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. 



CH. WARRENII, Thompson. 



Odostomia Warrenii, Brit. Moll. iii. p. 292, pi. 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, tapering to a fine point, 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 



