GASTEROPODA. 269 
There is some little doubt about the habitat of this shell; but it is 
either Brazil or the Samoa Islands. 
Closely allied to C. avara, Say, in form, size, and ground colour, 
but readily distinguished by its distorted form, the encircling chestnut 
lines, and the want of revolving strie between the folds. 
Figure 338, animal, with the shell, as in motion ; 338 a, profile view 
of the shell. 
CoLUMBELLA CasTaNEA (Gould). 
T. parva, solida, elongata, ovata, levis, castanea vel fascia angusta 
allida cincta: spira ovato-conica, anfractibus septem convexts, ultimo 
ovali_trientes duos longitudinis teste superante, ad basim spiraliter 
striato: apertura ampla, alba; labro recto, postice emarginato, rufo- 
tincto, intus sub-plicato; columella anticé plicata; sinu siphonah 
amplo. 
Columbella castanea, Goutp; Proceed. Boston Soc. Nat. Hist., iii. 
170. January 1850. Expedition Shells, 71. 
SHELL small, solid, smooth, shining, elongated-ovate, pale chestnut- 
colour, with sometimes a pale girdle about the middle of the last 
whorl, a few revolving strie about the base, and occasionally a few 
indistinct ridges about the body of the whorl. Whorls seven, regu- 
larly convex, the last rather more than two-thirds the length of the 
shell, tapering to base; upper margin. of the whorls terminating 
abruptly in a delicate shoulder, dropping isto a deep canaliculate 
suture. Aperture narrow-ovate; outer lip somewhat sinuous poste- 
riorly, striated within; columella with a callus rising like a wall; 
rostrum very short, truncated ; peristome of both margins coloured rich 
brown ; interior porcelain-white. 
Length half an inch; breadth three-eighths of an inch. 
Inhabits Rio Janeiro. 
Compared with C. wnicolor it is smaller, the aperture is less rotund, 
and it las a pale cincture. 
68 
