526 APPENDIX. 
usual, not more so than in C. Gulsone ; in these two species 
it may be termed sunken or subreflexed. 
CHEMNITZIA ACICULA.—(P. 439.) 
For the corresponding parts in the original notes, read, 
“ Rostrum considerably emarginate in the centre at its anteal 
termination, forming the angles of the cleft into two minute 
subrotund processes. The foot is long, often extending on 
the march to three volutions, and terminating behind in a © 
narrow, produced, lanceolate point. The front of the foot is 
square, but expands into rather sharp, auricular poimts, and is 
gradually constricted below them to the junction with the 
body”. 
CHEMNITZIA FENESTRATA.—(P. 440.) 
The neck on each side, as far as the tentacula, is marked 
with a pale lead-coloured stripe, of unequal breadth in its 
course, which is composed of a close union of very minute 
points, giving the narrow fillet a mottled aspect. A tinge of 
the same colour is also apparent on the basal portion of the 
tentacula and upper surface of the foot. In this species the 
rostrum is greatly thickened at its base, and with very high 
powers the proboscidal fissure may be seen; the terminal 
portion is much compressed, slightly funnel-shaped, and 
sometimes simulates a cochleariform depression. The apical 
flake-white tentacular inflations are very distinct. 
Movrex Ginannianus.—(P. 494.) 
Muovrex spracuystoma.—(P. 496.) 
The above so-called species have been the source of some 
controversy amongst naturalists, who have found it difficult to 
determine their distinctness. With us the “ Ginannianus” 
marches with the “ brachystoma ;’ the authors of the ‘ British 
Mollusca’ consider it a synonym of M. nebula. We have 
obtained some specimens of equal size, of our present species, 
which were deposited in the same glass, and, being lively and 
free, afforded for some howrs an excellent examination, which 
