106 MOLLUSCA. 
Cyclostoma roseum, GouLp; Proceed. Boston Soc. Nat. Hist., ii. 
205. March 1847. Expedition Shells, 39. 
SHELL small, elevated, ovate-conical, rather solid, smooth, of a pale 
rose-red, or flesh-colour. The spire is composed of six whorls, which 
are a little convex, and have a decided, but very narrow shoulder at 
the suture. Aperture less than half the length of the shell, ovate, 
acute posteriorly, coloured as exteriorly; lip pale, not reflexed, but 
somewhat everted to form a sharp edge. ‘The umbilicus enters by a 
very long, narrow channel, running behind the inner lip, and bounded 
outwardly by a delicate rib. 
Length of axis seven-twentieths of an inch; diameter one-fifth of an 
inch. 
Inhabits the Feejee Islands. 
This shell, with several others from the Pacific Islands, forms a 
group characterized by their slender, elevated form, and the rib 
which circumscribes the umbilical region. It is more deeply and 
uniformly coloured than C. rubens, Quoy, which is also smaller, 
thinner, and has a much larger umbilicus. 
Figure 121, front view of the shell, enlarged; 121 a, side view of 
the last whorl, enlarged ; 121 4, natural size. 
CyCLOsTOMA TEREBRALE (Gould). 
Testa parva, turrita, acuminata, flavida vel dilute cornea, levigata, 
umbilico rimato circumvallato perforata: spira elevata, acuta, anfrac- 
tibus sex ad octo convexiusculis, antice sub-angulatis, sese partim obte- 
gentibus ; sutura impressa: apertura sub-rotunda, postice angularvs, 
campanulata ; peristomate simplici, anfractui penultimo late adnato. 
Cyclostoma terebrale, Goud; Proceed. Boston Soc. Nat. Hist., 11. 
206. March 1847. Expedition Shells, 39. 
SHELL small, elongated, acutely turreted, pale-yellowish or watery 
born-colour; whorls seven, obtusely angular below the middle, espe- 
