143 
AURICULA incrassata. 
TAB. CLXIIL —Fig. 1, 2> and 3. 
Spec. Char. Ovate, ventricose, transversely suL 
cated, longitudinally striated ; spire short ; 
mouth angular above, with very thick lips ; 
columella three plaited. 
Syn. A. ringens. Parkinson iii. 84. p. b.f. 4. hut 
not of Lamarck. 
"VV hen full grown this is about half an inch long, and 
two-thirds as wide ; the outer lip is then much thickened 
for a considerable way back upon the last whorl, and this 
thickened part is marked by numerous lines of growth in 
place of the regular sulci ; while the shell is young the 
lip is only slightly reflected at the edge. The longitu- 
dinal striae only appear within the furrows, where they 
are elevated and sharp, dividing them into minute oblong 
rectangular cells, see fig. 3. 
Miss E. Hill havingpresented me with both young and 
old shells of this species from Blackdown, and Mr. De 
France having also forwarded to me a valuable collection 
of shells from the neighbourhood of Paris, containing 
Lamarck’s A. ringens, T am enabled to point out the in- 
correctness of Parkinson’s reference ; independently of 
the general form and difference of size ; the want of striae 
within the outer lip, and the presence of longitudinal 
striae upon the surface distinguish the British shell. 
AURICULA turgida. 
TAB. CLXIIL— Fig*. 4. 
Spec. Char. Ovate-acute, turgid, transversely 
striated, shining ; spire short, acute ; aper- 
ture oblong, with thickened lips; columella 
two plaited; outer lip smooth within, thickest 
in the middle. 
A minute glossy shell, rather more than a line long, 
varying in the thickness of its lips with its age. The 
spire is not quite so long as the mouth, which is con-. 
