526 APPENDIX. 



usual, not more so than in C. Gulsona ; 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 points, 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. 



MUREX GlNANNIANUS. (P. 494.) 



MUREX BRACHYSTOMA. (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 hours an excellent examination, which 



