APPENDIX. 523 



CHEMNITZIA CONOIDEA. (P. 422.) 



The tentacula have moderately large, terminal, flake-white 

 inflations. The continuation of the upper part of the rostrum 

 with the neck is most apparent and cannot be mistaken, the 

 junction being only invaded by the span of the tentacula and 

 insertion of the eyes. The rostrum is slightly grooved from 

 the point of the emargination to the centre of the tentacular 

 veil, under which, just below the eyes, is the proboscidal 

 fissure. 



CHEMNITZIA RUFA. (P. 423.) 



The rostrum is spotted with small flake-white points, parti- 

 cularly on and between its grooved central lines. 



The eyes are on the bases of the short, broad, very little 

 folded, triangular tentacula, the tips of which are not decidedly 

 marked with the characteristic apical inflation. 



CHEMNITZIA SPIRALIS. (P. 425.) 



This is a review of the original notes ; there is little to add. 

 The rostrum, in quietude, shows an inflation on which the 

 proboscidal fissure may be detected, with the high power of a 

 Coddington lens, in certain lights; when in motion, it loses 

 the finely corrugated prominence, becomes attenuated in the 

 middle, and has a spatulate rounded termination that rarely, 

 when in action, simulates an emargination or hollo wing-out. 



CHEMNITZIA INTERSTINCTA. (P. 426.) 



With regard to the animal inhabiting the shell with flat 

 volutions, we have to add, that when the foot or the rostrum 

 is by excitement produced beyond the usual extent, it becomes 

 greatly hollowed out, and the auricular points increased in 

 length ; but this condition is common to all the Chemnitzia, 

 and when tranquillity is restored, the organs revert to the 

 form we have described. The animal is shy and sluggish, and 

 often marches with the eyes under the margin of the shell. 



Whether the tumid shell mentioned in our description of 



