ; lat. -f^ ; poll. Habitat ad Jretum Magellanicum. Mus. Brit., nost., Brod. The eggs of this species were found, and are preserved in spirits.