CHEMNITZIA. 425 
very slender varieties, one of which is figured in the ‘ British 
Mollusca,’ under the appellation of C. formosa, which most 
accurately represents our true Exmouth shells of the “ rufa,” 
in which, in perfect specimens, there are often fourteen volu- 
tions and twenty ribs on the body; they are plain, straight, 
and not raised; the suture, instead of a fine line, is decidedly 
grooved ; the interstitial striz are adequately developed; the 
basal periphery of the aperture is usually less rounded and 
more subquadrangular, and the base of the body-whorl exhi- 
bits greater tumidity than in the C. fulvocincta. Our beautiful 
and perfect specimens are not glabrous ; on the contrary, they 
show a palish dull rufous colour, with not a trace of the con- 
spicuous tawny-orange spiral fascia of its congener: in fact, 
the true “rufa” differs in every pot from the “ fulvocincta.” 
This comparison obliges me, with every deference, to submit, 
that for the Chemnitzia rufa of the authors of the ‘ British 
Mollusca,’ the C. fulvocincta be substituted, and the southern 
shell they have alluded to, be named C. rufa, as it and the 
Exmouth examples truly represent that species; of which 
their C. formosa is a slender variety and synonym; indeed 
its figure excellently represents the “ rufa.” 
The C. rufescens is decidedly distinct from either the 
“rufa” or “ fulvocincta,” 
Cu. rutvocincta, Thompson and Alder. 
Ch. fulvocincta, Brit. Moll. iv. p. 276, pl. 93. f. 4 (not fig. 3) ; (animal) 
pl. F.F. f. 4, as rufa. 
See the notes above for what is known of this species. 
Cu. sprrauis, Mont. 
Odostomia spiralis, Brit. Moll. iii. p. 299, pl. 97. f.2; (animal) pl. F. F. 
£639. 
Turbo spiralis, Mont. 
Animal occupying a spiral shell of four flat volutions. 
Mantle even. The colour in all parts is hyaline-white, deli- 
cately suffused with snow-white points of several magnitudes. 
The rostrum is moderately long, entire, flat, plain, rounded in 
