.97 
AMPULLAR! A Ambulacrum, 
TAB. CCCLXXI1. 
Spec. Char. Globose, with a canal around an 
acute spire ; umbilicus plain within. 
otrongly resembling Ampullaria acuta (tab. 284 .) 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 round ness 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 Ilord 
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 defined, unless it ought to be included in Natica. 
