97 



AMPULLARIA Ambulacrum. 



TAB. CCCLXXIl. 



Spec. Char. Globose, with a canal around an 

 acute spire ; umbilicus plain within. 



k^TRONGLY reseinblini^ Amj)ullaria acuta (tab. 281.) but 

 well distinguished by the deep spiral canal around the 

 upper edge of the whorls : this canal is flat at the bottom 

 with nearly upright sides, resembling a trench cut round 

 a hill. It is distinguished from A. canaliculata of La- 

 marck, by the form of the canal, by the roundness of its 

 sides, and by the umbilicus not having a spiral groove 

 within it ; it also grows much larger. 



This species has been frequently sent me from Hord- 

 well, by Lady Burgoine, Miss Teed, Miss Dent, and 

 other kind Friends to the Science ; it has also been 

 found at Muddiford, whence the upper figure, by Lady 

 Burgoine, and at Stubbington by Mr. Holloway ; but I 

 have never met with a French specimen. 



The probability of this and the other shells from the 

 London clay stratum, classed under the Genus Ampul- 

 laria, being the exuviae of marine animals, is so great, 

 that it does not seem correct to arrange them with the 

 recent species ; they ought, as Lamarck has observed, to 

 form a distinct Genus, which it is to be hoped will soon 

 be deiined, unless it ought to be included in Natica. 



