444 PYEAMIDELLID^E. 



this simple acknowledgement of rare merit, lest I should 

 offend those retiring sensibilities, which are always the con- 

 comitants of true science. 



This elegant shell, of five and a half rather tumid volutions, 

 has much the contour of some of the subelongated species. I 

 felt little doubt that it was a true Cliemnitzia, and deposited 

 it in that genus until our knowledge of the animal should 

 determine its position. 



It is a rare species : I possess three perfect specimens. 

 The characteristic obtuse, yet reflexed apex, induced me to 

 place it amongst its congeners of similar apical configuration, 

 which is almost peculiar to the Pyramidellidce. I believe that 

 lanthina is the only other genus that has something of a 

 similar structure, but in it the apex presents rather a distorted 

 irregularity than a true reflexion ; but whether this be so or 

 not, the connecting characters between lanthina and Chem- 

 nitzia are of little value. 



Soon after the above description appeared in the ' Annals/ 

 I had to announce the unexpected discovery, which was so 

 forlorn a hope that even the Gods would hardly have dared 

 to promise its fulfilment, of perhaps one of the rarest of the 

 British Gasteropodan undescribed molluscan animals ; the 

 cause has perhaps been its anomalous aspect. This rare 

 creature was met with in the coralline zone of the South 

 Devon coast, at Exmouth, in 13 fathoms water ; it remained 

 alive three days, and furnished me with the minutes which 

 I now submit. 



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 

 aperture, the peristome of which is entire. The animal rarely 

 protrudes the eyes and tentacula. The tip only of the effete 

 muzzle is seen, and 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 long, cylindrical, 

 like that of the C. spiralis, and finely transversely corrugated, 



