TO GEOLOGY. 153 



Observations. It is with much hesitation I have con- 

 cluded to place this curious and truly interesting species 

 with the Fusi. It has some of the generic characters of 

 the Pyrula, Murex, and I think Monoceres ; for, if I mis- 

 take not, the furrow immediately below the last row of 

 spines, in perfect specimens, will be found to throw out a 

 process very like to that of the genus last mentioned. I 

 am induced to place it here from the example of Lam- 

 arck's Fusus minax, (Murex minax, Brander). Our shell 

 has a striking similarity to that species, and should stand 

 next to it wherever it may be placed. It is rather more 

 turbinated and has a thicker columella. It is placed at 

 the last of the Fusi, having a shorter and more oblique 

 canal than those above described. 



Of this widely spread genus fifteen species have been 

 observed in England, by Sowerby, and one by Konig. 

 Fourteen are in the London Clay, and two in the Crag.* 

 M. Deshayes in his Tertiary Tables gives one hundred 

 and eleven species. Forty-two of these are from the Paris 

 basin, and he gives eight to the English Crag. M. Brog- 

 niartf observed in the Formations of Vicentin five species. 



In this country Mr Say has described two species from 

 the Tertiary of Maryland, the quadricostatus and cinereus. 

 Mr Conrad discovered at St Mary's a new species, which 

 he described under the name of errans, but that name 

 being preoccupied, he subsequently changed it to rusticus. 



* Mineral Conch. t Terrains du Vicentin, p, 72, 



U 



