360 MOLLUSCA. 
SHELL small and delicate, nearly circular at base, but a little angu- 
lar where the siphon issues. The shell is quite regularly conical, 
elevated, the apex entire, acute, recurved ; smoky ash-colour ; surface 
covered with numerous, crowded rib-strie, of which about every fourth 
one is larger; the lines of growth are very delicate, rather irregular, 
and merely give the surface a dead ground. Muscular scar narrow, 
but well impressed, within which the colour is chestnut, and outside 
of it mouse-coloured, lineated with paler to correspond with the ribs ; 
edge sharp and very delicately crenulated. 
Length two-fifths of an inch; breadth seven-twentieths; height three- 
twentieths. 
Inhabits the Sandwich Islands. 
A small, delicate species, very different from any I have seen. Its 
circular base and regular conical form, with its very numerous and 
nearly equal rib-strie, and its peculiar pale chocolate-colour distin- 
guish it. 
Figures 468, 468 a, 468 4, three views of the shell. 
SIPHONARIA LEPIDA (Could). 
Testa parva, tenuis, ovato-rotundata, depresso-conica, cinereo-olivacea 
mmterdum violaceo tincta ; apice submediano, obtuso ; costis radiantibus 
numerosis depressis, quorum ad duodecim majoribus, albicantibus ; 
strts incrementi conferts, laxis: intus livida, albido radiatim lineata ; 
margine viz crenulato, pallescente. 
Siphonaria lepida, Goutp ; Proceed. Boston Soc. Nat. Hist., ii. 154. 
August 1846. Expedition Shells, 11. 
AnimaL pale blue, thickly dotted with black, above; locomotive 
disk oval, deep olive-green; mantle pale, nearly colourless; head 
small, transverse. 
SHELL small, thin, rounded-ovate at base, with a salient siphonal 
angle, of a low pyramidal form, the summit obtuse, and nearly cen- 
