GASTEROPODA. 103 
Length of axis three-tenths of an inch; breadth nine-twentieths of 
an inch. 
Inhabits Upolu. Couthouy. 
This is not half as large as C. tiara, and may be recognised by its 
uniform grooving and fluting, its sub-globose form, its plain, flattened 
base, and its tunnel-shaped umbilicus, bordered by an overhanging 
carina. 
Fioures: 117, 117 a, two views of the shell; 1170, side view of a 
young shell with the animal. 
CycLostToMa PLicatuM (Gould). 
Testa parva, solida, rudis, pyramidata, cinereo-virens, plicis confertis 
obliquis rugata, et struis minutis volventibus cincta: spira acuta, an- 
Sractibus sex rotundatis et sutura bené discretis, ultimo ad peripheriam 
rotundato ; infra convexa et umbilico modico acuté marginato perfo- 
rata: apertura circularis ; peritremate sumplict. 
Cyclostoma plicatum, Goutp: Proceed. Boston Soc. Nat. Hist., i. 
205. March 1847. Expedition Shells, 38. 
Anima with a muzzle remarkably prolonged, so that at times it 
looks like a regular proboscis. Tentacles long and taper; eyes very 
distinct at external base; foot pale ochreous, upper part of head, neck, 
and sides a faint red. 
SHELL small, solid, rude, pyramidal-conic, of a pale greenish ash- 
colour, the whole surface striated with fine revolving raised lines, 
most prominent on the upper whorls, while the two larger whorls are 
closely and regularly undulated obliquely with prominent folds which 
are continued upon the base. Whorls six, convex, distinctly defined 
by the suture, rounded at the periphery. The base is convex, and 
perforated by a rather contracted, tunnel-shaped umbilicus, which is 
defined by an acute margin. The lip is acute and simple, very 
slightly everted. 
