200 Mr. W. Clark on some of the Animals of the Chemnitzise. 



borne so close and straight as almost to hide the rostrum and 

 proboscidal fissure ; they may be tei-med small, short, ti-iangular, 

 and terminate each with two white inflations, that is, one com- 

 pletely apical, the other close below it quite lateral, subsemicir- 

 cular, and as if soldered to the external sides of the points. I do 

 not recollect having before observed this tentacular peculiarity. 

 The eyes are at the internal bases, not very close together. The 

 foot is a very deceptive organ, from its quality of exhibiting dif- 

 ferent appearances; it is very little concave in front, and has 

 long 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 

 operciilum. The animal is veiy active and free. Taken with the 

 Chem. acicula in the same locality. The animal of this species 

 has hitherto escaped observation. 



I stated in the 7th vol. of the 'Annals,' N. S. p. 391, that I 

 considered the Ch. clavula a variety of Ch. acicula, and confi- 

 dently predicted no animal would ever be discovered of such va- 

 riety which would exhibit decided specialties. I believe this 

 error has originated from having had varieties of the Ch. acicula 

 sent me for examination instead of the true ' clavula.' I appre- 

 hend 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 

 Ch. clavula proves, that as regards both the shell and animal it 

 is very distinct from Ch. acicula. 



Chemnitzia scalaris, Philippi. 

 Chemnitsia rufescens, auct. 



Animal subhyaline white, sometimes of a pale red muddy 

 brown, aspersed with minute opake snow-white points, inhabiting 

 a white plicated shell of seven or eight volutions, with transverse 

 striae between the ribs, having the body marked with two or 

 three narrow spiral light reddish brown bands, and two on the 

 penultimate volution ; the apex is intensely reflexed on its next 

 neighbour. Mantle even, except emitting a small cloven fold at 

 the upper angle of the aperture. Rostrum deeply notched in 

 front, with the segments gently arcuated. The tentacula are 

 moderately long, strong, and divergent, and exhibit the usual 

 folding auriform phases of their margins, but the varying infla- 

 tions of the tips are less developed than in many other species ; 

 the eyes are black, not very close together, and fixed at the in- 

 ternal bases of the tentacula, which do not entirely coalesce, 



