108 Mr. W. Clark on the Cbemnitzia. 



XIII. — Further Observations on the Chemnitziae. 

 By William Clark, Esq. 



To the Editors of the Annals of Natural History. 



Gentlemen, Exmouth, July 18, 1851. 



After the many admissions to the ' Annals ' I have lately been 

 favoured with, I would gladly have withdrawn for a moment 

 from the invasion of its pages, but an unexpected discovery, 

 which was so forlorn a hope, that even the Gods would hardly 

 have dared to promise the fulfilment of, having occurred, I am 

 irresistibly led to present myself again to your notice, lest I should 

 be guilty of a neglect to science, to the ' Annals,' and its readers. 

 I announce the discovery of one of, perhaps, the rarest of the 

 British Gasteropodan unrecorded molluscan animals, the shell of 

 which I found near thirty years ago at this place ; and my then 

 specimens, I believe, passed into Mr. Jeffreys' hands, but by some 

 strange omission this elegant object has until very lately remained 

 without a name ; the cause has perhaps been its anomalous aspect ; 

 as soon as I was aware of this circumstance I flew to the rescue 

 of my own discovery, and in the 'Annals,' vol. vi.p. 459, N. S., 

 I hazarded a conjecture of its position, and honoured my protege 

 with the name of a lady of distinguished science ; I need scarcely 

 say that the species I allude to is the Chemnitzia Gulsonce. This 

 rare creature was met with in the coralline zone of the South 

 Devon coast, at Exmouth, in thirteen fathoms water ; it remained 

 alive three days, and furnished me with the minutes I now sub- 

 mit. It is necessaiy to say, that my friend Mr. JefiVeys did not 

 concur with me in my opinion of the natural position of the ani- 

 mal, and announced his conflicting views in the ' Annals,' vol. vii. 

 p. 27, N. S. 



I also send descriptions of four other rare unrecorded Chem- 

 nitzia ; that on the C Sandvicensis being a continuation of the 

 paper in the 'Annals,' vol. vii. p. 388, N. S. 



Chemnitzia Gulsona, Clark. 



Animal inhabiting an elongated, slender, hyper-hyaline shell 

 of six rounded volutions, the body occupying half the axis, with 

 a large patulous, sinuated, and a little outwardly reflected aper- 

 ture, the peristome of which is entire ; the animal rarely pro- 

 trudes the eyes and tentacula ; the tip of the effete muzzle, the 

 mentum of authors, is only seen, and also a part of the foot, 

 which is so short as almost to allow of progression within the 

 aperture. The shell is of such hyaline purity as to give a full 

 view of the organs as if they were without that protection ; the 

 mantle is flake-white and even with the shell ; the neck is very 



