CHEMNITZIA. 437 
tentacular auricles; the margins are thin, often reflexed up- 
wards towards the shell, and it posteally assumes a form 
varying from the needle point to an obtuse termination, 
carrying on a simple lobular eminence of the main foot, at 
its Junction with the body, a minute, delicate, pearl-coloured, 
obliquely-striated operculum. The animal is very active and 
free. Taken with the C. acicula in the same locality. The 
animal of this species has hitherto escaped observation. 
I stated in the 7th vol. of the ‘Annals of Natural History,’ 
N.S. p. 391, that I considered the C. clavula a variety of 
C. acicula, and confidently predicted that no animal would 
ever be discovered of such variety which would exhibit decided 
specialties. I believe this error has originated from having 
had varieties of the C. acicula sent me for examination 
instead of the true ‘clavula.” I apprehend this must have 
been the case, as no one with the true shells can confound 
the two. Whether I am right or wrong in this conjecture, 
the acquisition of eight living examples of the C. clavula 
proves, that as regards both the shell and animal it is very 
distinct from C. acicula. 
Cu. Warrent1, Thompson. 
Odostomia Warren, Brit. Moll. ii. p. 292, pl. 96. f.2,3; and iv. 
p- 280. 
Chemnitzia decorata, nonnull. 
Animal inhabiting a white subturreted shell of four com- 
pressed volutions, with oblique sutures; the basal part of the 
body-whorl being finely, superficially, and irregularly spirally 
striated. The mantle is even with the shell, but has the 
power of relaxing itself so as to produce a small conduit at 
the upper angle of the aperture. The rostrum is short, 
cloven as far as the eyes, having the segments curved to the 
right and left. The tentacula are short, triangular, bevelled, 
not broad, tapermg to a fine pomt, and armed with small 
white inflated tips; they are carried in front of the head with 
an angular divergence of about 75°; the eyes are close toge- 
ther at the united internal bases. The foot is short, concave 
in front, slightly auricled, posteally terminating obtusely, with 
