The denticules of the outer lip are ranged in pairs, at regular and somewhat distant intervals.
60. Triton scaber.
T. testâ ovato-acutâ, cancellatâ; spirâ elongatâ; epidermide fuscâ, setosâ; aperturâ albâ granulosâ; labro interne obtusè denticulato; long.; lat.; poll.
Habitat ad oras Americæ 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. testâ ventricosâ, spirâ mediocri, anfractibus bicarinatis; anfractu basali lineis elevatis admodum distantibus cincto; aperturâ patulâ; dente labiali brevi, lato, obtuso; canali producto, recto, integro; operculo corneo; long. 2¾; lat. 1⅝; poll.
Habitat ad oras Americæ 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.